kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.9.123-g8dd3fc2 #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
task: ffff8801d9aec800 task.stack: ffff8801d9408000
RIP: 0010:[<ffffffff81238e8b>]  [<ffffffff81238e8b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
RSP: 0018:ffff8801d940f8e0  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018
RBP: ffff8801d940fa90 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8801d9aec800 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000018 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae10c98518 CR3: 00000001d501b000 CR4: 00000000001606f0
Stack:
 ffffffff85619280 ffff8801d940f920 ffffffff81232990 0000000000000002
 0000000000000002 ffff8801d9aec800 ffffffff85619280 dffffc0000000000
 ffff8801d940fae0 ffffffff8123acd9 05cea30587d0a6f4 fffffbfff0b72928
Call Trace:
 [<ffffffff8123cf50>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff83a01bde>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff83a01bde>] _raw_spin_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:159
 [<ffffffff839ca82a>] p9_conn_cancel+0xaa/0x4c0 net/9p/trans_fd.c:201
 [<ffffffff839cb192>] p9_poll_mux net/9p/trans_fd.c:630 [inline]
 [<ffffffff839cb192>] p9_poll_workfn+0x222/0x330 net/9p/trans_fd.c:1097
 [<ffffffff8118f461>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff81190256>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01e5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 25 28 00 00 00 0f 85 17 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 51 27 00 00 49 81 3e 60 ac e9 84 0f 84 08 f7 
RIP  [<ffffffff81238e8b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
 RSP <ffff8801d940f8e0>
---[ end trace b118a9fd529f5fc4 ]---