CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f3fefeff700 GSBase=ffff8880ba500000 TRBase=fffffe0000034000
GDTBase=fffffe0000032000 IDTBase=fffffe0000000000
vhci_hcd: connection closed
CR0=0000000080050033 CR3=00000000548d9000 CR4=00000000001426e0
BUG: unable to handle kernel NULL pointer dereference at 000000000000001c
Sysenter RSP=fffffe0000034000 CS:RIP=0010:ffffffff87401690
IP: atomic_inc arch/x86/include/asm/atomic.h:92 [inline]
IP: kthread_stop+0x47/0x640 kernel/kthread.c:525
PGD a03a9067 P4D a03a9067 PUD a03aa067 
EFER = 0x0000000000000d01  PAT = 0x0407050600070106
PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.211-syzkaller #0
*** Control State ***
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usbip_event event_handler
task: ffff8880b55ee5c0 task.stack: ffff8880b55f8000
RIP: 0010:atomic_inc arch/x86/include/asm/atomic.h:92 [inline]
RIP: 0010:kthread_stop+0x47/0x640 kernel/kthread.c:525
RSP: 0018:ffff8880b55ffc70 EFLAGS: 00010297
PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000e2
RAX: ffff8880b55ee5c0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000286
RBP: fffffffffffffffc R08: ffffffff8b9919d8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888237dec918
R13: ffff888237dec908 R14: fffffbfff1924130 R15: ffffffff89857e20
EntryControls=0000d1ff ExitControls=002fefff
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000001c CR3: 00000000a03a8000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vhci_shutdown_connection+0x12a/0x240 drivers/usb/usbip/vhci_hcd.c:1035
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
 event_handler+0x1c3/0x4a0 drivers/usb/usbip/usbip_event.c:92
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
        reason=80000021 qualification=0000000000000000
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
IDTVectoring: info=00000000 errcode=00000000
Code: 00 65 8b 1d bc 17 
TSC Offset = 0xfffffef59235f681
c9 7e 83 fb 07 0f 87 5b 04 00 00 e8 be d5 1e 00 89 db 48 0f a3 1d 8c 42 d0 08 0f 82 a2 03 00 
EPT pointer = 0x000000009c18c01e
00 e8 a9 d5 1e 00 <f0> ff 45 20 48 8d 
Virtual processor ID = 0x0001
7d 24 48 b8 00 00 00 00 00 fc ff df 48 89 fa 
RIP: atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RSP: ffff8880b55ffc70
RIP: kthread_stop+0x47/0x640 kernel/kthread.c:525 RSP: ffff8880b55ffc70
CR2: 000000000000001c
---[ end trace 63bb3a88ae0cb3d1 ]---