======================================
| # TEST: Block excluded source - second VTEP                           [ OK ]
| [ 2026.194750][    C0] ------------[ cut here ]------------
| [ 2026.195171][    C0] UBSAN: invalid-load in ./include/linux/skbuff.h:4267:9
| [ 2026.195541][    C0] load of value 107 is not a valid value for type '_Bool'
[ 2026.196342][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 2026.196973][    C0] Call Trace:
[ 2026.197155][    C0]  <IRQ>
[ 2026.197312][ C0] dump_stack_lvl (lib/dump_stack.c:107) 
[ 2026.197561][ C0] __ubsan_handle_load_invalid_value (lib/ubsan.c:218 lib/ubsan.c:419) 
[ 2026.197896][ C0] skb_scrub_packet.cold (./include/linux/skbuff.h:4267 net/core/skbuff.c:6030) 
[ 2026.198173][ C0] __dev_forward_skb2 (./include/linux/netdevice.h:4115 net/core/dev.c:2135) 
[ 2026.198445][ C0] veth_xmit (drivers/net/veth.c:319 drivers/net/veth.c:374) 
[ 2026.198681][ C0] dev_hard_start_xmit (./include/linux/netdevice.h:4991 ./include/linux/netdevice.h:5005 net/core/dev.c:3530 net/core/dev.c:3546) 
[ 2026.198963][ C0] __dev_queue_xmit (./include/linux/netdevice.h:3369 net/core/dev.c:4338) 
[ 2026.199227][ C0] ? __pfx_do_raw_write_trylock (kernel/locking/spinlock_debug.c:216) 
[ 2026.199535][ C0] ? eth_header (net/ethernet/eth.c:100) 
[ 2
DETECTED CRASH, lowering timeout
026.199781][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4246) 
[ 2026.200065][ C0] ? neigh_resolve_output (./include/linux/netdevice.h:3226 net/core/neighbour.c:1558 net/core/neighbour.c:1543) 
[ 2026.200354][ C0] ? __neigh_update (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/neighbour.c:1446) 
[ 2026.200625][ C0] __neigh_update (net/core/neighbour.c:1461) 
[ 2026.200899][ C0] arp_process (./include/linux/instrumented.h:96 (discriminator 4) ./include/linux/atomic/atomic-instrumented.h:400 (discriminator 4) ./include/linux/refcount.h:261 (discriminator 4) ./include/linux/refcount.h:304 (discriminator 4) ./include/linux/refcount.h:322 (discriminator 4) ./include/net/neighbour.h:444 (discriminator 4) net/ipv4/arp.c:934 (discriminator 4)) 
[ 2026.201151][ C0] ? __pfx_arp_process (net/ipv4/arp.c:699) 
[ 2026.201427][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 2026.201707][ C0] ? __pfx_arp_rcv (net/ipv4/arp.c:965) 
[ 2026.201951][ C0] __netif_receive_skb_one_core (net/core/dev.c:5554 (discriminator 5)) 
[ 2026.202264][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5547) 
[ 2026.202600][ C0] ? __pfx_do_raw_spin_trylock (kernel/locking/spinlock_debug.c:122) 
[ 2026.202902][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 2026.203148][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:5995) 
[ 2026.203417][ C0] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:5997) 
[ 2026.203679][ C0] __napi_poll.constprop.0 (net/core/dev.c:6625) 
[ 2026.203968][ C0] net_rx_action (net/core/dev.c:6694 net/core/dev.c:6827) 
[ 2026.204229][ C0] ? __pfx_net_rx_action (net/core/dev.c:6791) 
[ 2026.204498][ C0] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 2026.204773][ C0] ? ktime_get (kernel/time/timekeeping.c:195 (discriminator 4) kernel/time/timekeeping.c:289 (discriminator 4) kernel/time/timekeeping.c:388 (discriminator 4) kernel/time/timekeeping.c:848 (discriminator 4)) 
[ 2026.205004][ C0] ? hrtimer_interrupt (kernel/time/hrtimer.c:1828) 
[ 2026.205283][ C0] ? hrtimer_interrupt (kernel/time/hrtimer.c:1828) 
[ 2026.205561][ C0] __do_softirq (kernel/softirq.c:553) 
[ 2026.205812][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 2026.206086][ C0] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[ 2026.206310][    C0]  </IRQ>
[ 2026.206467][    C0]  <TASK>
[ 2026.206626][ C0] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 2026.206898][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 2026.207167][ C0] __dev_queue_xmit (net/core/dev.c:4365) 
[ 2026.207430][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 2026.207705][ C0] ? ip_finish_output2 (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/ipv4/ip_output.c:228) 
[ 2026.207986][ C0] ? eth_header (net/ethernet/eth.c:100) 
[ 2026.208228][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4246) 
[ 2026.208529][ C0] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 2026.208804][ C0] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 2026.209100][ C0] ? __ip_finish_output (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4943 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 2026.209380][ C0] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 2026.209608][ C0] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 2026.209858][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 2026.210108][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 2026.210370][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 2026.210723][ C0] NF_HOOK.constprop.0 (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4993 net/ipv4/ip_forward.c:99) 
[ 2026.210997][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 2026.211303][ C0] ? __get_random_u32_below (drivers/char/random.c:557) 
[ 2026.211593][ C0] ? __ip_select_ident (./arch/x86/include/asm/atomic.h:85 ./include/linux/atomic/atomic-arch-fallback.h:564 ./include/linux/atomic/atomic-instrumented.h:124 net/ipv4/route.c:480 net/ipv4/route.c:496) 
[ 2026.211872][ C0] raw_send_hdrinc (net/ipv4/raw.c:408) 
[ 2026.212142][ C0] ? __pfx_raw_send_hdrinc (net/ipv4/raw.c:323) 
[ 2026.212420][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 2026.212689][ C0] raw_sendmsg (net/ipv4/raw.c:634) 
[ 2026.212944][ C0] ? __pfx_raw_sendmsg (net/ipv4/raw.c:476) 
[ 2026.213225][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 2026.213469][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 2026.213732][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 2026.214006][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 2026.214242][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 2026.214490][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 2026.214742][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 2026.215006][ C0] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 2026.215249][ C0] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 2026.215516][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1366) 
[ 2026.215815][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 2026.216069][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 2026.216332][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 2026.216607][ C0] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2735 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3289 kernel/locking/rwsem.c:1347) 
[ 2026.216848][ C0] ? __pfx___up_read (kernel/locking/rwsem.c:1339) 
[ 2026.217106][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[ 2026.217390][ C0] __x64_sys_sendto (net/socket.c:2199) 
[ 2026.217644][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 2026.217992][ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 2026.218236][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 2026.218548][    C0] RIP: 0033:0x7fd3ab4f385a
[ 2026.218786][ C0] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[ 2026.219785][    C0] RSP: 002b:00007ffc326b75f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 2026.220226][    C0] RAX: ffffffffffffffda RBX: 00000000011b59d0 RCX: 00007fd3ab4f385a
[ 2026.220642][    C0] RDX: 0000000000000080 RSI: 00000000011b5c90 RDI: 0000000000000005
[ 2026.221054][    C0] RBP: 00000000011b59d0 R08: 00007ffc326b7600 R09: 0000000000000010
[ 2026.221465][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000080
[ 2026.221876][    C0] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
| # ----------------------------------------------------------
| [ 3119.468606][    C0] ------------[ cut here ]------------
| [ 3119.469040][    C0] UBSAN: invalid-load in ./include/linux/skbuff.h:4267:9
| [ 3119.469428][    C0] load of value 107 is not a valid value for type '_Bool'
[ 3119.470226][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 3119.470889][    C0] Call Trace:
[ 3119.471069][    C0]  <IRQ>
[ 3119.471221][ C0] dump_stack_lvl (lib/dump_stack.c:107) 
[ 3119.471476][ C0] __ubsan_handle_load_invalid_value (lib/ubsan.c:218 lib/ubsan.c:419) 
[ 3119.471807][ C0] ip_forward_finish.cold (./include/linux/skbuff.h:4267 net/ipv4/ip_forward.c:79) 
[ 3119.472093][ C0] NF_HOOK.constprop.0 (./include/linux/netfilter.h:314) 
[ 3119.472362][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 3119.472658][ C0] ? ip_dst_mtu_maybe_forward.constprop.0 (./include/net/net_namespace.h:383 ./include/linux/netdevice.h:2654 ./include/net/ip.h:465) 
[ 3119.473025][ C0] ? ip_forward (net/ipv4/ip_forward.c:45 net/ipv4/ip_forward.c:135) 
[ 3119.473283][ C0] ip_rcv (./include/net/dst.h:460 ./include/net/dst.h:458 net/ipv4/ip_input.c:449 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[ 3119.473500][ C0] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 3119.473754][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 3119.474034][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:5995) 
[ 3119.474305][ C0] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 3119.474551][ C0] __netif_receive_skb_one_core (net/core/dev.c:5554 (discriminator 4)) 
[ 3119.474867][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5547) 
[ 3119.475208][ C0] ? __pfx_do_raw_spin_trylock (kernel/locking/spinlock_debug.c:122) 
[ 3119.475517][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3119.475769][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:5995) 
[ 3119.476036][ C0] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:5997) 
[ 3119.476291][ C0] __napi_poll.constprop.0 (net/core/dev.c:6625) 
[ 3119.476580][ C0] net_rx_action (net/core/dev.c:6694 net/core/dev.c:6827) 
[ 3119.476839][ C0] ? __pfx_net_rx_action (net/core/dev.c:6791) 
[ 3119.477116][ C0] ? handle_irq_event (kernel/irq/internals.h:234 kernel/irq/handle.c:213) 
[ 3119.477396][ C0] __do_softirq (kernel/softirq.c:553) 
[ 3119.477642][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 3119.477913][ C0] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[ 3119.478133][    C0]  </IRQ>
[ 3119.478291][    C0]  <TASK>
[ 3119.478447][ C0] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 3119.478714][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 3119.478982][ C0] __dev_queue_xmit (net/core/dev.c:4365) 
[ 3119.479255][ C0] ? __pfx_do_raw_write_trylock (kernel/locking/spinlock_debug.c:216) 
[ 3119.479560][ C0] ? eth_header (net/ethernet/eth.c:100) 
[ 3119.479801][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4246) 
[ 3119.480097][ C0] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 3119.480369][ C0] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 3119.480670][ C0] ? __ip_finish_output (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4943 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 3119.480948][ C0] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 3119.481173][ C0] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 3119.481424][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3119.481680][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3119.481938][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 3119.482287][ C0] NF_HOOK.constprop.0 (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4993 net/ipv4/ip_forward.c:99) 
[ 3119.482561][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 3119.482860][ C0] ? __get_random_u32_below (drivers/char/random.c:557) 
[ 3119.483147][ C0] ? __ip_select_ident (./arch/x86/include/asm/atomic.h:85 ./include/linux/atomic/atomic-arch-fallback.h:564 ./include/linux/atomic/atomic-instrumented.h:124 net/ipv4/route.c:480 net/ipv4/route.c:496) 
[ 3119.483422][ C0] raw_send_hdrinc (net/ipv4/raw.c:408) 
[ 3119.483696][ C0] ? __pfx_raw_send_hdrinc (net/ipv4/raw.c:323) 
[ 3119.483973][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 3119.484238][ C0] raw_sendmsg (net/ipv4/raw.c:634) 
[ 3119.484489][ C0] ? __pfx_raw_sendmsg (net/ipv4/raw.c:476) 
[ 3119.484767][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 3119.485006][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 3119.485265][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 3119.485548][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 3119.485780][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3119.486031][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3119.486282][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3119.486542][ C0] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 3119.486782][ C0] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 3119.487046][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1366) 
[ 3119.487338][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 3119.487579][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 3119.487837][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 3119.488110][ C0] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2735 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3289 kernel/locking/rwsem.c:1347) 
[ 3119.488347][ C0] ? __pfx___up_read (kernel/locking/rwsem.c:1339) 
[ 3119.488605][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[ 3119.488885][ C0] __x64_sys_sendto (net/socket.c:2199) 
[ 3119.489138][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 3119.489483][ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 3119.489725][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 3119.490035][    C0] RIP: 0033:0x7fe75480a85a
[ 3119.490279][ C0] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[ 3119.491284][    C0] RSP: 002b:00007ffff8b18e18 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 3119.491720][    C0] RAX: ffffffffffffffda RBX: 0000000000e479d0 RCX: 00007fe75480a85a
[ 3119.492149][    C0] RDX: 0000000000000080 RSI: 0000000000e47c90 RDI: 0000000000000005
[ 3119.492558][    C0] RBP: 0000000000e479d0 R08: 00007ffff8b18e20 R09: 0000000000000010
[ 3119.492965][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000080
[ 3119.493372][    C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
| # ----------------------------------------------------------
| [ 3253.433921][    C0] ------------[ cut here ]------------
| [ 3253.434351][    C0] UBSAN: invalid-load in ./include/linux/skbuff.h:4267:9
| [ 3253.434817][    C0] load of value 107 is not a valid value for type '_Bool'
[ 3253.435641][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 3253.436267][    C0] Call Trace:
[ 3253.436443][    C0]  <IRQ>
[ 3253.436596][ C0] dump_stack_lvl (lib/dump_stack.c:107) 
[ 3253.436848][ C0] __ubsan_handle_load_invalid_value (lib/ubsan.c:218 lib/ubsan.c:419) 
[ 3253.437178][ C0] ip6_forward.cold (./include/linux/skbuff.h:4267 net/ipv6/ip6_output.c:471 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_output.c:660) 
[ 3253.437442][ C0] ? __pfx_ip6_forward (net/ipv6/ip6_output.c:494) 
[ 3253.437703][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 3253.437982][ C0] ? udp_v6_early_demux (net/ipv6/udp.c:1067 net/ipv6/udp.c:1097) 
[ 3253.438294][ C0] ? ipv6_rcv (./include/net/dst.h:460 ./include/net/dst.h:458 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310) 
[ 3253.438529][ C0] ipv6_rcv (./include/net/dst.h:460 ./include/net/dst.h:458 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310) 
[ 3253.438752][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 3253.439007][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 3253.439280][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:5995) 
[ 3253.439545][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) 
[ 3253.439836][ C0] __netif_receive_skb_one_core (net/core/dev.c:5547) 
[ 3253.440147][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5547) 
[ 3253.440486][ C0] ? __pfx_do_raw_spin_trylock (kernel/locking/spinlock_debug.c:122) 
[ 3253.440785][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3253.441031][ C0] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:5995) 
[ 3253.441317][ C0] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:5997) 
[ 3253.441575][ C0] __napi_poll.constprop.0 (net/core/dev.c:6625) 
[ 3253.441861][ C0] net_rx_action (net/core/dev.c:6694 net/core/dev.c:6827) 
[ 3253.442116][ C0] ? __pfx_net_rx_action (net/core/dev.c:6791) 
[ 3253.442384][ C0] ? handle_irq_event (kernel/irq/internals.h:234 kernel/irq/handle.c:213) 
[ 3253.442666][ C0] __do_softirq (kernel/softirq.c:553) 
[ 3253.442907][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 3253.443185][ C0] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[ 3253.443407][    C0]  </IRQ>
[ 3253.443562][    C0]  <TASK>
[ 3253.443725][ C0] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 3253.443993][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4364) 
[ 3253.444261][ C0] __dev_queue_xmit (net/core/dev.c:4365) 
[ 3253.444526][ C0] ? __pfx_do_raw_write_trylock (kernel/locking/spinlock_debug.c:216) 
[ 3253.444827][ C0] ? eth_header (net/ethernet/eth.c:100) 
[ 3253.445071][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4246) 
[ 3253.445365][ C0] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 3253.445638][ C0] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 3253.445925][ C0] ? __ip_finish_output (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4943 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 3253.446208][ C0] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 3253.446436][ C0] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 3253.446684][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3253.446935][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3253.447196][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 3253.447549][ C0] NF_HOOK.constprop.0 (./include/linux/skbuff.h:1627 ./include/linux/skbuff.h:4993 net/ipv4/ip_forward.c:99) 
[ 3253.447820][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 3253.448123][ C0] ? __get_random_u32_below (drivers/char/random.c:557) 
[ 3253.448407][ C0] ? __ip_select_ident (./arch/x86/include/asm/atomic.h:85 ./include/linux/atomic/atomic-arch-fallback.h:564 ./include/linux/atomic/atomic-instrumented.h:124 net/ipv4/route.c:480 net/ipv4/route.c:496) 
[ 3253.448681][ C0] raw_send_hdrinc (net/ipv4/raw.c:408) 
[ 3253.448952][ C0] ? __pfx_raw_send_hdrinc (net/ipv4/raw.c:323) 
[ 3253.449228][ C0] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 3253.449497][ C0] raw_sendmsg (net/ipv4/raw.c:634) 
[ 3253.449760][ C0] ? __pfx_raw_sendmsg (net/ipv4/raw.c:476) 
[ 3253.450039][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 3253.450277][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 3253.450537][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 3253.450808][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 3253.451042][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 3253.451287][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3253.451537][ C0] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 3253.451796][ C0] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 3253.452040][ C0] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 3253.452320][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1366) 
[ 3253.452610][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 3253.452852][ C0] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 3253.453110][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 3253.453382][ C0] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2735 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3289 kernel/locking/rwsem.c:1347) 
[ 3253.453619][ C0] ? __pfx___up_read (kernel/locking/rwsem.c:1339) 
[ 3253.453883][ C0] ? do_user_addr_fault (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[ 3253.454163][ C0] __x64_sys_sendto (net/socket.c:2199) 
[ 3253.454416][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 3253.454757][ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 3253.455002][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 3253.455311][    C0] RIP: 0033:0x7fdaf787b85a
[ 3253.455547][ C0] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[ 3253.456535][    C0] RSP: 002b:00007ffe38e2ae68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 3253.456974][    C0] RAX: ffffffffffffffda RBX: 0000000001c5f9d0 RCX: 00007fdaf787b85a
[ 3253.457384][    C0] RDX: 0000000000000080 RSI: 0000000001c5fc90 RDI: 0000000000000005
[ 3253.457790][    C0] RBP: 0000000001c5f9d0 R08: 00007ffe38e2ae70 R09: 0000000000000010
[ 3253.458198][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000080


Finger prints:
dump_stack_lvl:__ubsan_handle_load_invalid_value:__dev_forward_skb2:veth_xmit
dump_stack_lvl:__ubsan_handle_load_invalid_value:ip_rcv:__netif_receive_skb_one_core
dump_stack_lvl:__ubsan_handle_load_invalid_value:ipv6_rcv:__netif_receive_skb_one_core