bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8
building syzkaller on 18e33098d58c8738cc3b678346141b74d34d4e30
testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 with gcc (GCC) 8.1.0
kernel signature: 53c3554411065bcb9284b6f412fa4c5940e4c910c86d04cef3adb93970b1cd8f
all runs: crashed: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
testing current HEAD 87335852c5d9ec629f80bb2257b9a9945962b719
testing commit 87335852c5d9ec629f80bb2257b9a9945962b719 with gcc (GCC) 8.1.0
kernel signature: 72d3ad2465c69f0054963e03b246e3de5a0c04b9e21442b573d9e4ff2bdc5c50
all runs: crashed: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
revisions tested: 2, total time: 29m3.8596245s (build: 22m48.761352634s, test: 5m41.328225279s)
the crash still happens on HEAD
commit msg: Linux 4.14.209
crash: kernel BUG at fs/notify/dnotify/dnotify.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
------------[ cut here ]------------
kernel BUG at fs/notify/dnotify/dnotify.c:131!
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!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Modules linked in:
CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.209-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
task: ffff8881f4df05c0 task.stack: ffff8881f4df8000
RIP: 0010:dnotify_free_mark+0x3b/0x50 fs/notify/dnotify/dnotify.c:131
RSP: 0018:ffff8881f4dffc70 EFLAGS: 00010282
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RAX: dffffc0000000000 RBX: ffff8881ef2bb500 RCX: 1ffff1103d94336b
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
RDX: 1ffff1103d943377 RSI: ffff8881eca19b40 RDI: ffff8881eca19bb8
RBP: ffff8881f4dffc78 R08: ffff8881f4dffcf8 R09: 1ffff1103e9bffa0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881eca19b40
R13: ffffffff87938360 R14: dffffc0000000000 R15: ffff8881eca19b40
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffe755fff8 CR3: 0000000008e6a004 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
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 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
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
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 54 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
45 72 08 e8 47 98 e9 ff c9 c3 <0f> 0b 48 89 75 f8 e8 7a ce 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: ffff8881f4dffc70
---[ end trace 098585a40aa401df ]---
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready