================================================================== 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+0x40b/0x750 fs/gfs2/aops.c:627 Read of size 8 at addr ffff888056fc5c58 by task syz-executor/7751 CPU: 0 UID: 0 PID: 7751 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 list_empty include/linux/list.h:381 [inline] gfs2_discard fs/gfs2/aops.c:589 [inline] gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:627 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xd90 mm/truncate.c:404 gfs2_evict_inode+0x87a/0x1000 fs/gfs2/super.c:1428 evict+0x5f4/0xae0 fs/inode.c:837 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1764 [inline] gfs2_kill_sb+0x2bc/0x430 fs/gfs2/ops_fstype.c:1790 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1317 task_work_run+0x1d4/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6bd/0x2300 kernel/exit.c:970 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111 __do_sys_exit_group kernel/exit.c:1122 [inline] __se_sys_exit_group kernel/exit.c:1120 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1120 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3c96f8f6c9 Code: Unable to access opcode bytes at 0x7f3c96f8f69f. RSP: 002b:00007ffdc0ecd3e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f3c97011da2 RCX: 00007f3c96f8f6c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007ffdc0ecb187 R09: 00007ffdc0ece640 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc0ece640 R13: 00007f3c97011d7d R14: 00000000000406f3 R15: 00007ffdc0ece680 Allocated by task 8409: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4982 [inline] slab_alloc_node mm/slub.c:5292 [inline] kmem_cache_alloc_noprof+0x37d/0x700 mm/slub.c:5299 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:214 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:251 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1077 [inline] iomap_file_buffered_write+0x5b2/0x9c0 fs/iomap/buffered-io.c:1128 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x775/0x1430 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x320 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 8409: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2547 [inline] slab_free mm/slub.c:6642 [inline] kmem_cache_free+0x19b/0x690 mm/slub.c:6752 trans_drain fs/gfs2/log.c:1015 [inline] gfs2_log_flush+0x17a2/0x24c0 fs/gfs2/log.c:1153 gfs2_jdata_writepages+0xf9/0x150 fs/gfs2/aops.c:370 do_writepages+0x32e/0x550 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x1a5/0x250 mm/filemap.c:412 gfs2_fsync+0xd8/0x370 fs/gfs2/file.c:752 generic_write_sync include/linux/fs.h:2638 [inline] gfs2_file_write_iter+0xeb7/0x1100 fs/gfs2/file.c:1168 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x775/0x1430 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x320 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888056fc5c40 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff888056fc5c40, ffff888056fc5c90) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56fc5 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888143ef6b40 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 8348, tgid 8347 (syz.7.532), ts 263649097930, free_ts 205009072066 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5209 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3063 [inline] allocate_slab+0x96/0x350 mm/slub.c:3236 new_slab mm/slub.c:3290 [inline] ___slab_alloc+0xf56/0x1990 mm/slub.c:4659 __slab_alloc+0x65/0x100 mm/slub.c:4782 __slab_alloc_node mm/slub.c:4858 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_noprof+0x40f/0x700 mm/slub.c:5299 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:214 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:251 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1077 [inline] iomap_file_buffered_write+0x5b2/0x9c0 fs/iomap/buffered-io.c:1128 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 page last free pid 5943 tgid 5943 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948 kasan_depopulate_vmalloc_pte+0x6d/0x90 mm/kasan/shadow.c:484 apply_to_pte_range mm/memory.c:3190 [inline] apply_to_pmd_range mm/memory.c:3234 [inline] apply_to_pud_range mm/memory.c:3270 [inline] apply_to_p4d_range mm/memory.c:3306 [inline] __apply_to_page_range+0xb66/0x13d0 mm/memory.c:3342 __kasan_release_vmalloc+0xa2/0xd0 mm/kasan/shadow.c:602 kasan_release_vmalloc include/linux/kasan.h:592 [inline] kasan_release_vmalloc_node mm/vmalloc.c:2282 [inline] purge_vmap_node+0x214/0x8f0 mm/vmalloc.c:2299 __purge_vmap_area_lazy+0x7a4/0xb40 mm/vmalloc.c:2389 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2423 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3350 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888056fc5b00: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ffff888056fc5b80: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb >ffff888056fc5c00: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff888056fc5c80: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056fc5d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================