syzbot

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BUG: KASAN: use-after-free in list_empty include/linux/list.h:292 [inline]
BUG: KASAN: use-after-free in gfs2_discard fs/gfs2/aops.c:618 [inline]
BUG: KASAN: use-after-free in gfs2_invalidate_folio+0x455/0xa70 fs/gfs2/aops.c:656
Read of size 8 at addr ffff88805980e1d8 by task syz-executor/4696

CPU: 0 PID: 4696 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 list_empty include/linux/list.h:292 [inline]
 gfs2_discard fs/gfs2/aops.c:618 [inline]
 gfs2_invalidate_folio+0x455/0xa70 fs/gfs2/aops.c:656
 folio_invalidate mm/truncate.c:158 [inline]
 truncate_cleanup_folio+0x218/0x5e0 mm/truncate.c:178
 truncate_inode_pages_range+0x237/0xff0 mm/truncate.c:368
 gfs2_evict_inode+0xab5/0x1170 fs/gfs2/super.c:1511
 evict+0x485/0x870 fs/inode.c:705
 dispose_list fs/inode.c:738 [inline]
 evict_inodes+0x604/0x690 fs/inode.c:792
 generic_shutdown_super+0x93/0x340 fs/super.c:480
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182
 task_work_run+0x1ca/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x93e/0x2400 kernel/exit.c:880
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 __do_sys_exit_group kernel/exit.c:1033 [inline]
 __se_sys_exit_group kernel/exit.c:1031 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fba81f8eec9
Code: Unable to access opcode bytes at 0x7fba81f8ee9f.
RSP: 002b:00007fff945582c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fba82011da2 RCX: 00007fba81f8eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 00007fff94556067 R09: 00007fff94559520
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff94559520
R13: 00007fba82011d7d R14: 00000000000268cc R15: 00007fff94559560
 </TASK>

Allocated by task 5764:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline]
 gfs2_trans_add_data+0x1fb/0x610 fs/gfs2/trans.c:209
 gfs2_unstuffer_page fs/gfs2/bmap.c:83 [inline]
 __gfs2_unstuff_inode fs/gfs2/bmap.c:121 [inline]
 gfs2_unstuff_dinode+0xf61/0x1770 fs/gfs2/bmap.c:168
 gfs2_iomap_begin_write fs/gfs2/bmap.c:1036 [inline]
 gfs2_iomap_begin+0x989/0x1340 fs/gfs2/bmap.c:1112
 iomap_iter+0x6c6/0x1040 fs/iomap/iter.c:91
 iomap_file_buffered_write+0x1b4/0x880 fs/iomap/buffered-io.c:846
 gfs2_file_buffered_write+0x4fe/0x880 fs/gfs2/file.c:1057
 gfs2_file_write_iter+0x42c/0xdf0 fs/gfs2/file.c:1158
 call_write_iter include/linux/fs.h:2265 [inline]
 aio_write+0x50e/0x720 fs/aio.c:1615
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x6aa/0x1300 fs/aio.c:2034
 __do_sys_io_submit fs/aio.c:2093 [inline]
 __se_sys_io_submit+0x190/0x300 fs/aio.c:2063
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 5764:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0xf7/0x290 mm/slub.c:3709
 trans_drain fs/gfs2/log.c:1023 [inline]
 gfs2_log_flush+0x1902/0x24e0 fs/gfs2/log.c:1161
 gfs2_jdata_writepages+0xf5/0x150 fs/gfs2/aops.c:392
 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491
 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 filemap_fdatawrite_range+0xca/0x120 mm/filemap.c:439
 gfs2_fsync+0xdb/0x340 fs/gfs2/file.c:747
 generic_write_sync include/linux/fs.h:2962 [inline]
 gfs2_file_write_iter+0xc60/0xdf0 fs/gfs2/file.c:1160
 call_write_iter include/linux/fs.h:2265 [inline]
 aio_write+0x50e/0x720 fs/aio.c:1615
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x6aa/0x1300 fs/aio.c:2034
 __do_sys_io_submit fs/aio.c:2093 [inline]
 __se_sys_io_submit+0x190/0x300 fs/aio.c:2063
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88805980e1c0
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 80-byte region [ffff88805980e1c0, ffff88805980e210)

The buggy address belongs to the physical page:
page:ffffea0001660380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5980e
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888140fd2b40
raw: 0000000000000000 0000000080240024 00000001ffffffff 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5711, tgid 5710 (syz.4.199), ts 157542156760, free_ts 157518313234
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
 alloc_slab_page+0x5d/0x160 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1997
 ___slab_alloc+0xbc6/0x1230 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline]
 gfs2_trans_add_meta+0x34e/0xc60 fs/gfs2/trans.c:250
 do_gfs2_set_flags fs/gfs2/file.c:264 [inline]
 gfs2_fileattr_set+0x7d9/0xa10 fs/gfs2/file.c:310
 vfs_fileattr_set+0x842/0xaf0 fs/ioctl.c:696
 ioctl_setflags fs/ioctl.c:728 [inline]
 do_vfs_ioctl+0x16c1/0x1d10 fs/ioctl.c:839
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
 tlb_batch_list_free mm/mmu_gather.c:75 [inline]
 tlb_finish_mmu+0x10c/0x1c0 mm/mmu_gather.c:364
 exit_mmap+0x343/0x8e0 mm/mmap.c:3262
 __mmput+0x118/0x3c0 kernel/fork.c:1200
 exit_mm+0x1e6/0x2c0 kernel/exit.c:565
 do_exit+0x8c1/0x2400 kernel/exit.c:867
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 __do_sys_exit_group kernel/exit.c:1033 [inline]
 __se_sys_exit_group kernel/exit.c:1031 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88805980e080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
 ffff88805980e100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
>ffff88805980e180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
                                                    ^
 ffff88805980e200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
 ffff88805980e280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
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