[  229.609034] ------------[ cut here ]------------
[  229.609086] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: unshare/381
[  229.609141] Modules linked in:
[  229.609167] CPU: 3 UID: 0 PID: 381 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.609223] Tainted: [W]=WARN
[  229.609243] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.609277] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.609303] 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
[  229.609401] RSP: 0018:ff6a9ac84065fcc8 EFLAGS: 00010286
[  229.609430] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.609468] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  229.609505] RBP: 0000000000000000 R08: ff48218e838291d0 R09: ff48218e84bc502c
[  229.609547] R10: ff48218e81135118 R11: fefefefefefefeff R12: 0000000000000000
[  229.609589] R13: 0000000000000010 R14: ff48218e81135000 R15: ff48218e81debb00
[  229.609630] FS:  00007f94f531a740(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  229.609676] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.609710] CR2: 00005653afc9c008 CR3: 0000000003aab006 CR4: 0000000000771ef0
[  229.609769] PKRU: 55555554
[  229.609784] Call Trace:
[  229.609799]  <TASK>
[  229.609812]  rtmsg_ifinfo+0x3c/0xa0
[  229.609835]  register_netdevice+0x889/0x9f0
[  229.609861]  register_netdev+0x1e/0x30
[  229.609882]  loopback_net_init+0x57/0xb0
[  229.609906]  ? vsock_sysctl_init_net+0xb6/0x140
[  229.609935]  ops_init+0x68/0x140
[  229.609962]  setup_net+0x85/0x150
[  229.609983]  copy_net_ns+0xf5/0x200
[  229.610005]  create_new_namespaces+0x117/0x2f0
[  229.610034]  unshare_nsproxy_namespaces+0x85/0xb0
[  229.610063]  ksys_unshare+0x346/0x5e0
[  229.610086]  __x64_sys_unshare+0x12/0x20
[  229.610106]  do_syscall_64+0x104/0xfc0
[  229.610129]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.610155] RIP: 0033:0x7f94f5415bcb
[  229.610176] 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
[  229.610266] RSP: 002b:00007ffe2cfa3f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  229.610305] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f94f5415bcb
[  229.610345] RDX: 0000000000000000 RSI: 00007ffe2cfa3ca0 RDI: 0000000040000000
[  229.610386] RBP: 00007ffe2cfa42c0 R08: 00007ffe2cfa3e90 R09: 0000000000000000
[  229.610423] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  229.610462] R13: 0000000000000000 R14: 00000000ffffffff R15: 000056538600db68
[  229.610504]  </TASK>
[  229.610518] ---[ end trace 0000000000000000 ]---
[  229.611168] ------------[ cut here ]------------
[  229.611196] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.611245] Modules linked in:
[  229.611267] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.611320] Tainted: [W]=WARN
[  229.611346] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.611380] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.611406] 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
[  229.611492] RSP: 0018:ff6a9ac84065fd68 EFLAGS: 00010286
[  229.611522] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.611558] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  229.611595] RBP: 0000000000000000 R08: ff48218e848cac10 R09: ff48218e82060030
[  229.611636] R10: ff48218e849ec118 R11: fefefefefefefeff R12: 0000000000000000
[  229.611675] R13: 0000000000000010 R14: ff48218e849ec000 R15: ff48218e81debb00
[  229.611718] FS:  0000000012b50400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  229.611761] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.611797] CR2: 00007fd8795ba000 CR3: 0000000003977001 CR4: 0000000000771ef0
[  229.611850] PKRU: 55555554
[  229.611865] Call Trace:
[  229.611880]  <TASK>
[  229.611893]  rtmsg_ifinfo+0x3c/0xa0
[  229.611915]  register_netdevice+0x889/0x9f0
[  229.611936]  __tun_chr_ioctl+0x83c/0x16c0
[  229.611962]  ? do_sys_openat2+0x9a/0xe0
[  229.611985]  __x64_sys_ioctl+0xa1/0xe0
[  229.612008]  do_syscall_64+0x104/0xfc0
[  229.612032]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.612059] RIP: 0033:0x47cc8d
[  229.612083] 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
[  229.612170] RSP: 002b:00007ffc261ab490 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.612210] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.612249] RDX: 00007ffc261ab510 RSI: 00000000400454ca RDI: 0000000000000005
[  229.612288] RBP: 00007ffc261ab4e0 R08: 0000000000000000 R09: 0000000000000000
[  229.612326] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc261ab9e8
[  229.612366] R13: 00007ffc261aba68 R14: 0000000000000002 R15: 0000000000543540
[  229.612404]  </TASK>
[  229.612418] ---[ end trace 0000000000000000 ]---
[  229.612458] ------------[ cut here ]------------
[  229.612484] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.612534] Modules linked in:
[  229.612553] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.612608] Tainted: [W]=WARN
[  229.612629] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.612665] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.612697] 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
[  229.612792] RSP: 0018:ff6a9ac84065fd60 EFLAGS: 00010286
[  229.612821] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  229.612860] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  229.612907] RBP: 0000000000000002 R08: ff48218e848cac10 R09: ff48218e82060030
[  229.612950] R10: ff48218e849ec118 R11: fefefefefefefeff R12: 0000000000000000
[  229.612990] R13: 0000000000000010 R14: ff48218e849ec000 R15: ff48218e81debb00
[  229.613032] FS:  0000000012b50400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  229.613075] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.613110] CR2: 00007fd8795ba000 CR3: 0000000003977001 CR4: 0000000000771ef0
[  229.613153] PKRU: 55555554
[  229.613168] Call Trace:
[  229.613180]  <TASK>
[  229.613194]  rtnetlink_event+0x6e/0xb0
[  229.613215]  notifier_call_chain+0x6d/0x100
[  229.613242]  netdev_update_features+0x56/0x60
[  229.613270]  __tun_chr_ioctl+0xbf1/0x16c0
[  229.613289]  ? file_init_path+0x62/0x120
[  229.613310]  __x64_sys_ioctl+0xa1/0xe0
[  229.613329]  do_syscall_64+0x104/0xfc0
[  229.613349]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.613376] RIP: 0033:0x47cc8d
[  229.613398] 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
[  229.613502] RSP: 002b:00007ffc261ab4d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.613546] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.613591] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  229.613630] RBP: 00007ffc261ab520 R08: 0000000000000000 R09: 0000000000000000
[  229.613671] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc261ab9e8
[  229.613712] R13: 00007ffc261aba68 R14: 0000000000000002 R15: 0000000000543540
[  229.613757]  </TASK>
[  229.613771] ---[ end trace 0000000000000000 ]---
[  229.613810] ------------[ cut here ]------------
[  229.613836] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.613886] Modules linked in:
[  229.613909] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.613967] Tainted: [W]=WARN
[  229.613993] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.614032] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.614061] 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
[  229.614158] RSP: 0018:ff6a9ac84065fc10 EFLAGS: 00010286
[  229.614183] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  229.614230] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  229.614269] RBP: 0000000000000000 R08: ff48218e848cac10 R09: ff48218e82e99030
[  229.614312] R10: ff48218e849ec118 R11: fefefefefefefeff R12: 0000000000000000
[  229.614353] R13: 0000000000000010 R14: ff48218e849ec000 R15: ff48218e81debb00
[  229.614399] FS:  0000000012b50400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  229.614442] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.614470] CR2: 00007fd8795ba000 CR3: 0000000003977001 CR4: 0000000000771ef0
[  229.614510] PKRU: 55555554
[  229.614523] Call Trace:
[  229.614538]  <TASK>
[  229.614553]  rtmsg_ifinfo+0x3c/0xa0
[  229.614574]  __dev_notify_flags+0xb1/0xf0
[  229.614597]  netif_change_flags+0x54/0x70
[  229.614622]  dev_change_flags+0x45/0x80
[  229.614642]  devinet_ioctl+0x607/0x7f0
[  229.614667]  inet_ioctl+0x229/0x240
[  229.614690]  ? __rtnl_unlock+0x35/0x60
[  229.614711]  sock_do_ioctl+0x75/0x140
[  229.614739]  __x64_sys_ioctl+0xa1/0xe0
[  229.614759]  do_syscall_64+0x104/0xfc0
[  229.614783]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.614812] RIP: 0033:0x47cc8d
[  229.614846] 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
[  229.614950] RSP: 002b:00007ffc261ab4b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.614992] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.615032] RDX: 00007ffc261ab520 RSI: 0000000000008914 RDI: 0000000000000006
[  229.615071] RBP: 00007ffc261ab500 R08: 0000000000000000 R09: 0000000000000000
[  229.615112] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc261ab9e8
[  229.615151] R13: 00007ffc261aba68 R14: 0000000000000002 R15: 0000000000543540
[  229.615191]  </TASK>
[  229.615207] ---[ end trace 0000000000000000 ]---
[  274.595011] ------------[ cut here ]------------
[  274.595081] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  274.595138] Modules linked in:
[  274.595165] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.595239] Tainted: [W]=WARN
[  274.595262] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.595298] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.595329] 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
[  274.595425] RSP: 0018:ff6a9ac84065fb58 EFLAGS: 00010286
[  274.595453] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  274.595497] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e83b82f00
[  274.595538] RBP: 0000000000000000 R08: ff48218e848cac10 R09: ff48218e82e99030
[  274.595575] R10: ff48218e849ec118 R11: fefefefefefefeff R12: 0000000000000000
[  274.595616] R13: 0000000000000010 R14: ff48218e849ec000 R15: ff48218e83b82f00
[  274.595658] FS:  0000000000000000(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  274.595699] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.595738] CR2: 00007fd8795ba000 CR3: 0000000025242002 CR4: 0000000000771ef0
[  274.595778] PKRU: 55555554
[  274.595793] Call Trace:
[  274.595810]  <TASK>
[  274.595825]  rtmsg_ifinfo+0x3c/0xa0
[  274.595848]  netif_close_many+0xed/0x190
[  274.595870]  unregister_netdevice_many_notify+0x267/0x9d0
[  274.595899]  ? __queue_work+0x141/0x550
[  274.595924]  unregister_netdevice_queue+0x9e/0xd0
[  274.595950]  __tun_detach+0x591/0x5b0
[  274.595978]  tun_chr_close+0x3f/0xc0
[  274.596001]  __fput+0xe8/0x2c0
[  274.596024]  task_work_run+0x63/0xa0
[  274.596047]  do_exit+0x2c1/0xba0
[  274.596071]  do_group_exit+0x2d/0xc0
[  274.596093]  ? __sys_sendto+0x194/0x220
[  274.596115]  get_signal+0x82e/0x900
[  274.596139]  arch_do_signal_or_restart+0x77/0x2b0
[  274.596169]  exit_to_user_mode_loop+0x75/0x4a0
[  274.596198]  do_syscall_64+0x439/0xfc0
[  274.596223]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  274.596253] RIP: 0033:0x4c2d9e
[  274.596276] Code: Unable to access opcode bytes at 0x4c2d74.
[  274.596310] RSP: 002b:00007ffc261aae40 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  274.596351] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  274.596387] RDX: 0000000000000014 RSI: 00007ffc261aaf20 RDI: 0000000000000007
[  274.596426] RBP: 00007ffc261aae50 R08: 00007ffc261aaee0 R09: 000000000000000c
[  274.596463] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000012b5bbf0
[  274.596506] R13: 00007ffc261aba68 R14: 00007ffc261ab010 R15: 0000000000543540
[  274.596542]  </TASK>
[  274.596557] ---[ end trace 0000000000000000 ]---
[  274.596650] ------------[ cut here ]------------
[  274.596678] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  274.596803] Modules linked in:
[  274.596830] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.596882] Tainted: [W]=WARN
[  274.596901] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.596932] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.596959] 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
[  274.597053] RSP: 0018:ff6a9ac84065fbc8 EFLAGS: 00010286
[  274.597081] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  274.597126] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e83b82f00
[  274.597165] RBP: 0000000000000000 R08: ff48218e848cac10 R09: ff48218e878a1830
[  274.597204] R10: ff48218e849ec118 R11: fefefefefefefeff R12: 0000000000000000
[  274.597245] R13: 0000000000000011 R14: ff48218e849ec000 R15: ff48218e83b82f00
[  274.597286] FS:  0000000000000000(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  274.597327] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.597358] CR2: 00007fd8795ba000 CR3: 00000000048ed003 CR4: 0000000000771ef0
[  274.597396] PKRU: 55555554
[  274.597408] Call Trace:
[  274.597422]  <TASK>
[  274.597433]  unregister_netdevice_many_notify+0x877/0x9d0
[  274.597457]  unregister_netdevice_queue+0x9e/0xd0
[  274.597486]  __tun_detach+0x591/0x5b0
[  274.597507]  tun_chr_close+0x3f/0xc0
[  274.597530]  __fput+0xe8/0x2c0
[  274.597558]  task_work_run+0x63/0xa0
[  274.597580]  do_exit+0x2c1/0xba0
[  274.597602]  do_group_exit+0x2d/0xc0
[  274.597623]  ? __sys_sendto+0x194/0x220
[  274.597644]  get_signal+0x82e/0x900
[  274.597666]  arch_do_signal_or_restart+0x77/0x2b0
[  274.597696]  exit_to_user_mode_loop+0x75/0x4a0
[  274.597733]  do_syscall_64+0x439/0xfc0
[  274.597752]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  274.597780] RIP: 0033:0x4c2d9e
[  274.597801] Code: Unable to access opcode bytes at 0x4c2d74.
[  274.597837] RSP: 002b:00007ffc261aae40 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  274.597880] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  274.597917] RDX: 0000000000000014 RSI: 00007ffc261aaf20 RDI: 0000000000000007
[  274.597956] RBP: 00007ffc261aae50 R08: 00007ffc261aaee0 R09: 000000000000000c
[  274.597999] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000012b5bbf0
[  274.598038] R13: 00007ffc261aba68 R14: 00007ffc261ab010 R15: 0000000000543540
[  274.598080]  </TASK>
[  274.598094] ---[ end trace 0000000000000000 ]---
[  274.605819] ------------[ cut here ]------------
[  274.605902] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:1/65
[  274.606005] Modules linked in:
[  274.606062] CPU: 2 UID: 0 PID: 65 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.606157] Tainted: [W]=WARN
[  274.606211] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.606282] Workqueue: netns cleanup_net
[  274.606340] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.606404] 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
[  274.606533] RSP: 0018:ff6a9ac84023fc78 EFLAGS: 00010286
[  274.606596] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  274.606672] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e8386fc00
[  274.606774] RBP: 0000000000000000 R08: ff48218e838291d0 R09: ff48218e84b5402c
[  274.606851] R10: ff48218e81135118 R11: fefefefefefefeff R12: 0000000000000000
[  274.606927] R13: 0000000000000011 R14: ff48218e81135000 R15: ff48218e8386fc00
[  274.607012] FS:  0000000000000000(0000) GS:ff48218f0c996000(0000) knlGS:0000000000000000
[  274.607090] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.607158] CR2: 000055f7f26102b8 CR3: 000000000398f002 CR4: 0000000000771ef0
[  274.607235] PKRU: 55555554
[  274.607283] Call Trace:
[  274.607331]  <TASK>
[  274.607380]  unregister_netdevice_many_notify+0x877/0x9d0
[  274.607444]  default_device_exit_batch+0x318/0x390
[  274.607507]  ops_undo_list+0x10b/0x240
[  274.607564]  cleanup_net+0x1d7/0x2e0
[  274.607622]  process_one_work+0x162/0x360
[  274.607679]  worker_thread+0x16e/0x2d0
[  274.607747]  ? rescuer_thread+0x510/0x510
[  274.607804]  kthread+0xe1/0x120
[  274.607862]  ? kthread_park+0xa0/0xa0
[  274.607930]  ret_from_fork+0x16d/0x250
[  274.607994]  ? kthread_park+0xa0/0xa0
[  274.608080]  ret_from_fork_asm+0x11/0x20
[  274.608142]  </TASK>
[  274.608192] ---[ end trace 0000000000000000 ]---