======================================
| 0
| xx__-> [   20.681935][  T231] ------------[ cut here ]------------
| [   20.682474][  T231] WARNING: CPU: 3 PID: 231 at ./include/net/sch_generic.h:843 __dev_xmit_skb (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:901 net/core/dev.c:4239)
| [   20.683165][  T231] Modules linked in:
[   20.684419][  T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.684861][  T231] RIP: 0010:__dev_xmit_skb (./include/net/sch_generic.h:843 ./include/net/sch_generic.h:889 ./include/net/sch_generic.h:901 net/core/dev.c:4239)
[   20.685230][  T231] Code: 7d 06 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 86 0d 00 00 66 83 7d 06 00 74 04 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48
All code
========
   0:	7d 06                	jge    0x8
   2:	48 89 fa             	mov    %rdi,%rdx
   5:	48 c1 ea 03          	shr    $0x3,%rdx
   9:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   d:	48 89 f8             	mov    %rdi,%rax
  10:	83 e0 07             	and    $0x7,%eax
  13:	83 c0 01             	add    $0x1,%eax
  16:	38 d0                	cmp    %dl,%al
  18:	7c 08                	jl     0x22
  1a:	84 d2                	test   %dl,%dl
  1c:	0f 85 86 0d 00 00    	jne    0xda8
  22:	66 83 7d 06 00       	cmpw   $0x0,0x6(%rbp)
  27:	74 04                	je     0x2d
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	49 8d 7c 24 28       	lea    0x28(%r12),%rdi
  3c:	48 89 fa             	mov    %rdi,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	49 8d 7c 24 28       	lea    0x28(%r12),%rdi
  12:	48 89 fa             	mov    %rdi,%rdx
  15:	48                   	rex.W
[   20.686442][  T231] RSP: 0018:ffffc90000af7700 EFLAGS: 00010202
[   20.686890][  T231] RAX: 0000000000000007 RBX: 0000000000000001 RCX: ffffffff9e9f4955
[   20.687388][  T231] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888005346486
[   20.687907][  T231] RBP: ffff888005346480 R08: ffff8880058c7840 R09: ffffed10022decb3
[   20.688401][  T231] R10: ffff8880116f659f R11: ffffc90000af7418 R12: ffff8880058c7840
[   20.688910][  T231] R13: ffff8880116f6400 R14: ffff8880116f6608 R15: ffff8880116f6400
[   20.689398][  T231] FS:  000000000648a3c0(0000) GS:ffff88809519a000(0000) knlGS:0000000000000000
[   20.689992][  T231] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.690400][  T231] CR2: 00007f93de79a000 CR3: 000000000504e002 CR4: 0000000000772ef0
[   20.690916][  T231] PKRU: 55555554
[   20.691165][  T231] Call Trace:
[   20.691416][  T231]  <TASK>
[   20.691596][  T231]  ? dev_get_stats (net/core/dev.c:4143)
[   20.691955][  T231]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.692287][  T231]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   20.692622][  T231]  __dev_queue_xmit (net/core/dev.c:4786)
[   20.692984][  T231]  ? netdev_core_pick_tx (net/core/dev.c:4728)
[   20.693306][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.693648][  T231]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   20.693983][  T231]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   20.694307][  T231]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   20.694655][  T231]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[   20.695035][  T231]  ? ip_skb_dst_mtu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/ip.h:504 ./include/net/ip.h:518)
[   20.695380][  T231]  ? ip_fragment.constprop.0 (net/ipv4/ip_output.c:201)
[   20.695714][  T231]  ? ip_skb_dst_mtu (./include/net/ip.h:523)
[   20.696057][  T231]  ? __ip_finish_output (./include/linux/skbuff.h:1724 ./include/linux/skbuff.h:5149 net/ipv4/ip_output.c:309)
[   20.696389][  T231]  ip_output (./include/linux/netfilter.h:414 net/ipv4/ip_output.c:438)
[   20.696650][  T231]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[   20.696997][  T231]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[   20.697331][  T231]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[   20.697673][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.698018][  T231]  ? ktime_get (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:824)
[   20.698342][  T231]  ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:95 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86)
[   20.698687][  T231]  tcp_send_active_reset (net/ipv4/tcp_output.c:3833)
[   20.699025][  T231]  ? sock_rfree (./arch/x86/include/asm/atomic.h:40 ./include/linux/atomic/atomic-arch-fallback.h:769 ./include/linux/atomic/atomic-instrumented.h:271 net/core/sock.c:2783)
[   20.699352][  T231]  __tcp_close (net/ipv4/tcp.c:3211)
[   20.699695][  T231]  tcp_close (net/ipv4/tcp.c:3300)
[   20.699953][  T231]  inet_release (net/ipv4/af_inet.c:438)
[   20.700277][  T231]  __sock_release (net/socket.c:663)
[   20.700607][  T231]  sock_close (net/socket.c:1457)
[   20.700879][  T231]  __fput (fs/file_table.c:468)
[   20.701139][  T231]  fput_close_sync (fs/file_table.c:571)
[   20.701457][  T231]  ? alloc_file_clone (fs/file_table.c:571)
[   20.701821][  T231]  __x64_sys_close (fs/open.c:1592 fs/open.c:1574 fs/open.c:1574)
[   20.702142][  T231]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   20.702464][  T231]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   20.702893][  T231] RIP: 0033:0x4901eb
[   20.703151][  T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
All code
========
   0:	03 00                	add    (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	0f 05                	syscall
   6:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   c:	77 41                	ja     0x4f
   e:	c3                   	ret
   f:	48 83 ec 18          	sub    $0x18,%rsp
  13:	89 7c 24 0c          	mov    %edi,0xc(%rsp)
  17:	e8 c3 78 04 00       	call   0x478df
  1c:	8b 7c 24 0c          	mov    0xc(%rsp),%edi
  20:	41 89 c0             	mov    %eax,%r8d
  23:	b8 03 00 00 00       	mov    $0x3,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 0c          	mov    %eax,0xc(%rsp)
  39:	e8 21 79 04 00       	call   0x4795f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 0c          	mov    %eax,0xc(%rsp)
   f:	e8 21 79 04 00       	call   0x47935
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   20.704320][  T231] RSP: 002b:00007ffe97a9bf60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   20.704836][  T231] RAX: ffffffffffffffda RBX: 00007ffe97a9c520 RCX: 00000000004901eb
[   20.705320][  T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000000a
[   20.705838][  T231] RBP: 00007ffe97a9bfb0 R08: 0000000000000000 R09: 0000000006492170
[   20.706319][  T231] R10: 0000000000000001 R11: 0000000000000293 R12: 00007ffe97a9c498


Finger prints:
__dev_xmit_skb:__dev_queue_xmit:ip_finish_output2:ip_output:__ip_queue_xmit