bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6
building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa
testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.1.0
kernel signature: 1357cca22f3ce701fda7e43ca4a8f8b1392136f0cead28ece880973c9410f85d
all runs: crashed: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0
kernel signature: a796d4a686d7fcbb855dd570f07a78c6f0567beba7bc17a3ababaaba5f590b7f
all runs: crashed: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
revisions tested: 2, total time: 28m10.520162625s (build: 21m29.609189387s, test: 5m56.089663364s)
the crash still happens on HEAD
commit msg: Linux 4.19.163
crash: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
------------[ cut here ]------------
kernel BUG at fs/notify/dnotify/dnotify.c:132!
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 54 Comm: kworker/u4:2 Not tainted 4.19.163-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+0x3b/0x50 fs/notify/dnotify/dnotify.c:132
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 64 e7 12 09 e8 d7 05 e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 ba 3f e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
RSP: 0018:ffff8881f4e47c68 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881ef2efac0 RCX: 1ffff1103abd5f6b
RDX: 1ffff1103abd5f77 RSI: ffff8881d5eafb40 RDI: ffff8881d5eafbb8
RBP: ffff8881f4e47c70 R08: ffff8881d5eaf910 R09: 1ffff1103abd5f23
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d5eafb40
R13: ffffffff88142b40 R14: dffffc0000000000 R15: ffff8881d5eafb40
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff3b0cfa20 CR3: 000000000986d005 CR4: 00000000001606f0
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:2155
 worker_thread+0x85/0xb60 kernel/workqueue.c:2298
 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_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
---[ end trace 75befc8825f5d47f ]---
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:132
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 64 e7 12 09 e8 d7 05 e7 ff c9 c3 <0f> 0b 48 89 75 f8 e8 ba 3f e7 ff 48 8b 75 f8 eb da 0f 1f 40 00 55
ieee80211 phy14: Selected rate control algorithm 'minstrel_ht'
RSP: 0018:ffff8881f4e47c68 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881ef2efac0 RCX: 1ffff1103abd5f6b
RDX: 1ffff1103abd5f77 RSI: ffff8881d5eafb40 RDI: ffff8881d5eafbb8
RBP: ffff8881f4e47c70 R08: ffff8881d5eaf910 R09: 1ffff1103abd5f23
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d5eafb40
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
R13: ffffffff88142b40 R14: dffffc0000000000 R15: ffff8881d5eafb40
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
CR2: 00007fff3b0cfa20 CR3: 000000000986d005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
ieee80211 phy15: Selected rate control algorithm 'minstrel_ht'
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50