======================================
| xx__-> [    8.731369][  T129] ------------[ cut here ]------------
| [    8.731650][  T129] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: tc/129
| [    8.731893][  T129] Modules linked in:
| [    8.732335][  T129] Tainted: [W]=WARN
[    8.732450][  T129] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.732706][  T129] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.732889][  T129] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 c8 c5 f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c604
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c5da
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.733370][  T129] RSP: 0018:ffa0000000507aa8 EFLAGS: 00010286
[    8.733549][  T129] RAX: 00000000ffffffa6 RBX: ff1100000a0b7540 RCX: 1ff40000000a0f1b
[    8.733761][  T129] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000a0b75f0
[    8.733961][  T129] RBP: ff110000084d1000 R08: 1fe2200001416ebf R09: ff1100000bf1d180
[    8.734161][  T129] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.734361][  T129] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000084d1000
[    8.734573][  T129] FS:  00007f7d33284c00(0000) GS:ff11000099bbb000(0000) knlGS:0000000000000000
[    8.734837][  T129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.735007][  T129] CR2: 00007f7d3337ebc0 CR3: 00000000091cf001 CR4: 0000000000771ef0
[    8.735208][  T129] PKRU: 55555554
[    8.735309][  T129] Call Trace:
[    8.735417][  T129]  <TASK>
[    8.735487][  T129]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.735634][  T129]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.735770][  T129]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.735907][  T129]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.736010][  T129]  register_netdevice (net/core/dev.c:11488)
[    8.736145][  T129]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.736314][  T129]  register_netdev (net/core/dev.c:11552)
[    8.736454][  T129]  loopback_net_init (drivers/net/loopback.c:218)
[    8.736595][  T129]  ops_init (net/core/net_namespace.c:137)
[    8.736707][  T129]  setup_net (net/core/net_namespace.c:446)
[    8.736809][  T129]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.736957][  T129]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.737093][  T129]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.737251][  T129]  copy_net_ns (net/core/net_namespace.c:579)
[    8.737396][  T129]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.737535][  T129]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.737675][  T129]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[    8.737809][  T129]  ksys_unshare (kernel/fork.c:3243)
[    8.737942][  T129]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    8.738077][  T129]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.738209][  T129]  ? exc_page_fault (arch/x86/mm/fault.c:1474 arch/x86/mm/fault.c:1527)
[    8.738345][  T129]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.738486][  T129]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.738644][  T129]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.738779][  T129]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.738913][  T129]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.739049][  T129]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.739182][  T129]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.739348][  T129] RIP: 0033:0x7f7d3337ebcb
[    8.739496][  T129] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.739996][  T129] RSP: 002b:00007ffc371e8748 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
[    8.740197][  T129] RAX: ffffffffffffffda RBX: 00000f6fa62fa000 RCX: 00007f7d3337ebcb
[    8.740400][  T129] RDX: 0000000000000028 RSI: 00000000000000f3 RDI: 0000000040000000
[    8.740612][  T129] RBP: 00007b7d317d0000 R08: 00007f7d333eaf00 R09: 00000000000000f3
[    8.740826][  T129] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f7d32e9d000
[    8.741054][  T129] R13: 00007b7d314d01c0 R14: 00007b7d317d02c0 R15: 00007f7d32e9d000
| [    8.811872][   T12] ------------[ cut here ]------------
| [    8.812066][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#0: 0/12
| [    8.812317][   T12] Modules linked in: sch_fq_codel
| [    8.812789][   T12] Tainted: [W]=WARN
[    8.812891][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.813050][   T12] Workqueue: netns cleanup_net
[    8.813190][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.813353][   T12] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 c8 c5 f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c604
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c5da
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.813858][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[    8.814020][   T12] RAX: 00000000ffffffa6 RBX: ff1100000a0b7cc0 RCX: 1ff4000000018ed5
[    8.814208][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000a0b7d70
[    8.814400][   T12] RBP: ff110000084d1000 R08: 1fe2200001416faf R09: ff11000001b051d0
[    8.814617][   T12] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff
[    8.814846][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[    8.815038][   T12] FS:  0000000000000000(0000) GS:ff11000099bbb000(0000) knlGS:0000000000000000
[    8.815279][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.815441][   T12] CR2: 0000100006e35000 CR3: 0000000018139002 CR4: 0000000000771ef0
[    8.815640][   T12] PKRU: 55555554
[    8.815736][   T12] Call Trace:
[    8.815830][   T12]  <TASK>
[    8.815896][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[    8.816075][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[    8.816244][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[    8.816371][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[    8.816506][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[    8.816651][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[    8.816779][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[    8.816902][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[    8.817026][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[    8.817155][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[    8.817284][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[    8.817417][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    8.817547][   T12]  cleanup_net (net/core/net_namespace.c:702)
[    8.817683][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[    8.817891][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[    8.818018][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[    8.818142][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.818271][   T12]  process_one_work (kernel/workqueue.c:3314)
[    8.818407][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[    8.818532][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    8.818670][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[    8.818800][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[    8.818925][   T12]  kthread (kernel/kthread.c:436)
[    8.819021][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[    8.819176][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[    8.819300][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[    8.819434][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[    8.819593][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[    8.819804][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[    8.819928][   T12]  ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
| [    8.829048][  T132] ------------[ cut here ]------------
| [    8.829207][  T132] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#1: tc/132
| [    8.829454][  T132] Modules linked in: sch_fq_codel
| [    8.829889][  T132] Tainted: [W]=WARN
[    8.829995][  T132] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.830205][  T132] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.830874][  T132] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 c8 c5 f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c604
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c5da
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.831371][  T132] RSP: 0018:ffa0000000607aa8 EFLAGS: 00010286
[    8.831550][  T132] RAX: 00000000ffffffa6 RBX: ff11000004b00dc0 RCX: 1ff40000000c0f1b
[    8.831764][  T132] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000004b00e70
[    8.831965][  T132] RBP: ff1100000c3e1000 R08: 1fe22000009601cf R09: ff1100000d4fd180
[    8.832176][  T132] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff
[    8.832379][  T132] R13: 0000000000000000 R14: 0000000000000000 R15: ff1100000c3e1000
[    8.832590][  T132] FS:  00007f7d33284c00(0000) GS:ff11000099c3b000(0000) knlGS:0000000000000000
[    8.832837][  T132] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.833011][  T132] CR2: 00007f7d3337ebc0 CR3: 000000000d08e004 CR4: 0000000000771ef0
[    8.833216][  T132] PKRU: 55555554
[    8.833320][  T132] Call Trace:
[    8.833427][  T132]  <TASK>
[    8.833498][  T132]  ? ip6_route_dev_notify (net/ipv6/route.c:6484)
[    8.833644][  T132]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.833782][  T132]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.833929][  T132]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.834037][  T132]  register_netdevice (net/core/dev.c:11488)
[    8.834176][  T132]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.834353][  T132]  register_netdev (net/core/dev.c:11552)
[    8.834494][  T132]  loopback_net_init (drivers/net/loopback.c:218)
[    8.834642][  T132]  ops_init (net/core/net_namespace.c:137)
[    8.834747][  T132]  setup_net (net/core/net_namespace.c:446)
[    8.834850][  T132]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.834985][  T132]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.835123][  T132]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.835263][  T132]  copy_net_ns (net/core/net_namespace.c:579)
[    8.835406][  T132]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.835544][  T132]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.835688][  T132]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[    8.835822][  T132]  ksys_unshare (kernel/fork.c:3243)
[    8.835957][  T132]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    8.836094][  T132]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.836228][  T132]  ? exc_page_fault (arch/x86/mm/fault.c:1474 arch/x86/mm/fault.c:1527)
[    8.836365][  T132]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    8.836506][  T132]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.836651][  T132]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.836790][  T132]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.836926][  T132]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.837064][  T132]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.837199][  T132]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.837381][  T132] RIP: 0033:0x7f7d3337ebcb
[    8.837529][  T132] Code: 73 01 c3 48 8b 0d 2d 82 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fd 81 0f 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 2d 82 0f 00 	mov    0xf822d(%rip),%rcx        # 0xf8237
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 01 00 00       	mov    $0x110,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf8237
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d fd 81 0f 00 	mov    0xf81fd(%rip),%rcx        # 0xf820d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[    8.838019][  T132] RSP: 002b:00007ffc371e8708 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[    8.838222][  T132] RAX: ffffffffffffffda RBX: 00000f6fa62fa000 RCX: 00007f7d3337ebcb
[    8.838427][  T132] RDX: 0000000000000028 RSI: 00000000000000f3 RDI: 0000000040000000
[    8.838638][  T132] RBP: 00007b7d317d0000 R08: 00007f7d333eaf00 R09: 00000000000000f3
[    8.838841][  T132] R10: 0000000000000000 R11: 0000000000000202 R12: 00007f7d32e9c000
[    8.839065][  T132] R13: 00007b7d315d0040 R14: 00007b7d317d02c0 R15: 00007ffc371e8a90
| [    8.994472][   T12] ------------[ cut here ]------------
| [    8.994653][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 0/12
| [    8.994906][   T12] Modules linked in: act_vlan cls_flower sch_ingress sch_fq_codel
| [    8.995395][   T12] Tainted: [W]=WARN
[    8.995489][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.995655][   T12] Workqueue: netns cleanup_net
[    8.995788][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.995952][   T12] Code: 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8b 44 24 58 44 8b 48 08 e9 42 ff ff ff 90 <0f> 0b 90 ba 02 00 00 00 48 89 de 31 ff e8 c8 c5 f0 ff b9 a6 ff ff
All code
========
   0:	89 fa                	mov    %edi,%edx
   2:	48 c1 ea 03          	shr    $0x3,%rdx
   6:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   a:	48 89 f8             	mov    %rdi,%rax
   d:	83 e0 07             	and    $0x7,%eax
  10:	83 c0 03             	add    $0x3,%eax
  13:	38 d0                	cmp    %dl,%al
  15:	7c 04                	jl     0x1b
  17:	84 d2                	test   %dl,%dl
  19:	75 79                	jne    0x94
  1b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  20:	44 8b 48 08          	mov    0x8(%rax),%r9d
  24:	e9 42 ff ff ff       	jmp    0xffffffffffffff6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	ba 02 00 00 00       	mov    $0x2,%edx
  32:	48 89 de             	mov    %rbx,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c604
  3c:	b9                   	.byte 0xb9
  3d:	a6                   	cmpsb  (%rdi),(%rsi)
  3e:	ff                   	(bad)
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	ba 02 00 00 00       	mov    $0x2,%edx
   8:	48 89 de             	mov    %rbx,%rsi
   b:	31 ff                	xor    %edi,%edi
   d:	e8 c8 c5 f0 ff       	call   0xfffffffffff0c5da
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.996402][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[    8.996566][   T12] RAX: 00000000ffffffa6 RBX: ff1100000c95edc0 RCX: 1ff4000000018ed5
[    8.996778][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000c95ee70
[    8.996968][   T12] RBP: ff1100000c3e1000 R08: 1fe220000192bdcf R09: ff11000001b051d0
[    8.997160][   T12] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[    8.997347][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[    8.997539][   T12] FS:  0000000000000000(0000) GS:ff11000099d3b000(0000) knlGS:0000000000000000
[    8.997773][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.997932][   T12] CR2: 00007fe62db8b808 CR3: 0000000018139005 CR4: 0000000000771ef0
[    8.998120][   T12] PKRU: 55555554
[    8.998215][   T12] Call Trace:
[    8.998307][   T12]  <TASK>
[    8.998372][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[    8.998540][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[    8.998711][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[    8.998845][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[    8.998971][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[    8.999097][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[    8.999223][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[    8.999346][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[    8.999478][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[    8.999617][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[    8.999747][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[    8.999869][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    8.999996][   T12]  cleanup_net (net/core/net_namespace.c:702)
[    9.000120][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[    9.000245][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[    9.000373][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[    9.000505][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.000639][   T12]  process_one_work (kernel/workqueue.c:3314)
[    9.000767][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[    9.000890][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.001019][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[    9.001147][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[    9.001276][   T12]  kthread (kernel/kthread.c:436)
[    9.001369][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[    9.001528][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[    9.001659][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[    9.001785][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[    9.001938][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[    9.002066][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:register_netdev:loopback_net_init
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net