======================================
| 0
| xx__-> [ 1175.487073][    C3] ------------[ cut here ]------------
| [ 1175.487493][    C3] WARNING: ./include/linux/skbuff.h:3239 at __udp4_lib_err_encap+0x6cc/0xae0, CPU#3: mausezahn/5428
| [ 1175.487894][    C3] Modules linked in: act_tunnel_key cls_matchall vxlan ip6_udp_tunnel udp_tunnel sch_tbf act_gact cls_flower sch_ingress bridge stp llc 8021q vrf veth
[ 1175.488672][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1175.488848][    C3] RIP: 0010:__udp4_lib_err_encap (./include/linux/skbuff.h:3239 (discriminator 3) ./include/linux/skbuff.h:3235 (discriminator 3) net/ipv4/udp.c:864 (discriminator 3))
[ 1175.489036][    C3] Code: 70 02 00 00 0f b6 2e 83 e5 0f 90 0f 0b 90 e9 e4 fa ff ff 90 0f 0b 90 90 0f 0b 90 e9 b8 fc ff ff 90 0f 0b 90 e9 3a fa ff ff 90 <0f> 0b 90 e9 48 fa ff ff 4c 8b 6c 24 20 45 31 e4 e9 38 fd ff ff 48
All code
========
   0:	70 02                	jo     0x4
   2:	00 00                	add    %al,(%rax)
   4:	0f b6 2e             	movzbl (%rsi),%ebp
   7:	83 e5 0f             	and    $0xf,%ebp
   a:	90                   	nop
   b:	0f 0b                	ud2
   d:	90                   	nop
   e:	e9 e4 fa ff ff       	jmp    0xfffffffffffffaf7
  13:	90                   	nop
  14:	0f 0b                	ud2
  16:	90                   	nop
  17:	90                   	nop
  18:	0f 0b                	ud2
  1a:	90                   	nop
  1b:	e9 b8 fc ff ff       	jmp    0xfffffffffffffcd8
  20:	90                   	nop
  21:	0f 0b                	ud2
  23:	90                   	nop
  24:	e9 3a fa ff ff       	jmp    0xfffffffffffffa63
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 48 fa ff ff       	jmp    0xfffffffffffffa7a
  32:	4c 8b 6c 24 20       	mov    0x20(%rsp),%r13
  37:	45 31 e4             	xor    %r12d,%r12d
  3a:	e9 38 fd ff ff       	jmp    0xfffffffffffffd77
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 48 fa ff ff       	jmp    0xfffffffffffffa50
   8:	4c 8b 6c 24 20       	mov    0x20(%rsp),%r13
   d:	45 31 e4             	xor    %r12d,%r12d
  10:	e9 38 fd ff ff       	jmp    0xfffffffffffffd4d
  15:	48                   	rex.W
[ 1175.489551][    C3] RSP: 0018:ffa0000000280868 EFLAGS: 00010293
[ 1175.489737][    C3] RAX: ff1100000c520424 RBX: ff1100000d1e78c0 RCX: 0000000000000000
[ 1175.489947][    C3] RDX: ff1100000c520440 RSI: ff1100000c52042c RDI: fffffffffffffff8
[ 1175.490160][    C3] RBP: ff1100000c520400 R08: ff1100000c52042c R09: 00000000000003e8
[ 1175.490378][    C3] R10: ffffffffb3d35c00 R11: 0000000000000001 R12: 0000000000000000
[ 1175.490592][    C3] R13: ff1100000d1e7980 R14: ff1100000c520440 R15: ff1100000c52042c
[ 1175.490811][    C3] FS:  00007fea1d049c80(0000) GS:ff1100008332b000(0000) knlGS:0000000000000000
[ 1175.491060][    C3] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1175.491247][    C3] CR2: 00005634d9b8e680 CR3: 000000000a360005 CR4: 0000000000771ef0
[ 1175.491462][    C3] PKRU: 55555554
[ 1175.491569][    C3] Call Trace:
[ 1175.491682][    C3]  <IRQ>
[ 1175.491759][    C3]  ? udp_err (net/ipv4/udp.c:926 (discriminator 1))
[ 1175.491867][    C3]  udp_err (net/ipv4/udp.c:933)
[ 1175.491975][    C3]  icmp_unreach (net/ipv4/icmp.c:1196)
[ 1175.492119][    C3]  ? __skb_checksum_complete (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:170 ./include/linux/skbuff.h:2112 net/core/skbuff.c:3785)
[ 1175.492268][    C3]  icmp_rcv (net/ipv4/icmp.c:1525 (discriminator 1))
[ 1175.492376][    C3]  ip_protocol_deliver_rcu (net/ipv4/ip_input.c:209)
[ 1175.492518][    C3]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6671 (discriminator 2))
[ 1175.492665][    C3]  ip_local_deliver_finish (./include/linux/rcupdate.h:867 net/ipv4/ip_input.c:242)
[ 1175.492805][    C3]  ip_local_deliver (net/ipv4/ip_input.c:259)
[ 1175.492945][    C3]  ? ip_local_deliver_finish (net/ipv4/ip_input.c:251)
[ 1175.493091][    C3]  ? ip_rcv_finish_core (./include/net/net_namespace.h:419 (discriminator 7) ./include/linux/netdevice.h:2747 (discriminator 7) net/ipv4/ip_input.c:414 (discriminator 7))
[ 1175.493236][    C3]  ? __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))
[ 1175.493382][    C3]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6671 (discriminator 2))
[ 1175.493522][    C3]  ip_rcv (./include/linux/netfilter.h:318 ./include/linux/netfilter.h:312 net/ipv4/ip_input.c:612)
[ 1175.493633][    C3]  ? ip_local_deliver (net/ipv4/ip_input.c:605)
[ 1175.493776][    C3]  ? mark_usage (kernel/locking/lockdep.c:4674 (discriminator 1))
[ 1175.493916][    C3]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1175.494055][    C3]  ? up_read_non_owner (kernel/locking/rwsem.c:1775 (discriminator 12))
[ 1175.494200][    C3]  __netif_receive_skb_one_core (net/core/dev.c:6202)
[ 1175.494380][    C3]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[ 1175.494522][    C3]  ? __netif_receive_skb_list_core (net/core/dev.c:6202)
[ 1175.494701][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1175.494843][    C3]  process_backlog (./include/linux/rcupdate.h:867 net/core/dev.c:6674)
[ 1175.494986][    C3]  __napi_poll (net/core/dev.c:7737)
[ 1175.495094][    C3]  net_rx_action (net/core/dev.c:7800 net/core/dev.c:7957)
[ 1175.495242][    C3]  ? __napi_poll (net/core/dev.c:7919)
[ 1175.495381][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[ 1175.495527][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1175.495673][    C3]  handle_softirqs (./arch/x86/include/asm/jump_label.h:37 ./include/trace/events/irq.h:142 kernel/softirq.c:623)
[ 1175.495813][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1175.495954][    C3]  ? _local_bh_enable (kernel/softirq.c:580)
[ 1175.496097][    C3]  ? trace_csd_function_exit (./include/trace/events/csd.h:64 (discriminator 24))
[ 1175.496244][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1175.496384][    C3]  do_softirq (kernel/softirq.c:523 (discriminator 19) kernel/softirq.c:510 (discriminator 19))
[ 1175.496489][    C3]  </IRQ>
[ 1175.496560][    C3]  <TASK>
[ 1175.496634][    C3]  ? __dev_queue_xmit (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:909 (discriminator 2) net/core/dev.c:4905 (discriminator 2))
[ 1175.496775][    C3]  __local_bh_enable_ip (kernel/softirq.c:450)
[ 1175.496915][    C3]  __dev_queue_xmit (net/core/dev.c:4906)
[ 1175.497054][    C3]  ? _copy_from_iter (./arch/x86/include/asm/smap.h:47 ./arch/x86/include/asm/uaccess_64.h:121 ./arch/x86/include/asm/uaccess_64.h:141 lib/iov_iter.c:67 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:302 ./include/linux/iov_iter.h:330 lib/iov_iter.c:261 lib/iov_iter.c:272)
[ 1175.497200][    C3]  ? __alloc_skb (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:408 net/core/skbuff.c:720)
[ 1175.497348][    C3]  ? napi_skb_cache_get (net/core/skbuff.c:674)
[ 1175.497488][    C3]  ? _copy_from_iter_flushcache (lib/iov_iter.c:266)
[ 1175.497670][    C3]  ? ref_tracker_get_stats (lib/ref_tracker.c:84)
[ 1175.497813][    C3]  ? netdev_core_pick_tx (net/core/dev.c:4767)
[ 1175.497959][    C3]  ? packet_release (net/packet/af_packet.c:1924)
[ 1175.498109][    C3]  packet_snd (net/packet/af_packet.c:3077 (discriminator 1))
[ 1175.498259][    C3]  ? tpacket_snd (net/packet/af_packet.c:2941)
[ 1175.498399][    C3]  ? __might_fault (mm/memory.c:7230 (discriminator 6))
[ 1175.498544][    C3]  ? __might_fault (mm/memory.c:7230 (discriminator 6))
[ 1175.498691][    C3]  ? __might_fault (mm/memory.c:7230 (discriminator 6))
[ 1175.498831][    C3]  __sys_sendto (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2265 (discriminator 4))
[ 1175.498975][    C3]  ? __ia32_sys_getpeername (net/socket.c:2232)
[ 1175.499124][    C3]  ? sock_ioctl (net/socket.c:1435)
[ 1175.499275][    C3]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1480 arch/x86/mm/fault.c:1527)
[ 1175.499420][    C3]  __x64_sys_sendto (net/socket.c:2272 (discriminator 1) net/socket.c:2268 (discriminator 1) net/socket.c:2268 (discriminator 1))
[ 1175.499561][    C3]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[ 1175.499764][    C3]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473)
[ 1175.499904][    C3]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:187 arch/x86/entry/syscall_64.c:89)
[ 1175.500046][    C3]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[ 1175.500190][    C3]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:106 (discriminator 9))
[ 1175.500335][    C3]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[ 1175.500476][    C3]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1175.500659][    C3] RIP: 0033:0x7fea1d20822e
[ 1175.500810][    C3] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[ 1175.501329][    C3] RSP: 002b:00007ffc47bf4770 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[ 1175.501544][    C3] RAX: ffffffffffffffda RBX: 000056350881ae82 RCX: 00007fea1d20822e
[ 1175.501761][    C3] RDX: 00000000000003c5 RSI: 000056350881ae82 RDI: 0000000000000005
[ 1175.501973][    C3] RBP: 00007ffc47bf4780 R08: 00007ffc47bf47d0 R09: 0000000000000014
[ 1175.502191][    C3] R10: 0000000000000000 R11: 0000000000000202 R12: 000056350881a830


Finger prints:
__udp4_lib_err_encap:udp_err:icmp_unreach:icmp_rcv:ip_protocol_deliver_rcu