bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8
building syzkaller on 18e33098d58c8738cc3b678346141b74d34d4e30
testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 with gcc (GCC) 8.4.1 20210217
kernel signature: 04e0a623346a3a97aba7e8995e5897288158e1cbd59211c755caa2dea0e7885d
all runs: crashed: kernel BUG in dnotify_free_mark
testing current HEAD 7d7d1c0ab3eb7c8d8f63a126535018007823b207
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: 6c5077c92320a8848a58260c16ce297c6598eeca0cd37d4baa4d6c265c6793e0
all runs: crashed: kernel BUG in dnotify_free_mark
revisions tested: 2, total time: 25m43.711871244s (build: 18m40.520700332s, test: 6m39.046816338s)
the crash still happens on HEAD
commit msg: Linux 4.14.232
crash: kernel BUG in dnotify_free_mark
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
kernel BUG at fs/notify/dnotify/dnotify.c:131!
IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
task: ffff8881f5316140 task.stack: ffff8881f5328000
RIP: 0010:dnotify_free_mark fs/notify/dnotify/dnotify.c:131 [inline]
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:125
RSP: 0018:ffff8881f532fc70 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881ef2d2cc0 RCX: 1ffff1103d9cdf6b
RDX: 1ffff1103d9cdf77 RSI: ffff8881ece6fb40 RDI: ffff8881ece6fbb8
RBP: ffff8881f532fc78 R08: ffff8881f532fcf8 R09: 1ffff1103ea65fa0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ece6fb40
R13: ffffffff87938820 R14: dffffc0000000000 R15: ffff8881ece6fb40
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2371e25740 CR3: 0000000008e6a003 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fsnotify_final_mark_destroy+0x72/0xa0 fs/notify/mark.c:192
 fsnotify_mark_destroy_workfn+0x1cf/0x370 fs/notify/mark.c:761
 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: c7 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 94 a4 74 08 e8 07 99 e9 ff c9 c3 <0f> 0b 48 89 75 f8 e8 ea ce e9 ff 48 8b 75 f8 eb da 0f 1f 40 00 
RIP: dnotify_free_mark fs/notify/dnotify/dnotify.c:131 [inline] RSP: ffff8881f532fc70
RIP: dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:125 RSP: ffff8881f532fc70
---[ end trace 8dbe53ad785ea42b ]---