bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8
building syzkaller on 18e33098d58c8738cc3b678346141b74d34d4e30
testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 with gcc (GCC) 8.1.0
kernel signature: 9a76480e08eeda27abfb5f5e0a23ee9d3765a4850d92aea20251a17ea3f32e57
all runs: crashed: kernel BUG in dnotify_free_mark
testing current HEAD 2d2791fce891fc20709232d49a6bae075b9a77f8
testing commit 2d2791fce891fc20709232d49a6bae075b9a77f8 with gcc (GCC) 8.1.0
kernel signature: e33d084392b114555231777578e77b4fbe94eb94b0c6be9696595d10a42e7f81
all runs: crashed: kernel BUG in dnotify_free_mark
revisions tested: 2, total time: 24m52.766233356s (build: 18m29.914145123s, test: 5m35.290748122s)
the crash still happens on HEAD
commit msg: Linux 4.14.217
crash: kernel BUG in dnotify_free_mark
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
------------[ cut here ]------------
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
kernel BUG at fs/notify/dnotify/dnotify.c:131!
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
Modules linked in:
CPU: 1 PID: 2881 Comm: kworker/u4:4 Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
task: ffff8881e8fac6c0 task.stack: ffff8881e8828000
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:131
RSP: 0018:ffff8881e882fc70 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff8881ef2c9cc0 RCX: 1ffff1103d049f6b
RDX: 1ffff1103d049f77 RSI: ffff8881e824fb40 RDI: ffff8881e824fbb8
RBP: ffff8881e882fc78 R08: ffff8881e882fcf8 R09: 1ffff1103d105fa0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881e824fb40
R13: ffffffff87938820 R14: dffffc0000000000 R15: ffff8881e824fb40
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc75108f710 CR3: 0000000008e6a003 CR4: 00000000001606e0
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
batman_adv: batadv0: Interface activated: batadv_slave_0
 worker_thread+0xcc/0xed0 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 bc 74 08 e8 b7 a8 e9 ff c9 c3 <0f> 0b 48 89 75 f8 e8 9a de e9 ff 48 8b 75 f8 eb da 0f 1f 40 00 
RIP: dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:131 RSP: ffff8881e882fc70
---[ end trace 68d5bb50c7886135 ]---
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready