======================================
| [   42.574312][  T615] Test #1 from CPU3: netcons_6fgrM
| [   42.574767][  T615] ------------[ cut here ]------------
| [ 42.574770][ T615] WARNING: CPU: 3 PID: 615 at net/core/dev.c:4737 ____napi_schedule (net/core/dev.c:4737) 
| [   42.574783][  T615] Modules linked in: netconsole netdevsim
[   42.574793][  T615] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 42.574795][ T615] RIP: 0010:____napi_schedule (net/core/dev.c:4737) 
[ 42.574799][ T615] 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
[   42.574802][  T615] RSP: 0018:ffffc900008176f0 EFLAGS: 00010046
[   42.574805][  T615] RAX: 0000000080000003 RBX: ffff888009b07000 RCX: 1ffffffff32f06e2
[   42.574807][  T615] RDX: 0000000000000000 RSI: ffff888009b07000 RDI: ffff8880361be8c0
[   42.574809][  T615] RBP: ffff8880361be8c0 R08: 0000000000000001 R09: fffff52000102eda
[   42.574811][  T615] R10: ffffc900008176d7 R11: ffffc900008172a1 R12: ffff88800f312840
[   42.574813][  T615] R13: 0000000000000070 R14: ffff888009b07000 R15: ffff888005592000
[   42.574815][  T615] FS:  00007fcde1d07740(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   42.574817][  T615] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   42.574821][  T615] CR2: 000055ddc363b2f8 CR3: 0000000002644003 CR4: 0000000000772ef0
[   42.574823][  T615] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   42.574824][  T615] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   42.574826][  T615] PKRU: 55555554
[   42.574827][  T615] Call Trace:
[   42.574829][  T615]  <TASK>
[ 42.574830][ T615] ? ____napi_schedule (net/core/dev.c:4737) 
[ 42.574834][ T615] ? __warn (kernel/panic.c:748) 
[ 42.574841][ T615] ? ____napi_schedule (net/core/dev.c:4737) 
[ 42.574849][ T615] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 42.574859][ T615] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 42.574864][ T615] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 42.574869][ T615] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 42.574888][ T615] ? ____napi_schedule (net/core/dev.c:4737) 
[ 42.574900][ T615] __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)) 
[ 42.574905][ T615] nsim_start_xmit (./include/linux/rcupdate.h:878 drivers/net/netdevsim/netdev.c:92) netdevsim 
[ 42.574920][ T615] ? netif_skb_features (net/core/dev.c:3696 net/core/dev.c:3788) 
[ 42.574930][ T615] netpoll_start_xmit (./include/linux/netdevice.h:5172 ./include/linux/netdevice.h:5181 net/core/netpoll.c:89) 
[ 42.574943][ T615] __netpoll_send_skb (net/core/netpoll.c:350) 
[ 42.574959][ T615] netpoll_send_skb (net/core/netpoll.c:386) 
[ 42.574965][ T615] send_ext_msg_udp (drivers/net/netconsole.c:1237 drivers/net/netconsole.c:1275 drivers/net/netconsole.c:1431) netconsole 
[ 42.574979][ T615] write_ext_msg (drivers/net/netconsole.c:1449 drivers/net/netconsole.c:1437) netconsole 
[ 42.574990][ T615] console_emit_next_record (kernel/printk/printk.c:3122 (discriminator 3)) 
[ 42.574995][ T615] ? perf_trace_lock (./include/trace/events/lock.h:50 ./include/trace/events/lock.h:50 ./include/trace/events/lock.h:50) 
[ 42.575003][ T615] ? __pfx_console_emit_next_record (kernel/printk/printk.c:3066) 
[ 42.575023][ T615] console_flush_all (kernel/printk/printk.c:3211) 
[ 42.575034][ T615] ? __pfx_console_flush_all (kernel/printk/printk.c:3172) 
[ 42.575050][ T615] console_unlock (kernel/printk/printk.c:3270 kernel/printk/printk.c:3309) 
[ 42.575055][ T615] ? __pfx_console_unlock (kernel/printk/printk.c:3304) 
[ 42.575059][ T615] ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5853) 
[ 42.575061][ T615] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 42.575069][ T615] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 42.575073][ T615] ? __down_trylock_console_sem (kernel/printk/printk.c:332) 
[ 42.575075][ T615] ? vprintk_emit.part.0 (kernel/printk/printk.c:2431) 
[ 42.575084][ T615] vprintk_emit.part.0 (kernel/printk/printk.c:2432) 
[ 42.575090][ T615] ? __pfx_vprintk_emit.part.0 (kernel/printk/printk.c:2378) 
[ 42.575098][ T615] ? other_cpu_in_panic (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 kernel/printk/printk.c:350 kernel/printk/printk.c:373) 
[ 42.575116][ T615] devkmsg_emit.constprop.0 (kernel/printk/printk.c:749) 
[ 42.575126][ T615] ? __pfx_devkmsg_emit.constprop.0 (kernel/printk/printk.c:749) 
[ 42.575135][ T615] ? __kasan_kmalloc (mm/kasan/common.c:398) 
[ 42.575141][ T615] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 21)) 
[ 42.575145][ T615] ? __kmalloc_noprof (mm/slub.c:4307) 
[ 42.575148][ T615] ? ___ratelimit (lib/ratelimit.c:75) 
[ 42.575159][ T615] devkmsg_write (kernel/printk/printk.c:819) 
[ 42.575162][ T615] ? usage_skip (kernel/locking/lockdep.c:2286) 
[ 42.575167][ T615] ? __pfx_devkmsg_write (kernel/printk/printk.c:762) 
[ 42.575183][ T615] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 42.575194][ T615] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 42.575204][ T615] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 42.575206][ T615] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 42.575219][ T615] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 42.575230][ T615] ksys_write (fs/read_write.c:731) 
[ 42.575236][ T615] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 42.575238][ T615] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 42.575253][ T615] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.575260][ T615] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   42.575263][  T615] RIP: 0033:0x7fcde1e48b77
[ 42.575267][ T615] 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
[   42.575269][  T615] RSP: 002b:00007fff759c2248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   42.575272][  T615] RAX: ffffffffffffffda RBX: 0000000000000021 RCX: 00007fcde1e48b77
[   42.575273][  T615] RDX: 0000000000000021 RSI: 000055ddc363a2f0 RDI: 0000000000000001
[   42.575275][  T615] RBP: 000055ddc363a2f0 R08: 0000000000000020 R09: 0000000000000077
[   42.575276][  T615] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000021


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