------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(l->owner)
WARNING: ./include/linux/local_lock_internal.h:47 at local_lock_acquire include/linux/local_lock_internal.h:47 [inline], CPU#0: napi/gre0-0/8758
WARNING: ./include/linux/local_lock_internal.h:47 at gro_cell_poll+0x5aa/0x6c0 net/core/gro_cells.c:66, CPU#0: napi/gre0-0/8758
Modules linked in:
CPU: 0 UID: 0 PID: 8758 Comm: napi/gre0-0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:local_lock_acquire include/linux/local_lock_internal.h:47 [inline]
RIP: 0010:gro_cell_poll+0x5b1/0x6c0 net/core/gro_cells.c:66
Code: 8d 3d c3 3a 99 08 48 c7 c6 c0 08 3d 8d 67 48 0f b9 3a e9 59 fe ff ff e8 3d 54 50 f8 48 8d 3d b6 3a 99 08 48 c7 c6 80 08 3d 8d <67> 48 0f b9 3a eb be 31 db e9 88 fd ff ff 48 8b 7c 24 20 e8 f7 9b
RSP: 0018:ffffc90002eafb70 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000200
RDX: ffff888027a78000 RSI: ffffffff8d3d0880 RDI: ffffffff925488f0
RBP: ffffe8ffac18a698 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff9c9ad5c0 R14: 0000000000000005 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88809574a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080000340 CR3: 00000000530ef000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7830
 napi_threaded_poll_loop+0x52f/0x870 net/core/dev.c:7950
 napi_threaded_poll+0x3a8/0x4b0 net/core/dev.c:8005
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	8d 3d c3 3a 99 08    	lea    0x8993ac3(%rip),%edi        # 0x8993ac9
   6:	48 c7 c6 c0 08 3d 8d 	mov    $0xffffffff8d3d08c0,%rsi
   d:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  12:	e9 59 fe ff ff       	jmp    0xfffffe70
  17:	e8 3d 54 50 f8       	call   0xf8505459
  1c:	48 8d 3d b6 3a 99 08 	lea    0x8993ab6(%rip),%rdi        # 0x8993ad9
  23:	48 c7 c6 80 08 3d 8d 	mov    $0xffffffff8d3d0880,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb be                	jmp    0xffffffef
  31:	31 db                	xor    %ebx,%ebx
  33:	e9 88 fd ff ff       	jmp    0xfffffdc0
  38:	48 8b 7c 24 20       	mov    0x20(%rsp),%rdi
  3d:	e8                   	.byte 0xe8
  3e:	f7                   	.byte 0xf7
  3f:	9b                   	fwait