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SubjectWARNING in __fsnotify_recalc_mask

syzbot found the following crash on:

HEAD commit: 1f7a4c73a739 Merge tag '9p-for-4.19-2' of git://
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:

IMPORTANT: if you fix the bug, please add the following tag to the commit:

IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
WARNING: CPU: 1 PID: 12015 at fs/notify/mark.c:139
__fsnotify_recalc_mask+0x2d7/0x350 fs/notify/mark.c:139
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 12015 Comm: syz-executor0 Not tainted 4.18.0+ #195
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:__fsnotify_recalc_mask+0x2d7/0x350 fs/notify/mark.c:139
Code: 90 00 00 00 48 83 c4 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 eb 2d a2
ff 49 83 ec 04 eb 82 e8 e0 2d a2 ff 0f 0b e8 d9 2d a2 ff <0f> 0b eb a5 e8
60 24 e1 ff e9 11 ff ff ff 48 89 df e8 f3 24 e1 ff
RSP: 0018:ffff8801b509f5c8 EFLAGS: 00010293
RAX: ffff8801b2c0a180 RBX: 0000000000000002 RCX: ffffffff81dabc96
RDX: 0000000000000000 RSI: ffffffff81dabd67 RDI: 0000000000000005
RBP: ffff8801b509f658 R08: ffff8801b2c0a180 R09: ffffed00398cb796
R10: ffffed00398cb796 R11: ffff8801cc65bcb3 R12: dffffc0000000000
R13: ffff8801cc65bcb0 R14: 0000000000000000 R15: 0000000000000000
fsnotify_put_mark+0x523/0xab0 fs/notify/mark.c:240
fsnotify_destroy_marks+0x2d1/0x5c0 fs/notify/mark.c:741
fsnotify_clear_marks_by_inode fs/notify/fsnotify.h:39 [inline]
__fsnotify_inode_delete+0x19/0x20 fs/notify/fsnotify.c:35
fsnotify_inoderemove include/linux/fsnotify.h:136 [inline]
dentry_unlink_inode+0x48b/0x5e0 fs/dcache.c:370
__dentry_kill+0x44c/0x7a0 fs/dcache.c:566
dentry_kill+0xc9/0x5a0 fs/dcache.c:685
dput.part.26+0x66b/0x7a0 fs/dcache.c:846
dput+0x15/0x20 fs/dcache.c:828
__fput+0x4c2/0x860 fs/file_table.c:264
____fput+0x15/0x20 fs/file_table.c:282
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcfa3e50c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000021
RAX: 000000000000000a RBX: 00007fcfa3e516d4 RCX: 0000000000457089
RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000008
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cb6d0 R14: 00000000004c31f3 R15: 0000000000000000
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

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