bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6
building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa
testing commit 31acccdc877486a649a86d37725a15175fcd5ed6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 5d9abc7c96317f8c4a89343bc3d59ebb9fdfae8ae4e49d3853dea12226e7c102
all runs: crashed: kernel BUG in dnotify_free_mark
testing current HEAD b172b44fcb1771e083aad806fa96f3f60e2ddfac
testing commit b172b44fcb1771e083aad806fa96f3f60e2ddfac
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 986031685840014a705505c79662fecd93c089fb3011a1e3d3ed0f83e9828a79
all runs: crashed: kernel BUG in dnotify_free_mark
revisions tested: 2, total time: 29m23.520299114s (build: 21m52.197978406s, test: 6m51.239825048s)
the crash still happens on HEAD
commit msg: Linux 4.19.206
crash: kernel BUG in dnotify_free_mark
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
kernel BUG at fs/notify/dnotify/dnotify.c:132!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9113 Comm: kworker/u4:7 Not tainted 4.19.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
RIP: 0010:dnotify_free_mark fs/notify/dnotify/dnotify.c:132 [inline]
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:126
Code: 78 48 89 fa 48 89 e5 48 83 ec 08 48 c1 ea 03 80 3c 02 00 75 17 48 83 7e 78 00 75 0e 48 8b 3d 1c 70 15 09 e8 57 3b e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 8a 74 e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
RSP: 0018:ffff8881edfffc68 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881eed1c5c0 RCX: 1ffff1103b9ff76b
RDX: 1ffff1103b9ff777 RSI: ffff8881dcffbb40 RDI: ffff8881dcffbbb8
RBP: ffff8881edfffc70 R08: ffff8881edfffcf0 R09: 1ffff1103dbfff9f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881dcffbb40
R13: ffffffff88142f80 R14: dffffc0000000000 R15: ffff8881dcffbb40
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd00146c60 CR3: 000000000986d005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fsnotify_final_mark_destroy+0x6d/0xa0 fs/notify/mark.c:213
 fsnotify_mark_destroy_workfn+0x1d7/0x390 fs/notify/mark.c:799
 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
---[ end trace 2e262e826fecef72 ]---
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
RIP: 0010:dnotify_free_mark fs/notify/dnotify/dnotify.c:132 [inline]
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:126
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
Code: 78 48 89 fa 48 89 e5 48 83 ec 08 48 c1 ea 03 80 3c 02 00 75 17 48 83 7e 78 00 75 0e 48 8b 3d 1c 70 15 09 e8 57 3b e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 8a 74 e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
RSP: 0018:ffff8881edfffc68 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881eed1c5c0 RCX: 1ffff1103b9ff76b
RDX: 1ffff1103b9ff777 RSI: ffff8881dcffbb40 RDI: ffff8881dcffbbb8
RBP: ffff8881edfffc70 R08: ffff8881edfffcf0 R09: 1ffff1103dbfff9f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881dcffbb40
R13: ffffffff88142f80 R14: dffffc0000000000 R15: ffff8881dcffbb40
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000055c071 CR3: 000000000986d002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400