======================================
| xx__-> [    8.961722][  T176] ------------[ cut here ]------------
| [    8.962210][  T176] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#2: ip/176
| [    8.962497][  T176] Modules linked in:
| [    8.963017][  T176] Tainted: [W]=WARN
[    8.963172][  T176] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.963391][  T176] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    8.963618][  T176] 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 38 e5 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 38 e5 f0 ff       	call   0xfffffffffff0e574
  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 38 e5 f0 ff       	call   0xfffffffffff0e54a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    8.964199][  T176] RSP: 0018:ffa00000008e7ab0 EFLAGS: 00010286
[    8.964421][  T176] RAX: 00000000ffffffa6 RBX: ff1100000b0fd8c0 RCX: 1ff400000011cf1c
[    8.964667][  T176] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b0fd978
[    8.964939][  T176] RBP: ff110000028c1000 R08: 1fe220000161fb30 R09: ff1100000c1f5180
[    8.965185][  T176] R10: 0000000000000002 R11: 0000000000000001 R12: 00000000ffffffff
[    8.965430][  T176] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000028c1000
[    8.965678][  T176] FS:  00007fb208176840(0000) GS:ff11000099643000(0000) knlGS:0000000000000000
[    8.965980][  T176] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.966194][  T176] CR2: 0000000000479648 CR3: 000000000d428005 CR4: 0000000000771ef0
[    8.966496][  T176] PKRU: 55555554
[    8.966645][  T176] Call Trace:
[    8.966791][  T176]  <TASK>
[    8.966927][  T176]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    8.967113][  T176]  ? notifier_call_chain (kernel/notifier.c:85)
[    8.967299][  T176]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    8.967449][  T176]  register_netdevice (net/core/dev.c:11488)
[    8.967632][  T176]  ? unregister_netdevice_queue (./include/linux/list.h:162)
[    8.967846][  T176]  register_netdev (net/core/dev.c:11552)
[    8.968047][  T176]  loopback_net_init (drivers/net/loopback.c:218)
[    8.968230][  T176]  ops_init (net/core/net_namespace.c:137)
[    8.968379][  T176]  setup_net (net/core/net_namespace.c:446)
[    8.968532][  T176]  ? unregister_pernet_device (net/core/net_namespace.c:1503)
[    8.968712][  T176]  ? lockdep_init_map_type (kernel/locking/lockdep.c:4973)
[    8.968894][  T176]  ? mutex_init_lockdep (./include/linux/lockdep.h:135 ./include/linux/lockdep.h:142 kernel/locking/mutex.c:185)
[    8.969136][  T176]  copy_net_ns (net/core/net_namespace.c:579)
[    8.969318][  T176]  create_new_namespaces (kernel/nsproxy.c:132)
[    8.969501][  T176]  unshare_nsproxy_namespaces (kernel/nsproxy.c:234 (discriminator 4))
[    8.969683][  T176]  ksys_unshare (kernel/fork.c:3243)
[    8.969867][  T176]  ? walk_process_tree (kernel/fork.c:3036 (discriminator 19))
[    8.970065][  T176]  ? __ia32_sys_open (fs/open.c:1374)
[    8.970250][  T176]  __x64_sys_unshare (kernel/fork.c:3317 kernel/fork.c:3315 kernel/fork.c:3315)
[    8.970431][  T176]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[    8.970612][  T176]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    8.970792][  T176]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    8.970985][  T176]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    8.971167][  T176]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    8.971382][  T176] RIP: 0033:0x7fb208438bcb
[    8.971568][  T176] 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
[    8.972105][  T176] RSP: 002b:00007ffc4b07e718 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
[    8.972356][  T176] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007fb208438bcb
[    8.972600][  T176] RDX: 0000000000000000 RSI: 0000000000477309 RDI: 0000000040000000
[    8.972844][  T176] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
[    8.973105][  T176] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffc4b080940
[    8.973351][  T176] R13: 0000000000000001 R14: 00007fb2081766f8 R15: 00007ffc4b081712
| [    9.006884][  T177] ------------[ cut here ]------------
| [    9.007062][  T177] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: ip/177
| [    9.007296][  T177] Modules linked in:
| [    9.007671][  T177] Tainted: [W]=WARN
[    9.007776][  T177] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    9.007956][  T177] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[    9.008128][  T177] 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 38 e5 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 38 e5 f0 ff       	call   0xfffffffffff0e574
  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 38 e5 f0 ff       	call   0xfffffffffff0e54a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[    9.008594][  T177] RSP: 0018:ffa00000008f7030 EFLAGS: 00010286
[    9.008759][  T177] RAX: 00000000ffffffa6 RBX: ff1100000b0fdc40 RCX: 1ff400000011edcc
[    9.008968][  T177] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff1100000b0fdcf8
[    9.009165][  T177] RBP: ff110000028c1000 R08: 1fe220000161fba0 R09: ff1100000a5cd158
[    9.009361][  T177] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[    9.009562][  T177] R13: 0000000000000000 R14: 0000000000000000 R15: ff110000028c1cd1
[    9.009759][  T177] FS:  00007f4282085840(0000) GS:ff110000996c3000(0000) knlGS:0000000000000000
[    9.010002][  T177] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.010168][  T177] CR2: 00000000403ef988 CR3: 000000000c0a8006 CR4: 0000000000771ef0
[    9.010368][  T177] PKRU: 55555554
[    9.010467][  T177] Call Trace:
[    9.010566][  T177]  <TASK>
[    9.010635][  T177]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[    9.010769][  T177]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[    9.010870][  T177]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[    9.011010][  T177]  __dev_notify_flags (net/core/dev.c:9787)
[    9.011143][  T177]  ? netif_change_name (net/core/dev.c:1495)
[    9.011275][  T177]  ? __dev_change_flags (net/core/dev.c:9752)
[    9.011408][  T177]  ? netif_set_allmulti (./include/net/netdev_lock.h:30 (discriminator 1))
[    9.011541][  T177]  ? is_bpf_text_address (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) kernel/bpf/core.c:749 (discriminator 2))
[    9.011675][  T177]  netif_change_flags (net/core/dev.c:9820)
[    9.011811][  T177]  do_setlink.isra.0 (net/core/rtnetlink.c:3206 (discriminator 1))
[    9.011951][  T177]  ? rtnl_link_get_size (net/core/rtnetlink.c:716)
[    9.012085][  T177]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 3) kernel/rcu/tree.c:4032 (discriminator 3))
[    9.012251][  T177]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[    9.012384][  T177]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[    9.012517][  T177]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:388 kernel/rcu/update.c:380)
[    9.012649][  T177]  ? stack_depot_save_flags (lib/stackdepot.c:609 (discriminator 2) lib/stackdepot.c:676 (discriminator 2))
[    9.012784][  T177]  ? __kernel_text_address (kernel/extable.c:79)
[    9.013005][  T177]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.013139][  T177]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.013273][  T177]  ? rtnl_newlink (net/core/rtnetlink.c:80 net/core/rtnetlink.c:341 net/core/rtnetlink.c:4149)
[    9.013405][  T177]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.013538][  T177]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[    9.013669][  T177]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.013801][  T177]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.013941][  T177]  ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 22))
[    9.014074][  T177]  ? __mutex_lock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.c:89 kernel/locking/mutex.c:134 kernel/locking/mutex.c:649 kernel/locking/mutex.c:820)
[    9.014207][  T177]  ? __mutex_lock (kernel/locking/mutex.c:798 (discriminator 1) kernel/locking/mutex.c:820 (discriminator 1))
[    9.014339][  T177]  ? rtnl_newlink (net/core/rtnetlink.c:80 net/core/rtnetlink.c:341 net/core/rtnetlink.c:4149)
[    9.014472][  T177]  ? ww_mutex_lock (kernel/locking/mutex.c:933)
[    9.014607][  T177]  ? __rtnl_newlink (net/core/rtnetlink.c:4000)
[    9.014742][  T177]  rtnl_newlink (net/core/rtnetlink.c:4150)
[    9.014876][  T177]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.015014][  T177]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[    9.015147][  T177]  ? __rtnl_newlink (net/core/rtnetlink.c:4027 (discriminator 1))
[    9.015278][  T177]  ? mark_usage (kernel/locking/lockdep.c:4674)
[    9.015411][  T177]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    9.015546][  T177]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.015677][  T177]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[    9.015808][  T177]  ? __rtnl_newlink (net/core/rtnetlink.c:4027 (discriminator 1))
[    9.015947][  T177]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[    9.016081][  T177]  ? __rtnl_newlink (net/core/rtnetlink.c:4027 (discriminator 1))
[    9.016213][  T177]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7061)
[    9.016347][  T177]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[    9.016478][  T177]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[    9.016610][  T177]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.016747][  T177]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[    9.016879][  T177]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[    9.017021][  T177]  netlink_rcv_skb (net/netlink/af_netlink.c:2551)
[    9.017154][  T177]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[    9.017287][  T177]  ? netlink_ack (./include/linux/skbuff.h:2718)
[    9.017425][  T177]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/net/netns/generic.h:48 (discriminator 2) net/netlink/af_netlink.c:334 (discriminator 2))
[    9.017556][  T177]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) net/netlink/af_netlink.c:341 (discriminator 2))
[    9.017690][  T177]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[    9.017825][  T177]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[    9.017968][  T177]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[    9.018103][  T177]  netlink_sendmsg (net/netlink/af_netlink.c:1895)
[    9.018237][  T177]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[    9.018372][  T177]  ? __might_fault (mm/memory.c:7340 (discriminator 5))
[    9.018507][  T177]  ____sys_sendmsg (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2698 (discriminator 4))
[    9.018640][  T177]  ? copy_msghdr_from_user (net/socket.c:2635)
[    9.018771][  T177]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5349)
[    9.018943][  T177]  ? move_addr_to_kernel (net/socket.c:258)
[    9.019077][  T177]  ? stack_depot_save_flags (lib/stackdepot.c:609 (discriminator 2) lib/stackdepot.c:676 (discriminator 2))
[    9.019209][  T177]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[    9.019344][  T177]  ___sys_sendmsg (net/socket.c:2752)
[    9.019475][  T177]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3131)
[    9.019638][  T177]  ? copy_msghdr_from_user (net/socket.c:2603)
[    9.019782][  T177]  __sys_sendmsg (net/socket.c:2784)
[    9.019923][  T177]  ? __sys_sendmsg_sock (net/socket.c:2765)
[    9.020055][  T177]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3156 (discriminator 6))
[    9.020223][  T177]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[    9.020357][  T177]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[    9.020490][  T177]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    9.020624][  T177]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[    9.020759][  T177]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[    9.020894][  T177]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[    9.021121][  T177] RIP: 0033:0x7f42822bf08e
[    9.021262][  T177] 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
[    9.021783][  T177] RSP: 002b:00007fffc2aa52c0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[    9.021994][  T177] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f42822bf08e
[    9.022195][  T177] RDX: 0000000000000000 RSI: 00007fffc2aa5370 RDI: 0000000000000005
[    9.022396][  T177] RBP: 00007fffc2aa52d0 R08: 0000000000000000 R09: 0000000000000000
[    9.022597][  T177] R10: 0000000000000000 R11: 0000000000000202 R12: 000000006a10e7aa
[    9.022797][  T177] R13: 000000000049f620 R14: 0000000000000000 R15: 00007fffc2aa5a40
| [   20.534836][   T12] ------------[ cut here ]------------
| [   20.535064][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 0/12
| [   20.535318][   T12] Modules linked in:
| [   20.535751][   T12] Tainted: [W]=WARN
[   20.535847][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.536061][   T12] Workqueue: netns cleanup_net
[   20.536201][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   20.536367][   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 38 e5 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 38 e5 f0 ff       	call   0xfffffffffff0e574
  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 38 e5 f0 ff       	call   0xfffffffffff0e54a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   20.536860][   T12] RSP: 0018:ffa00000000c7748 EFLAGS: 00010286
[   20.537040][   T12] RAX: 00000000ffffffa6 RBX: ff11000009d46580 RCX: 1ff4000000018eaf
[   20.537226][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000009d46638
[   20.537414][   T12] RBP: ff110000028c1000 R08: 1fe22000013a8cc8 R09: ff11000001b051d0
[   20.537603][   T12] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000041
[   20.537788][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: ffa00000000c77e0
[   20.537991][   T12] FS:  0000000000000000(0000) GS:ff110000996c3000(0000) knlGS:0000000000000000
[   20.538213][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.538371][   T12] CR2: 00007fdf506c5888 CR3: 000000000ca8c002 CR4: 0000000000771ef0
[   20.538564][   T12] PKRU: 55555554
[   20.538656][   T12] Call Trace:
[   20.538805][   T12]  <TASK>
[   20.538873][   T12]  rtmsg_ifinfo_event.part.0 (net/core/rtnetlink.c:4551)
[   20.539010][   T12]  rtmsg_ifinfo (net/core/rtnetlink.c:4551 net/core/rtnetlink.c:4560)
[   20.539105][   T12]  netif_close_many (net/core/dev.c:1804)
[   20.539228][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   20.539355][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   20.539480][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   20.539601][   T12]  ? __dev_close_many (net/core/dev.c:1781)
[   20.539724][   T12]  ? netif_close_many_and_unlock (net/core/dev.c:12330)
[   20.539876][   T12]  ? __rtnl_unlock (net/core/rtnetlink.c:143)
[   20.540011][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12406)
[   20.540167][   T12]  ? mutex_is_locked (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.h:48 kernel/locking/mutex.c:65)
[   20.540290][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   20.540413][   T12]  ? default_device_exit_net (net/core/dev.c:13033 (discriminator 1))
[   20.540541][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   20.540702][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   20.540844][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   20.541006][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   20.541132][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   20.541256][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   20.541388][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   20.541511][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   20.541637][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   20.541764][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   20.541921][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   20.542060][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   20.542209][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   20.542333][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   20.542458][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   20.542583][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   20.542716][   T12]  process_one_work (kernel/workqueue.c:3314)
[   20.542845][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   20.542979][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   20.543108][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   20.543239][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   20.543362][   T12]  kthread (kernel/kthread.c:436)
[   20.543455][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   20.543608][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   20.543731][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   20.543857][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   20.544021][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   20.544145][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   20.544269][   T12]  ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
| [   20.555810][   T12] ------------[ cut here ]------------
| [   20.555974][   T12] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0x1a6/0x250, CPU#3: 0/12
| [   20.556209][   T12] Modules linked in:
| [   20.556573][   T12] Tainted: [W]=WARN
[   20.556662][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.556812][   T12] Workqueue: netns cleanup_net
[   20.556946][   T12] RIP: 0010:rtmsg_ifinfo_build_skb (net/core/rtnetlink.c:4523 (discriminator 3))
[   20.557128][   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 38 e5 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 38 e5 f0 ff       	call   0xfffffffffff0e574
  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 38 e5 f0 ff       	call   0xfffffffffff0e54a
  12:	b9                   	.byte 0xb9
  13:	a6                   	cmpsb  (%rdi),(%rsi)
  14:	ff                   	(bad)
  15:	ff                   	.byte 0xff
[   20.557556][   T12] RSP: 0018:ffa00000000c7878 EFLAGS: 00010286
[   20.557705][   T12] RAX: 00000000ffffffa6 RBX: ff11000005178e40 RCX: 1ff4000000018ed5
[   20.557904][   T12] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff11000005178ef8
[   20.558086][   T12] RBP: ff110000028c1000 R08: 1fe2200000a2f1e0 R09: ff11000001b051d0
[   20.558293][   T12] R10: 0000000000000003 R11: 0000000000000001 R12: 00000000ffffffff
[   20.558468][   T12] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
[   20.558645][   T12] FS:  0000000000000000(0000) GS:ff110000996c3000(0000) knlGS:0000000000000000
[   20.558852][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.559079][   T12] CR2: 00007fdf506c5888 CR3: 000000000ca8c002 CR4: 0000000000771ef0
[   20.559255][   T12] PKRU: 55555554
[   20.559367][   T12] Call Trace:
[   20.559457][   T12]  <TASK>
[   20.559527][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12439)
[   20.559679][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   20.559830][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   20.559960][   T12]  default_device_exit_batch (net/core/dev.c:12497 net/core/dev.c:13089)
[   20.560079][   T12]  ? generic_xdp_install (./include/linux/netdevice.h:5659)
[   20.560196][   T12]  ? ipmr_free_table (net/ipv4/ipmr.c:453)
[   20.560340][   T12]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   20.560458][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   20.560575][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   20.560695][   T12]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   20.560821][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   20.560944][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   20.561065][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   20.561187][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   20.561303][   T12]  ? process_one_work (kernel/workqueue.c:3290 (discriminator 2))
[   20.561427][   T12]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   20.561544][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   20.561664][   T12]  process_one_work (kernel/workqueue.c:3314)
[   20.561785][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   20.561933][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   20.562060][   T12]  worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)
[   20.562182][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   20.562298][   T12]  kthread (kernel/kthread.c:436)
[   20.562387][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   20.562532][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   20.562651][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   20.562775][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   20.562939][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   20.563058][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
rtmsg_ifinfo_build_skb:unregister_netdevice_many_notify:default_device_exit_batch:ops_undo_list:cleanup_net
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:register_netdevice:register_netdev:loopback_net_init
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:netif_close_many:unregister_netdevice_many_notify:default_device_exit_batch
rtmsg_ifinfo_build_skb:rtmsg_ifinfo:__dev_notify_flags:netif_change_flags:rtnl_newlink