======================================
| xx__-> [ 2736.579194][T26781] tun: Universal TUN/TAP device driver, 1.6
| [ 2739.908432][T26787] ------------[ cut here ]------------
| [ 2739.909004][T26787] WARNING: CPU: 3 PID: 26787 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)
| [ 2739.909839][T26787] Modules linked in: xt_tcpudp xt_conntrack nft_compat x_tables tun nft_meta_bridge br_netfilter macvlan sctp_diag nft_limit nfnetlink_queue nft_queue sctp ip6_udp_tunnel udp_tunnel nft_numgen dummy nf_log_syslog nft_log nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib esp4 sha1 xfrm_user 8021q bridge stp llc nft_flow_offload nf_flow_table_inet nf_flow_table nf_conntrack_netlink nft_redir nft_nat nft_masq nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 tcp_diag inet_diag veth nf_tables
[ 2739.914290][T26787] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2739.914772][T26787] 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)
[ 2739.915169][T26787] 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 7e 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 7e 0d 00 00    	jne    0xda0
  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
[ 2739.916516][T26787] RSP: 0018:ffffc90002d1ee20 EFLAGS: 00010202
[ 2739.917022][T26787] RAX: 0000000000000007 RBX: 0000000000000001 RCX: ffffffffade1eef5
[ 2739.917619][T26787] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888019b9b606
[ 2739.918163][T26787] RBP: ffff888019b9b600 R08: ffff888004cb1380 R09: ffffed1001e8dcb3
[ 2739.918753][T26787] R10: ffff88800f46e59f R11: ffffc90002d1eb38 R12: ffff888004cb1380
[ 2739.919307][T26787] R13: ffff88800f46e400 R14: ffff88800f46e608 R15: ffff88800f46e400
[ 2739.920187][T26787] FS:  000000002775a3c0(0000) GS:ffff888085d6c000(0000) knlGS:0000000000000000
[ 2739.920864][T26787] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2739.921332][T26787] CR2: 00007f505f40a000 CR3: 000000000ee04002 CR4: 0000000000772ef0
[ 2739.921934][T26787] PKRU: 55555554
[ 2739.922217][T26787] Call Trace:
[ 2739.922509][T26787]  <TASK>
[ 2739.922715][T26787]  ? dev_get_stats (net/core/dev.c:4143)
[ 2739.923105][T26787]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 2739.923494][T26787]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[ 2739.923881][T26787]  __dev_queue_xmit (net/core/dev.c:4786)
[ 2739.924251][T26787]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2739.924633][T26787]  ? netdev_core_pick_tx (net/core/dev.c:4728)
[ 2739.924996][T26787]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 2739.925352][T26787]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[ 2739.925734][T26787]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 2739.926133][T26787]  ? neigh_connected_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:836 net/core/neighbour.c:1617)
[ 2739.926514][T26787]  ip_finish_output2 (./include/net/neighbour.h:556 net/ipv4/ip_output.c:237)
[ 2739.926906][T26787]  ? ip_skb_dst_mtu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/ip.h:504 ./include/net/ip.h:518)
[ 2739.927271][T26787]  ? ip_append_data.part.0 (net/ipv4/ip_output.c:201)
[ 2739.927647][T26787]  ? ip_skb_dst_mtu (./include/net/ip.h:523)
[ 2739.928013][T26787]  ? __ip_finish_output (./include/linux/skbuff.h:1724 ./include/linux/skbuff.h:5149 net/ipv4/ip_output.c:309 net/ipv4/ip_output.c:297)
[ 2739.928377][T26787]  ip_output (./include/linux/netfilter.h:307 net/ipv4/ip_output.c:438)
[ 2739.928671][T26787]  __ip_queue_xmit (./include/net/dst.h:464 net/ipv4/ip_output.c:131 net/ipv4/ip_output.c:534)
[ 2739.929030][T26787]  ? kmem_cache_alloc_node_noprof (mm/slub.c:5337)
[ 2739.929519][T26787]  __tcp_transmit_skb (net/ipv4/tcp_output.c:1628)
[ 2739.929908][T26787]  ? __tcp_select_window (net/ipv4/tcp_output.c:1449)
[ 2739.930276][T26787]  ? __tcp_send_ack.part.0 (./include/linux/skbuff.h:1383 net/ipv4/tcp_output.c:4434)
[ 2739.930654][T26787]  ? __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)
[ 2739.931028][T26787]  tcp_rcv_established (net/ipv4/tcp_input.c:5976 net/ipv4/tcp_input.c:6467)
[ 2739.931398][T26787]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2739.931775][T26787]  ? tcp_check_space (net/ipv4/tcp_input.c:6276)
[ 2739.932143][T26787]  ? ipv4_dst_check (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/ipv4/route.c:402 net/ipv4/route.c:1217)
[ 2739.932550][T26787]  tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1929)
[ 2739.932950][T26787]  tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2324)
[ 2739.933326][T26787]  ? tcp_filter (net/ipv4/tcp_ipv4.c:2153)
[ 2739.933633][T26787]  ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207)
[ 2739.934011][T26787]  ip_local_deliver_finish (./include/linux/rcupdate.h:895 net/ipv4/ip_input.c:242)
[ 2739.934373][T26787]  ? ip_local_deliver (net/ipv4/ip_input.c:566)
[ 2739.934768][T26787]  __netif_receive_skb_one_core (net/core/dev.c:6131)
[ 2739.935218][T26787]  ? __netif_receive_skb_list_core (net/core/dev.c:6131)
[ 2739.935688][T26787]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 2739.936055][T26787]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[ 2739.936418][T26787]  ? 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))
[ 2739.936901][T26787]  netif_receive_skb_internal (net/core/dev.c:6337)
[ 2739.937263][T26787]  ? __netif_receive_skb (net/core/dev.c:6316)
[ 2739.937645][T26787]  ? _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)
[ 2739.938021][T26787]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 2739.938393][T26787]  netif_receive_skb (net/core/dev.c:6396)
[ 2739.938761][T26787] tun_rx_batched.isra.0 (./include/linux/bottom_half.h:33 drivers/net/tun.c:1510) tun
[ 2739.939215][T26787]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2739.939616][T26787]  ? tun_setup (drivers/net/tun.c:1474) tun
[ 2739.939989][T26787]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 2739.940350][T26787]  ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831)
[ 2739.940724][T26787]  ? tun_get_user (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:867 drivers/net/tun.c:1894) tun
[ 2739.941092][T26787] tun_get_user (drivers/net/tun.c:1953) tun
[ 2739.941481][T26787]  ? tun_build_skb (drivers/net/tun.c:1696) tun
[ 2739.941855][T26787]  ? ref_tracker_dir_print (lib/ref_tracker.c:256)
[ 2739.942240][T26787]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2739.942619][T26787]  ? tun_get (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 drivers/net/tun.c:793) tun
[ 2739.942981][T26787]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 2739.943345][T26787]  ? tun_get (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 drivers/net/tun.c:793) tun
[ 2739.943729][T26787] tun_chr_write_iter (drivers/net/tun.c:800 drivers/net/tun.c:2001) tun
[ 2739.944093][T26787]  do_iter_readv_writev (fs/read_write.c:828)
[ 2739.944486][T26787]  ? ksys_lseek (fs/read_write.c:814)
[ 2739.944869][T26787]  ? import_iovec (lib/iov_iter.c:1430)
[ 2739.945238][T26787]  vfs_writev (fs/read_write.c:1057)
[ 2739.945517][T26787]  ? validate_chain (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876)
[ 2739.945889][T26787]  ? vfs_iocb_iter_write (fs/read_write.c:1030)
[ 2739.946245][T26787]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2739.946650][T26787]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2739.947028][T26787]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 2739.947407][T26787]  ? __fget_files (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 fs/file.c:1072)
[ 2739.947785][T26787]  ? __fget_files (fs/file.c:1075)
[ 2739.948152][T26787]  ? __rseq_handle_notify_resume (kernel/rseq.c:442)
[ 2739.948628][T26787]  ? do_writev (fs/read_write.c:1103)
[ 2739.948903][T26787]  do_writev (fs/read_write.c:1103)
[ 2739.949173][T26787]  ? vfs_writev (fs/read_write.c:1093)
[ 2739.949553][T26787]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 2739.949928][T26787]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 2739.950388][T26787] RIP: 0033:0x4909bd
[ 2739.950684][T26787] 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
[ 2739.952009][T26787] RSP: 002b:00007fff66374370 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
[ 2739.952567][T26787] RAX: ffffffffffffffda RBX: 00007fff663749b8 RCX: 00000000004909bd
[ 2739.953128][T26787] RDX: 0000000000000002 RSI: 00007fff663743b0 RDI: 0000000000000006
[ 2739.953686][T26787] RBP: 00007fff663743e0 R08: 0000000000000000 R09: 00007fff66374440
[ 2739.954232][T26787] R10: 7fffffffffffffff R11: 0000000000000293 R12: 00007fff66374978


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