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Subject[syzbot] kernel BUG in dnotify_free_mark
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Hello,

syzbot found the following issue on:

HEAD commit: 247f34f7b803 Linux 6.1-rc2
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=157f594a880000
kernel config: https://syzkaller.appspot.com/x/.config?x=1d3548a4365ba17d
dashboard link: https://syzkaller.appspot.com/bug?extid=06cc05ddc896f12b7ec5
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15585936880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ec85ba880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a5f39164dea4/disk-247f34f7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8d1b92f5a01f/vmlinux-247f34f7.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1a4d2943796c/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+06cc05ddc896f12b7ec5@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/notify/dnotify/dnotify.c:136!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 56 Comm: kworker/u4:4 Not tainted 6.1.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: events_unbound fsnotify_mark_destroy_workfn
RIP: 0010:dnotify_free_mark+0x53/0x60 fs/notify/dnotify/dnotify.c:136
Code: 48 89 df e8 ff b3 dd ff 48 83 3b 00 75 17 e8 e4 bc 89 ff 48 8b 3d 4d ce 0f 0c 4c 89 f6 5b 41 5e e9 a2 de dc ff e8 cd bc 89 ff <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90001577b68 EFLAGS: 00010293
RAX: ffffffff81fe1253 RBX: ffff888075d2b080 RCX: ffff888018d40000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888075d2b000
RBP: ffffc90001577c30 R08: dffffc0000000000 R09: fffffbfff2325fe4
R10: fffffbfff2325fe4 R11: 1ffffffff2325fe3 R12: ffff888145e77800
R13: ffffc90001577bc0 R14: ffff888075d2b000 R15: ffff888075d2b000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f127cdcaa38 CR3: 000000001dd46000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
fsnotify_final_mark_destroy fs/notify/mark.c:278 [inline]
fsnotify_mark_destroy_workfn+0x2cc/0x340 fs/notify/mark.c:902
process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dnotify_free_mark+0x53/0x60 fs/notify/dnotify/dnotify.c:136
Code: 48 89 df e8 ff b3 dd ff 48 83 3b 00 75 17 e8 e4 bc 89 ff 48 8b 3d 4d ce 0f 0c 4c 89 f6 5b 41 5e e9 a2 de dc ff e8 cd bc 89 ff <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90001577b68 EFLAGS: 00010293
RAX: ffffffff81fe1253 RBX: ffff888075d2b080 RCX: ffff888018d40000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888075d2b000
RBP: ffffc90001577c30 R08: dffffc0000000000 R09


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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