======================================
| 0
| xx__-> [   31.002860][  T342] ------------[ cut here ]------------
| [   31.003300][  T342] WARNING: CPU: 3 PID: 342 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)
| [   31.003850][  T342] Modules linked in:
[   31.004772][  T342] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   31.005164][  T342] 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)
[   31.005483][  T342] 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
[   31.006596][  T342] RSP: 0018:ffffc90000fa72e0 EFLAGS: 00010206
[   31.007006][  T342] RAX: 0000000000000007 RBX: 0000000000000005 RCX: ffffffff875f4955
[   31.007472][  T342] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888004eccc06
[   31.007946][  T342] RBP: ffff888004eccc00 R08: ffff888004de0118 R09: ffffed10014a63b3
[   31.008413][  T342] R10: ffff88800a531d9f R11: ffffc90000fa6ff8 R12: ffff888004de0118
[   31.008895][  T342] R13: ffff88800a531c00 R14: ffff88800a531e08 R15: ffff88800a531c00
[   31.009377][  T342] FS:  000000002ef203c0(0000) GS:ffff8880ac59a000(0000) knlGS:0000000000000000
[   31.009929][  T342] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.010321][  T342] CR2: 00007f343e0a6000 CR3: 000000000963f005 CR4: 0000000000772ef0
[   31.010800][  T342] PKRU: 55555554
[   31.011066][  T342] Call Trace:
[   31.011304][  T342]  <TASK>
[   31.011609][  T342]  ? dev_get_stats (net/core/dev.c:4143)
[   31.011948][  T342]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   31.012269][  T342]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   31.012579][  T342]  __dev_queue_xmit (net/core/dev.c:4786)
[   31.012911][  T342]  ? netdev_core_pick_tx (net/core/dev.c:4728)
[   31.013218][  T342]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   31.013529][  T342]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   31.013846][  T342]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   31.014157][  T342]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   31.014472][  T342]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[   31.014789][  T342]  ? ip_skb_dst_mtu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/ip.h:504 ./include/net/ip.h:518)
[   31.015096][  T342]  ? ip_fragment.constprop.0 (net/ipv4/ip_output.c:201)
[   31.015407][  T342]  ? __ip_finish_output (net/ipv4/ip_output.c:258 net/ipv4/ip_output.c:310)
[   31.015715][  T342]  ip_output (./include/linux/netfilter.h:414 net/ipv4/ip_output.c:438)
[   31.015958][  T342]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[   31.016263][  T342]  ? __skb_clone (./arch/x86/include/asm/atomic.h:53 (discriminator 4) ./include/linux/atomic/atomic-arch-fallback.h:992 (discriminator 4) ./include/linux/atomic/atomic-instrumented.h:436 (discriminator 4) net/core/skbuff.c:1585 (discriminator 4))
[   31.016573][  T342]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[   31.016910][  T342]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[   31.017220][  T342]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   31.017528][  T342]  ? ktime_get (./include/linux/seqlock.h:74 kernel/time/timekeeping.c:824)
[   31.017849][  T342]  tcp_write_xmit (net/ipv4/tcp_output.c:2999)
[   31.018170][  T342]  ? __alloc_skb (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 ./include/linux/refcount.h:134 net/core/skbuff.c:698)
[   31.018478][  T342]  ? tcp_retrans_try_collapse (net/ipv4/tcp_output.c:2903)
[   31.018793][  T342]  ? skb_do_copy_data_nocache (./include/net/sock.h:2281)
[   31.019104][  T342]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   31.019406][  T342]  ? trace_tcp_ao_handshake_failure (./include/net/sock.h:2275)
[   31.019800][  T342]  __tcp_push_pending_frames (net/ipv4/tcp_output.c:3182)
[   31.020113][  T342]  tcp_sendmsg_locked (net/ipv4/tcp.c:1375)
[   31.020432][  T342]  ? tcp_sendmsg_fastopen (net/ipv4/tcp.c:1078)
[   31.020738][  T342]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   31.021068][  T342]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[   31.021377][  T342]  tcp_sendmsg (net/ipv4/tcp.c:1413)
[   31.021609][  T342]  sock_write_iter (net/socket.c:727 net/socket.c:742 net/socket.c:1195)
[   31.021929][  T342]  ? ____sys_recvmsg (net/socket.c:1176)
[   31.022245][  T342]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   31.022555][  T342]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[   31.022799][  T342]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   31.023127][  T342]  ? kernel_write (fs/read_write.c:667)
[   31.023436][  T342]  ? __fget_files (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 fs/file.c:1072)
[   31.023766][  T342]  ksys_write (fs/read_write.c:738)
[   31.024004][  T342]  ? __ia32_sys_read (fs/read_write.c:728)
[   31.024318][  T342]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   31.024626][  T342]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   31.025014][  T342] RIP: 0033:0x49002f
[   31.025258][  T342] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 89 7a 04 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 dc 7a 04 00 48
All code
========
   0:	89 54 24 18          	mov    %edx,0x18(%rsp)
   4:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
   9:	89 7c 24 08          	mov    %edi,0x8(%rsp)
   d:	e8 89 7a 04 00       	call   0x47a9b
  12:	48 8b 54 24 18       	mov    0x18(%rsp),%rdx
  17:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
  1c:	41 89 c0             	mov    %eax,%r8d
  1f:	8b 7c 24 08          	mov    0x8(%rsp),%edi
  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 31                	ja     0x63
  32:	44 89 c7             	mov    %r8d,%edi
  35:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  3a:	e8 dc 7a 04 00       	call   0x47b1b
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 31                	ja     0x39
   8:	44 89 c7             	mov    %r8d,%edi
   b:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  10:	e8 dc 7a 04 00       	call   0x47af1
  15:	48                   	rex.W
[   31.026365][  T342] RSP: 002b:00007ffc04228da0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[   31.026853][  T342] RAX: ffffffffffffffda RBX: 00007ffc04229390 RCX: 000000000049002f
[   31.027315][  T342] RDX: 0000000000001388 RSI: 000000002ef27130 RDI: 000000000000000a
[   31.027785][  T342] RBP: 00007ffc04228e20 R08: 0000000000000000 R09: 0000000000000147
[   31.028251][  T342] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffc04229308


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