bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6
building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa
testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.4.1 20210217
kernel signature: 85df8f0fc67278163e9603c7c6a89b0a119f2ceba57a8a5a855d0ae790f5a97a
all runs: crashed: kernel BUG in dnotify_free_mark
testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b
testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217
kernel signature: 7f3967766e2602daead7323c66b0bfa0f17185e60f1e47f94532de80066d8649
all runs: crashed: kernel BUG in dnotify_free_mark
revisions tested: 2, total time: 26m38.988459439s (build: 19m34.142404456s, test: 6m33.420140628s)
the crash still happens on HEAD
commit msg: Linux 4.19.195
crash: kernel BUG in dnotify_free_mark
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
------------[ cut here ]------------
kernel BUG at fs/notify/dnotify/dnotify.c:132!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
ieee80211 phy14: Selected rate control algorithm 'minstrel_ht'
CPU: 1 PID: 1025 Comm: kworker/u4:4 Not tainted 4.19.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
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 24 5b 15 09 e8 d7 1f e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 0a 59 e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
RSP: 0018:ffff8881f3377c68 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881ef29a840 RCX: 1ffff1103dbc2d6b
RDX: 1ffff1103dbc2d77 RSI: ffff8881ede16b40 RDI: ffff8881ede16bb8
RBP: ffff8881f3377c70 R08: ffff8881f3377cf0 R09: 1ffff1103e66ef9f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ede16b40
R13: ffffffff88142d80 R14: dffffc0000000000 R15: ffff8881ede16b40
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c02cf4710 CR3: 000000000986d003 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
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 7de82cf3e348cc99 ]---
ieee80211 phy15: Selected rate control algorithm 'minstrel_ht'
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
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
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 24 5b 15 09 e8 d7 1f e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 0a 59 e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
RSP: 0018:ffff8881f3377c68 EFLAGS: 00010282
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
RAX: dffffc0000000000 RBX: ffff8881ef29a840 RCX: 1ffff1103dbc2d6b
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
RDX: 1ffff1103dbc2d77 RSI: ffff8881ede16b40 RDI: ffff8881ede16bb8
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
RBP: ffff8881f3377c70 R08: ffff8881f3377cf0 R09: 1ffff1103e66ef9f
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ede16b40
R13: ffffffff88142d80 R14: dffffc0000000000 R15: ffff8881ede16b40
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcdfe2d1a0 CR3: 000000000986d005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400