[    2.258751] ------------[ cut here ]------------
[    2.258838] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: unshare/159
[    2.258932] Modules linked in:
[    2.259014] CPU: 2 UID: 0 PID: 159 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.259112] Tainted: [W]=WARN
[    2.259169] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.259277] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.259351] 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
[    2.259557] RSP: 0018:ff6b6e7c803efcc8 EFLAGS: 00010286
[    2.259652] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.259731] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd7a00
[    2.259808] RBP: 0000000000000000 R08: ff48d0ec832ab550 R09: ff48d0ec8447902c
[    2.259885] R10: ff48d0ec81d54118 R11: fefefefefefefeff R12: 0000000000000000
[    2.259960] R13: 0000000000000010 R14: ff48d0ec81d54000 R15: ff48d0ec81cd7a00
[    2.260051] FS:  00007f5173236740(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[    2.260130] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.260199] CR2: 000055858c2c9310 CR3: 00000000045a9006 CR4: 0000000000771ef0
[    2.260277] PKRU: 55555554
[    2.260325] Call Trace:
[    2.260375]  <TASK>
[    2.260425]  rtmsg_ifinfo+0x3c/0xa0
[    2.260487]  register_netdevice+0x889/0x9f0
[    2.260545]  register_netdev+0x1e/0x30
[    2.260602]  loopback_net_init+0x57/0xb0
[    2.260663]  ? vsock_sysctl_init_net+0xb6/0x140
[    2.260728]  ops_init+0x68/0x140
[    2.260787]  setup_net+0x85/0x150
[    2.260845]  copy_net_ns+0xf5/0x200
[    2.260902]  create_new_namespaces+0x117/0x2f0
[    2.260976]  unshare_nsproxy_namespaces+0x85/0xb0
[    2.261043]  ksys_unshare+0x346/0x5e0
[    2.261104]  __x64_sys_unshare+0x12/0x20
[    2.261161]  do_syscall_64+0x104/0xfc0
[    2.261220]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.261285] RIP: 0033:0x7f5173331bcb
[    2.261343] 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
[    2.261473] RSP: 002b:00007ffe89458a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    2.261551] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5173331bcb
[    2.261628] RDX: 0000000000000000 RSI: 00007ffe894587a0 RDI: 0000000040000000
[    2.261705] RBP: 00007ffe89458dc0 R08: 00007ffe89458990 R09: 0000000000000000
[    2.261782] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    2.261858] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055858c2ccb68
[    2.261956]  </TASK>
[    2.262020] ---[ end trace 0000000000000000 ]---
[    2.265370] ------------[ cut here ]------------
[    2.265437] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/159
[    2.265530] Modules linked in:
[    2.265592] CPU: 2 UID: 0 PID: 159 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.265681] Tainted: [W]=WARN
[    2.265741] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.265817] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.265887] 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
[    2.266035] RSP: 0018:ff6b6e7c803efd68 EFLAGS: 00010286
[    2.266102] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.266182] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd7a00
[    2.266262] RBP: 0000000000000000 R08: ff48d0ec82ae68d0 R09: ff48d0ec8447e030
[    2.266341] R10: ff48d0ec84614118 R11: fefefefefefefeff R12: 0000000000000000
[    2.266420] R13: 0000000000000010 R14: ff48d0ec84614000 R15: ff48d0ec81cd7a00
[    2.266503] FS:  000000000ffe7400(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[    2.266585] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.266657] CR2: 00007fd94cb5b000 CR3: 00000000032f5002 CR4: 0000000000771ef0
[    2.266740] PKRU: 55555554
[    2.266790] Call Trace:
[    2.266841]  <TASK>
[    2.266892]  rtmsg_ifinfo+0x3c/0xa0
[    2.266954]  register_netdevice+0x889/0x9f0
[    2.267027]  __tun_chr_ioctl+0x83c/0x16c0
[    2.267092]  ? do_sys_openat2+0x9a/0xe0
[    2.267156]  __x64_sys_ioctl+0xa1/0xe0
[    2.267216]  do_syscall_64+0x104/0xfc0
[    2.267280]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.267349] RIP: 0033:0x47cc8d
[    2.267409] 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
[    2.267538] RSP: 002b:00007ffd81f235a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.267618] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.267697] RDX: 00007ffd81f23620 RSI: 00000000400454ca RDI: 0000000000000005
[    2.267777] RBP: 00007ffd81f235f0 R08: 0000000000000000 R09: 0000000000000000
[    2.267856] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd81f23af8
[    2.267936] R13: 00007ffd81f23b78 R14: 0000000000000002 R15: 0000000000543540
[    2.268029]  </TASK>
[    2.268080] ---[ end trace 0000000000000000 ]---
[    2.268166] ------------[ cut here ]------------
[    2.268234] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/159
[    2.268321] Modules linked in:
[    2.268383] CPU: 2 UID: 0 PID: 159 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.268473] Tainted: [W]=WARN
[    2.268533] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.268605] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.268673] 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
[    2.268799] RSP: 0018:ff6b6e7c803efd60 EFLAGS: 00010286
[    2.268867] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[    2.268946] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd7a00
[    2.269036] RBP: 0000000000000002 R08: ff48d0ec82ae68d0 R09: ff48d0ec8447e030
[    2.269116] R10: ff48d0ec84614118 R11: fefefefefefefeff R12: 0000000000000000
[    2.269196] R13: 0000000000000010 R14: ff48d0ec84614000 R15: ff48d0ec81cd7a00
[    2.269279] FS:  000000000ffe7400(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[    2.269359] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.269432] CR2: 00007fd94cb5b000 CR3: 00000000032f5002 CR4: 0000000000771ef0
[    2.269512] PKRU: 55555554
[    2.269563] Call Trace:
[    2.269613]  <TASK>
[    2.269663]  rtnetlink_event+0x6e/0xb0
[    2.269726]  notifier_call_chain+0x6d/0x100
[    2.269788]  netdev_update_features+0x56/0x60
[    2.269857]  __tun_chr_ioctl+0xbf1/0x16c0
[    2.269920]  ? file_init_path+0x62/0x120
[    2.269996]  __x64_sys_ioctl+0xa1/0xe0
[    2.270058]  do_syscall_64+0x104/0xfc0
[    2.270121]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.270188] RIP: 0033:0x47cc8d
[    2.270246] 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
[    2.270372] RSP: 002b:00007ffd81f235e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.270452] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.270532] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    2.270612] RBP: 00007ffd81f23630 R08: 0000000000000005 R09: 0000000000001ff0
[    2.270693] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd81f23af8
[    2.270772] R13: 00007ffd81f23b78 R14: 0000000000000002 R15: 0000000000543540
[    2.270851]  </TASK>
[    2.270901] ---[ end trace 0000000000000000 ]---
[    2.271028] ------------[ cut here ]------------
[    2.271089] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/159
[    2.271180] Modules linked in:
[    2.271241] CPU: 2 UID: 0 PID: 159 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.271334] Tainted: [W]=WARN
[    2.271390] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.271465] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.271533] 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
[    2.271659] RSP: 0018:ff6b6e7c803efc10 EFLAGS: 00010286
[    2.271727] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[    2.271805] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd7a00
[    2.271884] RBP: 0000000000000000 R08: ff48d0ec82ae68d0 R09: ff48d0ec8448b030
[    2.271971] R10: ff48d0ec84614118 R11: fefefefefefefeff R12: 0000000000000000
[    2.272057] R13: 0000000000000010 R14: ff48d0ec84614000 R15: ff48d0ec81cd7a00
[    2.272140] FS:  000000000ffe7400(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[    2.272221] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.272295] CR2: 00007fd94cb5b000 CR3: 00000000032f5002 CR4: 0000000000771ef0
[    2.272375] PKRU: 55555554
[    2.272424] Call Trace:
[    2.272475]  <TASK>
[    2.272525]  rtmsg_ifinfo+0x3c/0xa0
[    2.272589]  __dev_notify_flags+0xb1/0xf0
[    2.272652]  netif_change_flags+0x54/0x70
[    2.272714]  dev_change_flags+0x45/0x80
[    2.272775]  devinet_ioctl+0x607/0x7f0
[    2.272839]  inet_ioctl+0x229/0x240
[    2.272901]  ? __rtnl_unlock+0x35/0x60
[    2.272970]  sock_do_ioctl+0x75/0x140
[    2.273041]  __x64_sys_ioctl+0xa1/0xe0
[    2.273103]  do_syscall_64+0x104/0xfc0
[    2.273165]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.273237] RIP: 0033:0x47cc8d
[    2.273297] 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
[    2.273423] RSP: 002b:00007ffd81f235c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.273503] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.273582] RDX: 00007ffd81f23630 RSI: 0000000000008914 RDI: 0000000000000006
[    2.273662] RBP: 00007ffd81f23610 R08: 0000000000000005 R09: 0000000000001ff0
[    2.273741] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd81f23af8
[    2.273819] R13: 00007ffd81f23b78 R14: 0000000000000002 R15: 0000000000543540
[    2.273899]  </TASK>
[    2.273949] ---[ end trace 0000000000000000 ]---
[   47.239704] ------------[ cut here ]------------
[   47.239814] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/159
[   47.239911] Modules linked in:
[   47.240171] CPU: 2 UID: 0 PID: 159 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.240269] Tainted: [W]=WARN
[   47.240327] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.240398] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.240463] 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
[   47.240596] RSP: 0018:ff6b6e7c803efb58 EFLAGS: 00010286
[   47.240659] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[   47.240737] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd5600
[   47.240816] RBP: 0000000000000000 R08: ff48d0ec82ae68d0 R09: ff48d0ec8448b030
[   47.240893] R10: ff48d0ec84614118 R11: fefefefefefefeff R12: 0000000000000000
[   47.240978] R13: 0000000000000010 R14: ff48d0ec84614000 R15: ff48d0ec81cd5600
[   47.241061] FS:  0000000000000000(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[   47.241148] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.241219] CR2: 00007fd94cb5b000 CR3: 000000000f842003 CR4: 0000000000771ef0
[   47.241298] PKRU: 55555554
[   47.241347] Call Trace:
[   47.241398]  <TASK>
[   47.241448]  rtmsg_ifinfo+0x3c/0xa0
[   47.241506]  netif_close_many+0xed/0x190
[   47.241566]  unregister_netdevice_many_notify+0x267/0x9d0
[   47.241631]  ? __queue_work+0x141/0x550
[   47.241691]  unregister_netdevice_queue+0x9e/0xd0
[   47.241756]  __tun_detach+0x591/0x5b0
[   47.241819]  tun_chr_close+0x3f/0xc0
[   47.241877]  __fput+0xe8/0x2c0
[   47.241938]  task_work_run+0x63/0xa0
[   47.242005]  do_exit+0x2c1/0xba0
[   47.242064]  ? netlink_dump+0x336/0x450
[   47.242120]  do_group_exit+0x2d/0xc0
[   47.242182]  get_signal+0x82e/0x900
[   47.242242]  arch_do_signal_or_restart+0x77/0x2b0
[   47.242309]  exit_to_user_mode_loop+0x75/0x4a0
[   47.242376]  do_syscall_64+0x439/0xfc0
[   47.242436]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   47.242502] RIP: 0033:0x4c2d9e
[   47.242559] Code: Unable to access opcode bytes at 0x4c2d74.
[   47.242629] RSP: 002b:00007ffd81f22f50 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   47.242735] RAX: 0000000000000050 RBX: 00007ffd81f22fe0 RCX: 00000000004c2d9e
[   47.242812] RDX: 0000000000000000 RSI: 00007ffd81f22ff0 RDI: 0000000000000007
[   47.242890] RBP: 00007ffd81f22f60 R08: 0000000000000000 R09: 0000000000000000
[   47.242975] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd81f22fd4
[   47.243081] R13: 00007ffd81f23b78 R14: 00007ffd81f23120 R15: 0000000000543540
[   47.243204]  </TASK>
[   47.243332] ---[ end trace 0000000000000000 ]---
[   47.244641] ------------[ cut here ]------------
[   47.244707] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/159
[   47.244799] Modules linked in:
[   47.244856] CPU: 2 UID: 0 PID: 159 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.244952] Tainted: [W]=WARN
[   47.245161] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.245235] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.245301] 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
[   47.245435] RSP: 0018:ff6b6e7c803efbc8 EFLAGS: 00010286
[   47.245499] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   47.245576] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd5600
[   47.245652] RBP: 0000000000000000 R08: ff48d0ec82ae68d0 R09: ff48d0ec84483030
[   47.245730] R10: ff48d0ec84614118 R11: fefefefefefefeff R12: 0000000000000000
[   47.245810] R13: 0000000000000011 R14: ff48d0ec84614000 R15: ff48d0ec81cd5600
[   47.245889] FS:  0000000000000000(0000) GS:ff48d0ed07d96000(0000) knlGS:0000000000000000
[   47.245975] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.246045] CR2: 00007fd94cb5b000 CR3: 000000000f842003 CR4: 0000000000771ef0
[   47.246125] PKRU: 55555554
[   47.246180] Call Trace:
[   47.246230]  <TASK>
[   47.246279]  unregister_netdevice_many_notify+0x877/0x9d0
[   47.246345]  unregister_netdevice_queue+0x9e/0xd0
[   47.246410]  __tun_detach+0x591/0x5b0
[   47.246469]  tun_chr_close+0x3f/0xc0
[   47.246528]  __fput+0xe8/0x2c0
[   47.246587]  task_work_run+0x63/0xa0
[   47.246646]  do_exit+0x2c1/0xba0
[   47.246703]  ? netlink_dump+0x336/0x450
[   47.246762]  do_group_exit+0x2d/0xc0
[   47.246820]  get_signal+0x82e/0x900
[   47.246878]  arch_do_signal_or_restart+0x77/0x2b0
[   47.246944]  exit_to_user_mode_loop+0x75/0x4a0
[   47.247021]  do_syscall_64+0x439/0xfc0
[   47.247080]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   47.247152] RIP: 0033:0x4c2d9e
[   47.247209] Code: Unable to access opcode bytes at 0x4c2d74.
[   47.247278] RSP: 002b:00007ffd81f22f50 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
[   47.247356] RAX: 0000000000000050 RBX: 00007ffd81f22fe0 RCX: 00000000004c2d9e
[   47.247433] RDX: 0000000000000000 RSI: 00007ffd81f22ff0 RDI: 0000000000000007
[   47.247511] RBP: 00007ffd81f22f60 R08: 0000000000000000 R09: 0000000000000000
[   47.247589] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd81f22fd4
[   47.247666] R13: 00007ffd81f23b78 R14: 00007ffd81f23120 R15: 0000000000543540
[   47.247744]  </TASK>
[   47.247792] ---[ end trace 0000000000000000 ]---
[   47.259079] ------------[ cut here ]------------
[   47.259124] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: kworker/u16:1/64
[   47.259217] Modules linked in:
[   47.259243] CPU: 1 UID: 0 PID: 64 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.259299] Tainted: [W]=WARN
[   47.259322] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.259364] Workqueue: netns cleanup_net
[   47.259390] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.259418] 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
[   47.259510] RSP: 0018:ff6b6e7c80237c78 EFLAGS: 00010286
[   47.259541] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   47.259583] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48d0ec81cd5700
[   47.259623] RBP: 0000000000000000 R08: ff48d0ec832ab550 R09: ff48d0ec82fae02c
[   47.259667] R10: ff48d0ec81d54118 R11: fefefefefefefeff R12: 0000000000000000
[   47.259709] R13: 0000000000000011 R14: ff48d0ec81d54000 R15: ff48d0ec81cd5700
[   47.259754] FS:  0000000000000000(0000) GS:ff48d0ed07d16000(0000) knlGS:0000000000000000
[   47.259797] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.259832] CR2: 00007fd92005a680 CR3: 000000000f842001 CR4: 0000000000771ef0
[   47.259870] PKRU: 55555554
[   47.259886] Call Trace:
[   47.259900]  <TASK>
[   47.259916]  unregister_netdevice_many_notify+0x877/0x9d0
[   47.259948]  default_device_exit_batch+0x318/0x390
[   47.259981]  ops_undo_list+0x10b/0x240
[   47.260004]  cleanup_net+0x1d7/0x2e0
[   47.260028]  process_one_work+0x162/0x360
[   47.260054]  worker_thread+0x16e/0x2d0
[   47.260076]  ? rescuer_thread+0x510/0x510
[   47.260098]  kthread+0xe1/0x120
[   47.260120]  ? kthread_park+0xa0/0xa0
[   47.260147]  ret_from_fork+0x16d/0x250
[   47.260172]  ? kthread_park+0xa0/0xa0
[   47.260203]  ret_from_fork_asm+0x11/0x20
[   47.260227]  </TASK>
[   47.260243] ---[ end trace 0000000000000000 ]---