======================================
| [   14.615802][  T220] netconsole: network logging started
| [   14.616294][  T220] ------------[ cut here ]------------
| [ 14.616298][ T220] WARNING: CPU: 3 PID: 220 at net/core/dev.c:4737 ____napi_schedule (net/core/dev.c:4737) 
| [   14.616311][  T220] Modules linked in: netconsole netdevsim
[   14.616322][  T220] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.616324][ T220] RIP: 0010:____napi_schedule (net/core/dev.c:4737) 
[ 14.616329][ T220] Code: 84 7b fe ff ff be 08 00 00 00 4c 89 e7 e8 fd d1 76 fe f0 80 4b 11 02 48 83 c4 08 4c 89 ef 5b 5d 41 5c 41 5d e9 d6 e3 fc fd 90 <0f> 0b 90 e9 e1 fd ff ff 48 89 ea 48 89 df e8 92 4f d9 fe e9 fa fe
All code
========
   0:	84 7b fe             	test   %bh,-0x2(%rbx)
   3:	ff                   	(bad)
   4:	ff                   	(bad)
   5:	be 08 00 00 00       	mov    $0x8,%esi
   a:	4c 89 e7             	mov    %r12,%rdi
   d:	e8 fd d1 76 fe       	call   0xfffffffffe76d20f
  12:	f0 80 4b 11 02       	lock orb $0x2,0x11(%rbx)
  17:	48 83 c4 08          	add    $0x8,%rsp
  1b:	4c 89 ef             	mov    %r13,%rdi
  1e:	5b                   	pop    %rbx
  1f:	5d                   	pop    %rbp
  20:	41 5c                	pop    %r12
  22:	41 5d                	pop    %r13
  24:	e9 d6 e3 fc fd       	jmp    0xfffffffffdfce3ff
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 e1 fd ff ff       	jmp    0xfffffffffffffe13
  32:	48 89 ea             	mov    %rbp,%rdx
  35:	48 89 df             	mov    %rbx,%rdi
  38:	e8 92 4f d9 fe       	call   0xfffffffffed94fcf
  3d:	e9                   	.byte 0xe9
  3e:	fa                   	cli
  3f:	fe                   	.byte 0xfe

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 e1 fd ff ff       	jmp    0xfffffffffffffde9
   8:	48 89 ea             	mov    %rbp,%rdx
   b:	48 89 df             	mov    %rbx,%rdi
   e:	e8 92 4f d9 fe       	call   0xfffffffffed94fa5
  13:	e9                   	.byte 0xe9
  14:	fa                   	cli
  15:	fe                   	.byte 0xfe
[   14.616332][  T220] RSP: 0018:ffffc90000b47698 EFLAGS: 00010046
[   14.616335][  T220] RAX: 0000000080000003 RBX: ffff888009a05800 RCX: 1ffffffff61306e2
[   14.616337][  T220] RDX: 0000000000000000 RSI: ffff888009a05800 RDI: ffff88802f5be8c0
[   14.616339][  T220] RBP: ffff88802f5be8c0 R08: 0000000000000001 R09: fffff52000168ecf
[   14.616341][  T220] R10: ffffc90000b4767f R11: ffffc90000b47249 R12: ffff888004bba1c0
[   14.616343][  T220] R13: 000000000000006b R14: ffff888009a05800 R15: ffff888005fb2000
[   14.616345][  T220] FS:  00007f57a36ae740(0000) GS:ffff88802f580000(0000) knlGS:0000000000000000
[   14.616347][  T220] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.616352][  T220] CR2: 000056150235eb30 CR3: 00000000098aa005 CR4: 0000000000772ef0
[   14.616353][  T220] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   14.616355][  T220] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   14.616356][  T220] PKRU: 55555554
[   14.616357][  T220] Call Trace:
[   14.616360][  T220]  <TASK>
[ 14.616361][ T220] ? ____napi_schedule (net/core/dev.c:4737) 
[ 14.616365][ T220] ? __warn (kernel/panic.c:748) 
[ 14.616373][ T220] ? ____napi_schedule (net/core/dev.c:4737) 
[ 14.616380][ T220] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 14.616392][ T220] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 14.616398][ T220] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 14.616403][ T220] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 14.616424][ T220] ? ____napi_schedule (net/core/dev.c:4737) 
[ 14.616438][ T220] __napi_schedule (./arch/x86/include/asm/irqflags.h:26 (discriminator 3) ./arch/x86/include/asm/irqflags.h:87 (discriminator 3) ./arch/x86/include/asm/irqflags.h:147 (discriminator 3) net/core/dev.c:6412 (discriminator 3)) 
[ 14.616444][ T220] nsim_start_xmit (./include/linux/rcupdate.h:878 drivers/net/netdevsim/netdev.c:92) netdevsim 
[ 14.616458][ T220] ? netif_skb_features (net/core/dev.c:3696 net/core/dev.c:3788) 
[ 14.616469][ T220] netpoll_start_xmit (./include/linux/netdevice.h:5172 ./include/linux/netdevice.h:5181 net/core/netpoll.c:89) 
[ 14.616482][ T220] __netpoll_send_skb (net/core/netpoll.c:350) 
[ 14.616501][ T220] netpoll_send_skb (net/core/netpoll.c:386) 
[ 14.616507][ T220] send_ext_msg_udp (drivers/net/netconsole.c:1237 drivers/net/netconsole.c:1275 drivers/net/netconsole.c:1431) netconsole 
[ 14.616522][ T220] write_ext_msg (drivers/net/netconsole.c:1449 drivers/net/netconsole.c:1437) netconsole 
[ 14.616534][ T220] console_emit_next_record (kernel/printk/printk.c:3122 (discriminator 3)) 
[ 14.616538][ T220] ? perf_trace_lock (./include/trace/events/lock.h:50 ./include/trace/events/lock.h:50 ./include/trace/events/lock.h:50) 
[ 14.616547][ T220] ? __pfx_console_emit_next_record (kernel/printk/printk.c:3066) 
[ 14.616570][ T220] console_flush_all (kernel/printk/printk.c:3211) 
[ 14.616582][ T220] ? __pfx_console_flush_all (kernel/printk/printk.c:3172) 
[ 14.616600][ T220] console_unlock (kernel/printk/printk.c:3270 kernel/printk/printk.c:3309) 
[ 14.616606][ T220] ? __pfx_console_unlock (kernel/printk/printk.c:3304) 
[ 14.616609][ T220] ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5853) 
[ 14.616612][ T220] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 14.616621][ T220] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 14.616625][ T220] ? __down_trylock_console_sem (kernel/printk/printk.c:332) 
[ 14.616627][ T220] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 14.616637][ T220] vprintk_emit.part.0 (kernel/printk/printk.c:2432) 
[ 14.616644][ T220] ? __pfx_vprintk_emit.part.0 (kernel/printk/printk.c:2378) 
[ 14.616652][ T220] ? __pfx_netdev_run_todo (net/core/dev.c:11361) 
[ 14.616665][ T220] _printk (kernel/printk/printk.c:2452) 
[ 14.616669][ T220] ? __pfx__printk (kernel/printk/printk.c:2452) 
[ 14.616677][ T220] ? netpoll_setup (net/core/netpoll.c:804) 
[ 14.616690][ T220] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:908) 
[ 14.616698][ T220] enabled_store (drivers/net/netconsole.c:491) netconsole 
[ 14.616704][ T220] ? down_read (kernel/locking/rwsem.c:1247 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) 
[ 14.616707][ T220] ? configfs_write_iter (fs/configfs/file.c:206 fs/configfs/file.c:229) 
[ 14.616714][ T220] ? __pfx_enabled_store (drivers/net/netconsole.c:436) netconsole 
[ 14.616732][ T220] ? __pfx_enabled_store (drivers/net/netconsole.c:436) netconsole 
[ 14.616737][ T220] configfs_write_iter (fs/configfs/file.c:207 fs/configfs/file.c:229) 
[ 14.616748][ T220] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 14.616760][ T220] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 14.616770][ T220] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 14.616784][ T220] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 14.616799][ T220] ksys_write (fs/read_write.c:731) 
[ 14.616805][ T220] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 14.616823][ T220] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 14.616831][ T220] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   14.616834][  T220] RIP: 0033:0x7f57a37efb77
[ 14.616840][ T220] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
All code
========
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[   14.616842][  T220] RSP: 002b:00007ffff6bcfae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   14.616845][  T220] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f57a37efb77
[   14.616847][  T220] RDX: 0000000000000002 RSI: 00005615023c5b00 RDI: 0000000000000001
[   14.616848][  T220] RBP: 00005615023c5b00 R08: 0000000000000000 R09: 00007f57a38624e0
[   14.616850][  T220] R10: 00007f57a38623e0 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
____napi_schedule:__napi_schedule:nsim_start_xmit:netpoll_start_xmit:__netpoll_send_skb