======================================
| 0
| xx__-> [   15.499510][  T231] ------------[ cut here ]------------
| [   15.500062][  T231] WARNING: CPU: 2 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)
| [   15.500693][  T231] Modules linked in:
[   15.501758][  T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.502220][  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)
[   15.502598][  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
[   15.503876][  T231] RSP: 0018:ffffc90000ac6df0 EFLAGS: 00010202
[   15.504330][  T231] RAX: 0000000000000007 RBX: 0000000000000001 RCX: ffffffff8f3f4955
[   15.504924][  T231] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888004efb606
[   15.505482][  T231] RBP: ffff888004efb600 R08: ffff88800bcb5cc0 R09: ffffed10009793b3
[   15.506031][  T231] R10: ffff888004bc9d9f R11: ffffc90000ac6b08 R12: ffff88800bcb5cc0
[   15.506563][  T231] R13: ffff888004bc9c00 R14: ffff888004bc9e08 R15: ffff888004bc9c00
[   15.507116][  T231] FS:  00000000397f23c0(0000) GS:ffff8880a471a000(0000) knlGS:0000000000000000
[   15.507748][  T231] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.508200][  T231] CR2: 00007ff7e9a66000 CR3: 0000000009b36005 CR4: 0000000000772ef0
[   15.508748][  T231] PKRU: 55555554
[   15.509042][  T231] Call Trace:
[   15.509323][  T231]  <TASK>
[   15.509659][  T231]  ? dev_get_stats (net/core/dev.c:4143)
[   15.510052][  T231]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.510427][  T231]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   15.510807][  T231]  __dev_queue_xmit (net/core/dev.c:4786)
[   15.511193][  T231]  ? netdev_core_pick_tx (net/core/dev.c:4728)
[   15.511558][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.511937][  T231]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   15.512296][  T231]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   15.512658][  T231]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   15.513030][  T231]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[   15.513406][  T231]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[   15.513783][  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)
[   15.514144][  T231]  ? ip_fragment.constprop.0 (net/ipv4/ip_output.c:201)
[   15.514504][  T231]  ? ip_skb_dst_mtu (./include/net/ip.h:523)
[   15.514878][  T231]  ? __ip_finish_output (./include/linux/skbuff.h:1724 ./include/linux/skbuff.h:5149 net/ipv4/ip_output.c:309)
[   15.515247][  T231]  ip_output (./include/linux/netfilter.h:414 net/ipv4/ip_output.c:438)
[   15.515529][  T231]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[   15.515909][  T231]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[   15.516286][  T231]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[   15.516649][  T231]  ? napi_skb_cache_get (net/core/skbuff.c:647)
[   15.517033][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.517399][  T231]  ? __tcp_send_ack.part.0 (./include/linux/skbuff.h:1383 net/ipv4/tcp_output.c:4434)
[   15.517770][  T231]  ? __tcp_ack_snd_check (./include/net/net_namespace.h:414 ./include/net/sock.h:695 ./include/net/inet_connection_sock.h:330 net/ipv4/tcp_input.c:341 net/ipv4/tcp_input.c:5910)
[   15.518136][  T231]  tcp_rcv_state_process (net/ipv4/tcp_input.c:7186)
[   15.518501][  T231]  ? skb_checksum (net/core/skbuff.c:3481)
[   15.518872][  T231]  ? tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6927)
[   15.519325][  T231]  tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1904)
[   15.519705][  T231]  tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2324)
[   15.520080][  T231]  ? raw_v4_input (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/ipv4/raw.c:196)
[   15.520448][  T231]  ? raw_v4_input (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/ipv4/raw.c:196)
[   15.520824][  T231]  ? tcp_filter (net/ipv4/tcp_ipv4.c:2153)
[   15.521102][  T231]  ? raw_v4_input (net/ipv4/raw.c:165)
[   15.521464][  T231]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.521838][  T231]  ? raw_rcv (net/ipv4/raw.c:165)
[   15.522116][  T231]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   15.522491][  T231]  ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207)
[   15.522865][  T231]  ip_local_deliver_finish.constprop.0 (./include/linux/rcupdate.h:895 net/ipv4/ip_input.c:242)
[   15.523309][  T231]  ? ip_local_deliver (net/ipv4/ip_input.c:566)
[   15.523678][  T231]  __netif_receive_skb_one_core (net/core/dev.c:6131)
[   15.524125][  T231]  ? __netif_receive_skb_list_core (net/core/dev.c:6131)
[   15.524567][  T231]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.524946][  T231]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   15.525306][  T231]  ? netif_receive_skb_internal (./include/linux/rcupdate.h:331 (discriminator 16) ./include/linux/rcupdate.h:867 (discriminator 16) net/core/dev.c:6324 (discriminator 16))
[   15.525762][  T231]  netif_receive_skb_internal (net/core/dev.c:6337)
[   15.526123][  T231]  ? __netif_receive_skb (net/core/dev.c:6316)
[   15.526480][  T231]  ? _copy_from_iter (./arch/x86/include/asm/smap.h:29 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 lib/iov_iter.c:55 ./include/linux/iov_iter.h:52 ./include/linux/iov_iter.h:304 ./include/linux/iov_iter.h:330 lib/iov_iter.c:249 lib/iov_iter.c:260)
[   15.526855][  T231]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.527216][  T231]  netif_receive_skb (net/core/dev.c:6396)
[   15.527577][  T231]  tun_rx_batched.isra.0 (./include/linux/bottom_half.h:33 drivers/net/tun.c:1510)
[   15.527954][  T231]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.528313][  T231]  ? tun_setup (drivers/net/tun.c:1474)
[   15.528690][  T231]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.529051][  T231]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[   15.529430][  T231]  ? tun_get_user (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:867 drivers/net/tun.c:1894)
[   15.529806][  T231]  tun_get_user (drivers/net/tun.c:1953)
[   15.530185][  T231]  ? tcp_mmap (net/ipv4/tcp.c:2324)
[   15.530462][  T231]  ? tcp_recvmsg (net/ipv4/tcp.c:2932)
[   15.530834][  T231]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.531192][  T231]  ? tun_build_skb (drivers/net/tun.c:1696)
[   15.531557][  T231]  ? ref_tracker_dir_print (lib/ref_tracker.c:256)
[   15.531958][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.532326][  T231]  ? tun_get (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 drivers/net/tun.c:793)
[   15.532605][  T231]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.532984][  T231]  ? tun_get (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 drivers/net/tun.c:793)
[   15.533271][  T231]  tun_chr_write_iter (drivers/net/tun.c:800 drivers/net/tun.c:2001)
[   15.533641][  T231]  do_iter_readv_writev (fs/read_write.c:828)
[   15.534018][  T231]  ? ksys_lseek (fs/read_write.c:814)
[   15.534388][  T231]  ? import_iovec (lib/iov_iter.c:1430)
[   15.534762][  T231]  vfs_writev (fs/read_write.c:1057)
[   15.535048][  T231]  ? vfs_iocb_iter_write (fs/read_write.c:1030)
[   15.535408][  T231]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.535787][  T231]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.536157][  T231]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.536519][  T231]  ? __fget_files (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 fs/file.c:1072)
[   15.536890][  T231]  ? __fget_files (fs/file.c:1075)
[   15.537258][  T231]  ? do_writev (fs/read_write.c:1103)
[   15.537536][  T231]  do_writev (fs/read_write.c:1103)
[   15.537824][  T231]  ? vfs_writev (fs/read_write.c:1093)
[   15.538192][  T231]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   15.538553][  T231]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   15.539009][  T231] RIP: 0033:0x4909bd
[   15.539301][  T231] Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 fa 70 04 00 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 14 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 4e 71 04 00 48
All code
========
   0:	28 89 54 24 1c 48    	sub    %cl,0x481c2454(%rcx)
   6:	89 74 24 10          	mov    %esi,0x10(%rsp)
   a:	89 7c 24 08          	mov    %edi,0x8(%rsp)
   e:	e8 fa 70 04 00       	call   0x4710d
  13:	8b 54 24 1c          	mov    0x1c(%rsp),%edx
  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 14 00 00 00       	mov    $0x14,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 33                	ja     0x65
  32:	44 89 c7             	mov    %r8d,%edi
  35:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  3a:	e8 4e 71 04 00       	call   0x4718d
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 33                	ja     0x3b
   8:	44 89 c7             	mov    %r8d,%edi
   b:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  10:	e8 4e 71 04 00       	call   0x47163
  15:	48                   	rex.W
[   15.540551][  T231] RSP: 002b:00007ffd284fca50 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
[   15.541110][  T231] RAX: ffffffffffffffda RBX: 00007ffd284fd0e0 RCX: 00000000004909bd
[   15.541650][  T231] RDX: 0000000000000002 RSI: 00007ffd284fca90 RDI: 0000000000000005
[   15.542192][  T231] RBP: 00007ffd284fcac0 R08: 0000000000000000 R09: 00007ffd284fcb20
[   15.542734][  T231] R10: 7fffffffffffffff R11: 0000000000000293 R12: 00007ffd284fd058


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