[  138.987055] ------------[ cut here ]------------
[  138.987111] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: unshare/292
[  138.987172] Modules linked in:
[  138.987205] CPU: 0 UID: 0 PID: 292 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.987268] Tainted: [W]=WARN
[  138.987293] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.987331] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.987364] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  138.987460] RSP: 0018:ff4793520027bcc8 EFLAGS: 00010286
[  138.987497] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.987544] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa100
[  138.987595] RBP: 0000000000000000 R08: ff201fa743036890 R09: ff201fa7430c602c
[  138.987641] R10: ff201fa742ea5118 R11: fefefefefefefeff R12: 0000000000000000
[  138.987684] R13: 0000000000000010 R14: ff201fa742ea5000 R15: ff201fa742faa100
[  138.987733] FS:  00007f4eb07a7740(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  138.987787] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.987827] CR2: 00005610e0ab9008 CR3: 00000000045a0003 CR4: 0000000000771ef0
[  138.987866] PKRU: 55555554
[  138.987883] Call Trace:
[  138.987902]  <TASK>
[  138.987919]  rtmsg_ifinfo+0x3c/0xa0
[  138.987945]  register_netdevice+0x889/0x9f0
[  138.987968]  register_netdev+0x1e/0x30
[  138.987993]  loopback_net_init+0x57/0xb0
[  138.988019]  ? vsock_sysctl_init_net+0xb6/0x140
[  138.988051]  ops_init+0x68/0x140
[  138.988076]  setup_net+0x85/0x150
[  138.988099]  copy_net_ns+0xf5/0x200
[  138.988121]  create_new_namespaces+0x117/0x2f0
[  138.988157]  unshare_nsproxy_namespaces+0x85/0xb0
[  138.988187]  ksys_unshare+0x346/0x5e0
[  138.988212]  __x64_sys_unshare+0x12/0x20
[  138.988237]  do_syscall_64+0x104/0xfc0
[  138.988264]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.988290] RIP: 0033:0x7f4eb08a2bcb
[  138.988317] 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
[  138.988425] RSP: 002b:00007ffc1511b1b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  138.988469] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4eb08a2bcb
[  138.988521] RDX: 0000000000000000 RSI: 00007ffc1511af20 RDI: 0000000040000000
[  138.988567] RBP: 00007ffc1511b540 R08: 00007ffc1511b110 R09: 0000000000000000
[  138.988617] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  138.988661] R13: 0000000000000000 R14: 00000000ffffffff R15: 00005610cb8d2b68
[  138.988707]  </TASK>
[  138.988722] ---[ end trace 0000000000000000 ]---
[  138.989445] ------------[ cut here ]------------
[  138.989480] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/292
[  138.989543] Modules linked in:
[  138.989569] CPU: 0 UID: 0 PID: 292 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.989624] Tainted: [W]=WARN
[  138.989646] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.989681] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.989717] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  138.989821] RSP: 0018:ff4793520027bd68 EFLAGS: 00010286
[  138.989850] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.989894] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa100
[  138.989945] RBP: 0000000000000000 R08: ff201fa743279510 R09: ff201fa744775030
[  138.989987] R10: ff201fa7433a8118 R11: fefefefefefefeff R12: 0000000000000000
[  138.990036] R13: 0000000000000010 R14: ff201fa7433a8000 R15: ff201fa742faa100
[  138.990086] FS:  000000001d12b400(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  138.990136] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.990173] CR2: 00007ff46cfc6000 CR3: 000000000452c004 CR4: 0000000000771ef0
[  138.990219] PKRU: 55555554
[  138.990236] Call Trace:
[  138.990253]  <TASK>
[  138.990273]  rtmsg_ifinfo+0x3c/0xa0
[  138.990296]  register_netdevice+0x889/0x9f0
[  138.990318]  __tun_chr_ioctl+0x83c/0x16c0
[  138.990342]  ? do_sys_openat2+0x9a/0xe0
[  138.990374]  __x64_sys_ioctl+0xa1/0xe0
[  138.990398]  do_syscall_64+0x104/0xfc0
[  138.990426]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.990461] RIP: 0033:0x47cc8d
[  138.990484] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  138.990628] RSP: 002b:00007ffc042f0480 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.990676] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.990727] RDX: 00007ffc042f0500 RSI: 00000000400454ca RDI: 0000000000000005
[  138.990769] RBP: 00007ffc042f04d0 R08: 0000000000000000 R09: 0000000000000000
[  138.990812] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc042f09d8
[  138.990858] R13: 00007ffc042f0a58 R14: 0000000000000002 R15: 0000000000543540
[  138.990907]  </TASK>
[  138.990921] ---[ end trace 0000000000000000 ]---
[  138.990966] ------------[ cut here ]------------
[  138.990995] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/292
[  138.991046] Modules linked in:
[  138.991070] CPU: 0 UID: 0 PID: 292 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.991125] Tainted: [W]=WARN
[  138.991150] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.991188] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.991219] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  138.991328] RSP: 0018:ff4793520027bd60 EFLAGS: 00010286
[  138.991359] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  138.991403] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa100
[  138.991446] RBP: 0000000000000002 R08: ff201fa743279510 R09: ff201fa744775030
[  138.991488] R10: ff201fa7433a8118 R11: fefefefefefefeff R12: 0000000000000000
[  138.991536] R13: 0000000000000010 R14: ff201fa7433a8000 R15: ff201fa742faa100
[  138.991591] FS:  000000001d12b400(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  138.991633] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.991668] CR2: 00007ff46cfc6000 CR3: 000000000452c004 CR4: 0000000000771ef0
[  138.991710] PKRU: 55555554
[  138.991724] Call Trace:
[  138.991740]  <TASK>
[  138.991756]  rtnetlink_event+0x6e/0xb0
[  138.991782]  notifier_call_chain+0x6d/0x100
[  138.991805]  netdev_update_features+0x56/0x60
[  138.991837]  __tun_chr_ioctl+0xbf1/0x16c0
[  138.991863]  ? file_init_path+0x62/0x120
[  138.991885]  __x64_sys_ioctl+0xa1/0xe0
[  138.991910]  do_syscall_64+0x104/0xfc0
[  138.991934]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.991965] RIP: 0033:0x47cc8d
[  138.991989] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  138.992102] RSP: 002b:00007ffc042f04c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.992152] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.992200] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  138.992244] RBP: 00007ffc042f0510 R08: 0000000000000000 R09: 0000000000000000
[  138.992286] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc042f09d8
[  138.992333] R13: 00007ffc042f0a58 R14: 0000000000000002 R15: 0000000000543540
[  138.992383]  </TASK>
[  138.992398] ---[ end trace 0000000000000000 ]---
[  138.992444] ------------[ cut here ]------------
[  138.992476] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/292
[  138.992534] Modules linked in:
[  138.992557] CPU: 0 UID: 0 PID: 292 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.992620] Tainted: [W]=WARN
[  138.992641] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.992673] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.992703] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  138.992802] RSP: 0018:ff4793520027bc10 EFLAGS: 00010286
[  138.992832] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  138.992876] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa100
[  138.992920] RBP: 0000000000000000 R08: ff201fa743279510 R09: ff201fa744771030
[  138.992965] R10: ff201fa7433a8118 R11: fefefefefefefeff R12: 0000000000000000
[  138.993008] R13: 0000000000000010 R14: ff201fa7433a8000 R15: ff201fa742faa100
[  138.993054] FS:  000000001d12b400(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  138.993099] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.993132] CR2: 00007ff46cfc6000 CR3: 000000000452c004 CR4: 0000000000771ef0
[  138.993177] PKRU: 55555554
[  138.993192] Call Trace:
[  138.993207]  <TASK>
[  138.993222]  rtmsg_ifinfo+0x3c/0xa0
[  138.993247]  __dev_notify_flags+0xb1/0xf0
[  138.993272]  netif_change_flags+0x54/0x70
[  138.993292]  dev_change_flags+0x45/0x80
[  138.993313]  devinet_ioctl+0x607/0x7f0
[  138.993338]  inet_ioctl+0x229/0x240
[  138.993363]  ? __rtnl_unlock+0x35/0x60
[  138.993385]  sock_do_ioctl+0x75/0x140
[  138.993407]  __x64_sys_ioctl+0xa1/0xe0
[  138.993429]  do_syscall_64+0x104/0xfc0
[  138.993451]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.993483] RIP: 0033:0x47cc8d
[  138.993506] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[  138.993602] RSP: 002b:00007ffc042f04a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.993648] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.993690] RDX: 00007ffc042f0510 RSI: 0000000000008914 RDI: 0000000000000006
[  138.993738] RBP: 00007ffc042f04f0 R08: 0000000000000000 R09: 0000000000000000
[  138.993783] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc042f09d8
[  138.993827] R13: 00007ffc042f0a58 R14: 0000000000000002 R15: 0000000000543540
[  138.993870]  </TASK>
[  138.993884] ---[ end trace 0000000000000000 ]---
[  183.970194] ------------[ cut here ]------------
[  183.972881] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/292
[  183.972957] Modules linked in:
[  183.972992] CPU: 0 UID: 0 PID: 292 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.973088] Tainted: [W]=WARN
[  183.973132] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.973186] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.973232] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  183.973368] RSP: 0018:ff4793520027bb58 EFLAGS: 00010286
[  183.973426] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  183.974049] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa74313d700
[  183.974096] RBP: 0000000000000000 R08: ff201fa743279510 R09: ff201fa744771030
[  183.974178] R10: ff201fa7433a8118 R11: fefefefefefefeff R12: 0000000000000000
[  183.974255] R13: 0000000000000010 R14: ff201fa7433a8000 R15: ff201fa74313d700
[  183.974323] FS:  0000000000000000(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  183.974391] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.974457] CR2: 00007fe675eec6f0 CR3: 000000001b042001 CR4: 0000000000771ef0
[  183.974512] PKRU: 55555554
[  183.974529] Call Trace:
[  183.974546]  <TASK>
[  183.974578]  rtmsg_ifinfo+0x3c/0xa0
[  183.974605]  netif_close_many+0xed/0x190
[  183.974641]  unregister_netdevice_many_notify+0x267/0x9d0
[  183.974699]  ? __queue_work+0x141/0x550
[  183.974729]  unregister_netdevice_queue+0x9e/0xd0
[  183.974786]  __tun_detach+0x591/0x5b0
[  183.974815]  tun_chr_close+0x3f/0xc0
[  183.974848]  __fput+0xe8/0x2c0
[  183.974892]  task_work_run+0x63/0xa0
[  183.974918]  do_exit+0x2c1/0xba0
[  183.974941]  ? ___sys_recvmsg+0xc6/0x100
[  183.974972]  do_group_exit+0x2d/0xc0
[  183.975009]  get_signal+0x82e/0x900
[  183.975042]  arch_do_signal_or_restart+0x77/0x2b0
[  183.975083]  exit_to_user_mode_loop+0x75/0x4a0
[  183.975129]  do_syscall_64+0x439/0xfc0
[  183.975164]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  183.975218] RIP: 0033:0x4c2d9e
[  183.975242] Code: Unable to access opcode bytes at 0x4c2d74.
[  183.975287] RSP: 002b:00007ffc042efe30 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[  183.975338] RAX: 0000000000000050 RBX: 00007ffc042efec0 RCX: 00000000004c2d9e
[  183.975396] RDX: 0000000000000000 RSI: 00007ffc042efed0 RDI: 0000000000000007
[  183.975454] RBP: 00007ffc042efe40 R08: 0000000000000000 R09: 0000000000000000
[  183.975502] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc042efeb4
[  183.975549] R13: 00007ffc042f0a58 R14: 00007ffc042f0000 R15: 0000000000543540
[  183.975615]  </TASK>
[  183.975640] ---[ end trace 0000000000000000 ]---
[  183.975935] ------------[ cut here ]------------
[  183.975967] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/292
[  183.976048] Modules linked in:
[  183.976075] CPU: 0 UID: 0 PID: 292 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.977548] Tainted: [W]=WARN
[  183.977578] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.977647] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.977701] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  183.977868] RSP: 0018:ff4793520027bbc8 EFLAGS: 00010286
[  183.977900] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  183.977963] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa74313d700
[  183.978019] RBP: 0000000000000000 R08: ff201fa743279510 R09: ff201fa7444df830
[  183.978096] R10: ff201fa7433a8118 R11: fefefefefefefeff R12: 0000000000000000
[  183.978156] R13: 0000000000000011 R14: ff201fa7433a8000 R15: ff201fa74313d700
[  183.978224] FS:  0000000000000000(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  183.978283] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.978343] CR2: 00007fe918dd5f98 CR3: 000000001b042001 CR4: 0000000000771ef0
[  183.978382] PKRU: 55555554
[  183.978402] Call Trace:
[  183.978422]  <TASK>
[  183.978445]  unregister_netdevice_many_notify+0x877/0x9d0
[  183.978486]  unregister_netdevice_queue+0x9e/0xd0
[  183.979864]  __tun_detach+0x591/0x5b0
[  183.979895]  tun_chr_close+0x3f/0xc0
[  183.979936]  __fput+0xe8/0x2c0
[  183.979962]  task_work_run+0x63/0xa0
[  183.979993]  do_exit+0x2c1/0xba0
[  183.980029]  ? ___sys_recvmsg+0xc6/0x100
[  183.980065]  do_group_exit+0x2d/0xc0
[  183.980093]  get_signal+0x82e/0x900
[  183.980125]  arch_do_signal_or_restart+0x77/0x2b0
[  183.980174]  exit_to_user_mode_loop+0x75/0x4a0
[  183.980237]  do_syscall_64+0x439/0xfc0
[  183.980263]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  183.980315] RIP: 0033:0x4c2d9e
[  183.980345] Code: Unable to access opcode bytes at 0x4c2d74.
[  183.980409] RSP: 002b:00007ffc042efe30 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[  183.980464] RAX: 0000000000000050 RBX: 00007ffc042efec0 RCX: 00000000004c2d9e
[  183.980546] RDX: 0000000000000000 RSI: 00007ffc042efed0 RDI: 0000000000000007
[  183.980613] RBP: 00007ffc042efe40 R08: 0000000000000000 R09: 0000000000000000
[  183.980652] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc042efeb4
[  183.980732] R13: 00007ffc042f0a58 R14: 00007ffc042f0000 R15: 0000000000543540
[  183.980774]  </TASK>
[  183.980812] ---[ end trace 0000000000000000 ]---
[  183.996606] ------------[ cut here ]------------
[  183.996689] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:0/12
[  183.996828] Modules linked in:
[  183.996894] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.997018] Tainted: [W]=WARN
[  183.997093] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.997186] Workqueue: netns cleanup_net
[  183.997271] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.997354] Code: 80 00 00 00 e8 59 d9 ff ff 48 83 c4 38 85 c0 75 18 48 83 c4 08 4c 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 44 8b 48 08 eb b4 90 <0f> 0b 90 ba 02 00 00 00 4c 89 fe 31 ff e8 76 b2 fb ff b9 a6 ff ff
[  183.997563] RSP: 0018:ff47935200067c78 EFLAGS: 00010286
[  183.997640] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  183.997743] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa300
[  183.997835] RBP: 0000000000000000 R08: ff201fa743036890 R09: ff201fa74606282c
[  183.997935] R10: ff201fa742ea5118 R11: fefefefefefefeff R12: 0000000000000000
[  183.998038] R13: 0000000000000011 R14: ff201fa742ea5000 R15: ff201fa742faa300
[  183.998158] FS:  0000000000000000(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[  183.998266] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.998370] CR2: 00007fe918db7680 CR3: 000000001b042005 CR4: 0000000000771ef0
[  183.998476] PKRU: 55555554
[  183.998538] Call Trace:
[  183.998592]  <TASK>
[  183.998652]  unregister_netdevice_many_notify+0x877/0x9d0
[  183.998731]  default_device_exit_batch+0x318/0x390
[  183.998812]  ops_undo_list+0x10b/0x240
[  183.998894]  cleanup_net+0x1d7/0x2e0
[  183.998969]  process_one_work+0x162/0x360
[  183.999035]  worker_thread+0x16e/0x2d0
[  183.999118]  ? rescuer_thread+0x510/0x510
[  183.999179]  kthread+0xe1/0x120
[  183.999261]  ? kthread_park+0xa0/0xa0
[  183.999321]  ret_from_fork+0x16d/0x250
[  183.999396]  ? kthread_park+0xa0/0xa0
[  183.999465]  ret_from_fork_asm+0x11/0x20
[  183.999543]  </TASK>
[  183.999596] ---[ end trace 0000000000000000 ]---