======================================
| # seed = 1708047198
| [  730.715769][ T4675] ------------[ cut here ]------------
| [  730.716199][ T4675] UBSAN: invalid-load in ./include/linux/skbuff.h:4267:9
| [  730.716607][ T4675] load of value 107 is not a valid value for type '_Bool'
[  730.717432][ T4675] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  730.718088][ T4675] Call Trace:
[  730.718279][ T4675]  <TASK>
[ 730.718457][ T4675] dump_stack_lvl (lib/dump_stack.c:107) 
[ 730.718706][ T4675] __ubsan_handle_load_invalid_value (lib/ubsan.c:218 lib/ubsan.c:419) 
[ 730.719073][ T4675] loopback_xmit.cold (./include/linux/skbuff.h:4267 drivers/net/loopback.c:77) 
[ 730.719365][ T4675] dev_hard_start_xmit (./include/linux/netdevice.h:4991 ./include/linux/netdevice.h:5005 net/core/dev.c:3530 net/core/dev.c:3546) 
[ 730.719659][ T4675] __dev_queue_xmit (./include/linux/netdevice.h:3369 net/core/dev.c:4338) 
[ 730.719927][ T4675] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 730.720239][ T4675] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 730.720598][ T4675] ? __pfx___dev_queue_xmit (net/core/dev.c:4246) 
[  730.720910][
DETECTED CRASH, lowering timeout
T4675] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 730.721198][ T4675] ? ip6_copy_metadata (./arch/x86/include/asm/atomic.h:97 ./include/linux/atomic/atomic-arch-fallback.h:749 ./include/linux/atomic/atomic-instrumented.h:253 ./include/linux/refcount.h:182 ./include/linux/refcount.h:239 ./include/linux/refcount.h:256 ./include/linux/netfilter/nf_conntrack_common.h:42 ./include/linux/skbuff.h:4839 ./include/linux/skbuff.h:4853 net/ipv6/ip6_output.c:687) 
[ 730.721472][ T4675] ip6_fragment (net/ipv6/ip6_output.c:959) 
[ 730.721736][ T4675] ? __pfx_ip6_finish_output2 (net/ipv6/ip6_output.c:61) 
[ 730.722064][ T4675] ? __pfx_ip6_fragment (net/ipv6/ip6_output.c:857) 
[ 730.722365][ T4675] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 730.722628][ T4675] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 730.722886][ T4675] ? ip6_dst_mtu_maybe_forward.constprop.0 (./include/net/ip6_route.h:335) 
[ 730.723308][ T4675] ip6_finish_output (net/ipv6/ip6_output.c:209 net/ipv6/ip6_output.c:222) 
[ 730.723603][ T4675] ? ip6_output (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/linux/netfilter.h:271 ./include/linux/netfilter.h:302 net/ipv6/ip6_output.c:243) 
[ 730.723844][ T4675] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 730.724074][ T4675] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 730.724343][ T4675] ? __pfx_ip6_finish_output (net/ipv6/ip6_output.c:215) 
[ 730.724629][ T4675] ? __pfx_ipv6_conntrack_local (net/netfilter/nf_conntrack_proto.c:620) nf_conntrack
[ 730.725035][ T4675] ? NF_HOOK.constprop.0 (./include/linux/rcupdate.h:751 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 730.725329][ T4675] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 730.725592][ T4675] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 730.725883][ T4675] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 730.726189][ T4675] ? __pfx_dst_output (./include/net/dst.h:449) 
[ 730.726452][ T4675] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 730.726696][ T4675] ? rawv6_send_hdrinc (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/ipv6/raw.c:654) 
[ 730.726972][ T4675] rawv6_send_hdrinc (net/ipv6/raw.c:658 (discriminator 60)) 
[ 730.727298][ T4675] ? __pfx_rawv6_send_hdrinc (net/ipv6/raw.c:590) 
[ 730.727597][ T4675] ? ip6_dst_hoplimit.part.0.isra.0 (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/ipv6/output_core.c:117) 
[ 730.727926][ T4675] rawv6_sendmsg (net/ipv6/raw.c:909) 
[ 730.728195][ T4675] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:736) 
[ 730.728465][ T4675] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 730.728750][ T4675] ? 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) 
[ 730.729017][ T4675] ? 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) 
[ 730.729289][ T4675] ? __lock_release (kernel/locking/lockdep.c:353 kernel/locking/lockdep.c:5436) 
[ 730.729581][ T4675] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 730.729843][ T4675] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 730.730111][ T4675] ? __might_fault (mm/memory.c:6060 mm/memory.c:6053) 
[ 730.730401][ T4675] ? __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 730.730659][ T4675] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) 
[ 730.730916][ T4675] ? __pfx___sys_sendto (net/socket.c:2161) 
[ 730.731223][ T4675] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 730.731518][ T4675] ? rseq_ip_fixup (kernel/rseq.c:257 kernel/rseq.c:291) 
[ 730.731782][ T4675] ? __pfx_rseq_ip_fixup (kernel/rseq.c:275) 
[ 730.732069][ T4675] ? __pfx_task_work_run (kernel/task_work.c:148) 
[ 730.732367][ T4675] ? __pfx___sys_socket (net/socket.c:1702) 
[ 730.732648][ T4675] ? rseq_update_cpu_node_id (./include/trace/events/rseq.h:11 kernel/rseq.c:108) 
[ 730.732962][ T4675] __x64_sys_sendto (net/socket.c:2199) 
[ 730.733242][ T4675] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 730.733607][ T4675] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 730.733846][ T4675] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[  730.734180][ T4675] RIP: 0033:0x7ff78e57985a
[ 730.734436][ T4675] 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
[  730.735478][ T4675] RSP: 002b:00007ffec2163518 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[  730.735925][ T4675] RAX: ffffffffffffffda RBX: 00007ffec2163600 RCX: 00007ff78e57985a
[  730.736370][ T4675] RDX: 0000000000000038 RSI: 00000000004077e0 RDI: 0000000000000005
[  730.736809][ T4675] RBP: 0000000000000005 R08: 00007ffec2163600 R09: 000000000000001c
[  730.737244][ T4675] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001c


Finger prints:
dump_stack_lvl:__ubsan_handle_load_invalid_value:dev_hard_start_xmit:__dev_queue_xmit