==================================================================
BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:381 [inline]
BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:589 [inline]
BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x72d/0x840 fs/gfs2/aops.c:627
Read of size 8 at addr ffff888048e6a248 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 list_empty include/linux/list.h:381 [inline]
 gfs2_discard fs/gfs2/aops.c:589 [inline]
 gfs2_invalidate_folio+0x72d/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1ba/0x200 lib/list_debug.c:49
Read of size 8 at addr ffff888048e6a250 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1ba/0x200 lib/list_debug.c:49
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x2ae/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 32 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1c7/0x200 lib/list_debug.c:50
Read of size 8 at addr ffff888048e6a248 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1c7/0x200 lib/list_debug.c:50
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x2ae/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1d4/0x200 lib/list_debug.c:62
Read of size 8 at addr ffff888048e6a248 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1d4/0x200 lib/list_debug.c:62
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x2ae/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x1e1/0x200 lib/list_debug.c:65
Read of size 8 at addr ffff888048e6a250 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x1e1/0x200 lib/list_debug.c:65
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x2ae/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 32 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry include/linux/list.h:226 [inline]
BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:295 [inline]
BUG: KASAN: slab-use-after-free in gfs2_remove_from_journal+0x834/0x8a0 fs/gfs2/meta_io.c:352
Read of size 8 at addr ffff888048e6a248 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry include/linux/list.h:226 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x834/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry include/linux/list.h:226 [inline]
BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:295 [inline]
BUG: KASAN: slab-use-after-free in gfs2_remove_from_journal+0x81d/0x8a0 fs/gfs2/meta_io.c:352
Read of size 8 at addr ffff888048e6a250 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del_entry include/linux/list.h:226 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x81d/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 32 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_del include/linux/list.h:203 [inline]
BUG: KASAN: slab-use-after-free in __list_del_entry include/linux/list.h:226 [inline]
BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:295 [inline]
BUG: KASAN: slab-use-after-free in gfs2_remove_from_journal+0x7f7/0x8a0 fs/gfs2/meta_io.c:352
Write of size 8 at addr ffff888048e6a250 by task syz-executor/5839

CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __list_del include/linux/list.h:203 [inline]
 __list_del_entry include/linux/list.h:226 [inline]
 list_del_init include/linux/list.h:295 [inline]
 gfs2_remove_from_journal+0x7f7/0x8a0 fs/gfs2/meta_io.c:352
 gfs2_discard fs/gfs2/aops.c:593 [inline]
 gfs2_invalidate_folio+0x333/0x840 fs/gfs2/aops.c:627
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0x2f6/0x490 mm/truncate.c:160
 truncate_inode_pages_range+0x255/0xe40 mm/truncate.c:404
 gfs2_evict_inode+0x71c/0x1a30 fs/gfs2/super.c:1426
 evict+0x3c2/0xad0 fs/inode.c:837
 iput_final fs/inode.c:1951 [inline]
 iput.part.0+0x621/0x1190 fs/inode.c:2003
 iput+0x35/0x40 fs/inode.c:1966
 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline]
 gfs2_kill_sb+0x40e/0x590 fs/gfs2/ops_fstype.c:1786
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
 deactivate_super fs/super.c:507 [inline]
 deactivate_super+0xde/0x100 fs/super.c:503
 cleanup_mnt+0x225/0x450 fs/namespace.c:1318
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 __do_sys_exit_group kernel/exit.c:1123 [inline]
 __se_sys_exit_group kernel/exit.c:1121 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121
 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac5f8f749
Code: Unable to access opcode bytes at 0x7fdac5f8f71f.
RSP: 002b:00007ffdf8be8b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdac6013da2 RCX: 00007fdac5f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007ffdf8be6937 R09: 00007ffdf8be9df0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf8be9df0
R13: 00007fdac6013d7d R14: 000000000005c21c R15: 00007ffdf8be9e30
 </TASK>

Allocated by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_data+0x4b2/0x7f0 fs/gfs2/trans.c:214
 gfs2_trans_add_databufs+0x12e/0x1b0 fs/gfs2/trans.c:251
 gfs2_iomap_put_folio+0x3d8/0x490 fs/gfs2/bmap.c:995
 __iomap_put_folio.isra.0+0x64/0x140 fs/iomap/buffered-io.c:869
 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline]
 iomap_file_buffered_write+0x61f/0xab0 fs/iomap/buffered-io.c:1188
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 11353:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
 trans_drain fs/gfs2/log.c:1015 [inline]
 gfs2_log_flush+0xacb/0x2550 fs/gfs2/log.c:1153
 gfs2_jdata_writepages+0x12a/0x170 fs/gfs2/aops.c:370
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 filemap_writeback+0x225/0x2d0 mm/filemap.c:387
 gfs2_fsync+0x1f8/0x390 fs/gfs2/file.c:752
 vfs_fsync_range+0x142/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xc18/0x11a0 fs/gfs2/file.c:1168
 aio_write+0x3b9/0x910 fs/aio.c:1634
 __io_submit_one fs/aio.c:2006 [inline]
 io_submit_one+0x1243/0x1e70 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit fs/aio.c:2082 [inline]
 __x64_sys_io_submit+0x1a9/0x370 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048e6a230
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 32 bytes inside of
 freed 80-byte region [ffff888048e6a230, ffff888048e6a280)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48e6a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801d3ea3c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 11311, tgid 11310 (syz.3.1953), ts 376759457144, free_ts 376737511174
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline]
 gfs2_trans_add_meta+0x87a/0xd20 fs/gfs2/trans.c:276
 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline]
 gfs2_alloc_blocks+0x46b/0x19c0 fs/gfs2/rgrp.c:2447
 alloc_dinode fs/gfs2/inode.c:436 [inline]
 gfs2_create_inode+0x199e/0x34a0 fs/gfs2/inode.c:822
 gfs2_atomic_open+0xb9/0x210 fs/gfs2/inode.c:1402
 atomic_open fs/namei.c:4295 [inline]
 lookup_open.isra.0+0x844/0x1780 fs/namei.c:4406
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0xa95/0x3140 fs/namei.c:4784
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 do_sys_openat2+0x121/0x290 fs/open.c:1430
page last free pid 11352 tgid 11351 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 tlb_batch_list_free mm/mmu_gather.c:159 [inline]
 tlb_finish_mmu+0x237/0x7c0 mm/mmu_gather.c:500
 exit_mmap+0x3f9/0xb60 mm/mmap.c:1290
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7d7/0x2bd0 kernel/exit.c:959
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888048e6a100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff888048e6a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888048e6a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888048e6a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff888048e6a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================