[    2.142859] ------------[ cut here ]------------
[    2.142976] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: unshare/158
[    2.143112] Modules linked in:
[    2.143203] CPU: 2 UID: 0 PID: 158 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.143318] Tainted: [W]=WARN
[    2.143375] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.143501] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.143574] 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
[    2.143699] RSP: 0018:ff5c9d164036fcc8 EFLAGS: 00010286
[    2.143760] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.143832] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f8981de9000
[    2.143903] RBP: 0000000000000000 R08: ff135f8983030b50 R09: ff135f898499a02c
[    2.143975] R10: ff135f89830d5118 R11: fefefefefefefeff R12: 0000000000000000
[    2.144048] R13: 0000000000000010 R14: ff135f89830d5000 R15: ff135f8981de9000
[    2.144124] FS:  00007f47c1078740(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[    2.144206] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.144274] CR2: 000056344e08e310 CR3: 00000000032e0002 CR4: 0000000000771ef0
[    2.144348] PKRU: 55555554
[    2.144394] Call Trace:
[    2.144441]  <TASK>
[    2.144492]  rtmsg_ifinfo+0x3c/0xa0
[    2.144547]  register_netdevice+0x889/0x9f0
[    2.144602]  register_netdev+0x1e/0x30
[    2.144656]  loopback_net_init+0x57/0xb0
[    2.144712]  ? vsock_sysctl_init_net+0xb6/0x140
[    2.144774]  ops_init+0x68/0x140
[    2.144830]  setup_net+0x85/0x150
[    2.144885]  copy_net_ns+0xf5/0x200
[    2.144941]  create_new_namespaces+0x117/0x2f0
[    2.145004]  unshare_nsproxy_namespaces+0x85/0xb0
[    2.145066]  ksys_unshare+0x346/0x5e0
[    2.145123]  __x64_sys_unshare+0x12/0x20
[    2.145178]  do_syscall_64+0x104/0xfc0
[    2.145238]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.145299] RIP: 0033:0x7f47c1173bcb
[    2.145353] 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
[    2.145487] RSP: 002b:00007ffe9b6ad0d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    2.145562] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f47c1173bcb
[    2.145636] RDX: 0000000000000000 RSI: 00007ffe9b6ace40 RDI: 0000000040000000
[    2.145710] RBP: 00007ffe9b6ad460 R08: 00007ffe9b6ad030 R09: 0000000000000000
[    2.145784] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    2.145858] R13: 0000000000000000 R14: 00000000ffffffff R15: 000056344e091b68
[    2.145932]  </TASK>
[    2.145978] ---[ end trace 0000000000000000 ]---
[    2.149064] ------------[ cut here ]------------
[    2.149131] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/158
[    2.149219] Modules linked in:
[    2.149273] CPU: 2 UID: 0 PID: 158 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.149361] Tainted: [W]=WARN
[    2.149413] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.149484] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.149545] 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
[    2.149666] RSP: 0018:ff5c9d164036fd68 EFLAGS: 00010286
[    2.149726] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    2.149797] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f8981de9000
[    2.149869] RBP: 0000000000000000 R08: ff135f8981dd3fd0 R09: ff135f898499f030
[    2.149944] R10: ff135f89849b8118 R11: fefefefefefefeff R12: 0000000000000000
[    2.150019] R13: 0000000000000010 R14: ff135f89849b8000 R15: ff135f8981de9000
[    2.150096] FS:  000000001dc23400(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[    2.150173] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.150247] CR2: 00007f4c70b51000 CR3: 00000000032ef003 CR4: 0000000000771ef0
[    2.150322] PKRU: 55555554
[    2.150368] Call Trace:
[    2.150414]  <TASK>
[    2.150467]  rtmsg_ifinfo+0x3c/0xa0
[    2.150523]  register_netdevice+0x889/0x9f0
[    2.150577]  __tun_chr_ioctl+0x83c/0x16c0
[    2.150633]  ? do_sys_openat2+0x9a/0xe0
[    2.150688]  __x64_sys_ioctl+0xa1/0xe0
[    2.150743]  do_syscall_64+0x104/0xfc0
[    2.150798]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.150859] RIP: 0033:0x47cc8d
[    2.150912] 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
[    2.151037] RSP: 002b:00007fff6c6f72a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.151112] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.151185] RDX: 00007fff6c6f7320 RSI: 00000000400454ca RDI: 0000000000000005
[    2.151265] RBP: 00007fff6c6f72f0 R08: 0000000000000000 R09: 0000000000000000
[    2.151338] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6c6f77f8
[    2.151409] R13: 00007fff6c6f7878 R14: 0000000000000002 R15: 0000000000543540
[    2.151488]  </TASK>
[    2.151534] ---[ end trace 0000000000000000 ]---
[    2.151608] ------------[ cut here ]------------
[    2.151667] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/158
[    2.151747] Modules linked in:
[    2.151800] CPU: 2 UID: 0 PID: 158 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.151887] Tainted: [W]=WARN
[    2.151939] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.152004] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.152065] 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
[    2.152200] RSP: 0018:ff5c9d164036fd60 EFLAGS: 00010286
[    2.152260] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[    2.152331] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f8981de9000
[    2.152403] RBP: 0000000000000002 R08: ff135f8981dd3fd0 R09: ff135f898499f030
[    2.152481] R10: ff135f89849b8118 R11: fefefefefefefeff R12: 0000000000000000
[    2.152554] R13: 0000000000000010 R14: ff135f89849b8000 R15: ff135f8981de9000
[    2.152629] FS:  000000001dc23400(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[    2.152703] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.152769] CR2: 00007f4c70b51000 CR3: 00000000032ef003 CR4: 0000000000771ef0
[    2.152843] PKRU: 55555554
[    2.152888] Call Trace:
[    2.152934]  <TASK>
[    2.152980]  rtnetlink_event+0x6e/0xb0
[    2.153034]  notifier_call_chain+0x6d/0x100
[    2.153088]  netdev_update_features+0x56/0x60
[    2.153150]  __tun_chr_ioctl+0xbf1/0x16c0
[    2.153210]  ? file_init_path+0x62/0x120
[    2.153265]  __x64_sys_ioctl+0xa1/0xe0
[    2.153319]  do_syscall_64+0x104/0xfc0
[    2.153373]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.153432] RIP: 0033:0x47cc8d
[    2.153490] 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
[    2.153613] RSP: 002b:00007fff6c6f72e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.153685] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.153757] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[    2.153829] RBP: 00007fff6c6f7330 R08: 0000000000000000 R09: 0000000000000000
[    2.153902] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6c6f77f8
[    2.153975] R13: 00007fff6c6f7878 R14: 0000000000000002 R15: 0000000000543540
[    2.154049]  </TASK>
[    2.154094] ---[ end trace 0000000000000000 ]---
[    2.154170] ------------[ cut here ]------------
[    2.154233] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/158
[    2.154315] Modules linked in:
[    2.154370] CPU: 2 UID: 0 PID: 158 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    2.154457] Tainted: [W]=WARN
[    2.154516] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.154583] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    2.154643] 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
[    2.154770] RSP: 0018:ff5c9d164036fc10 EFLAGS: 00010286
[    2.154831] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[    2.154904] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f8981de9000
[    2.154977] RBP: 0000000000000000 R08: ff135f8981dd3fd0 R09: ff135f898499c030
[    2.155049] R10: ff135f89849b8118 R11: fefefefefefefeff R12: 0000000000000000
[    2.155122] R13: 0000000000000010 R14: ff135f89849b8000 R15: ff135f8981de9000
[    2.155204] FS:  000000001dc23400(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[    2.155280] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.155348] CR2: 00007f4c70b51000 CR3: 00000000032ef003 CR4: 0000000000771ef0
[    2.155423] PKRU: 55555554
[    2.155475] Call Trace:
[    2.155521]  <TASK>
[    2.155567]  rtmsg_ifinfo+0x3c/0xa0
[    2.155622]  __dev_notify_flags+0xb1/0xf0
[    2.155678]  netif_change_flags+0x54/0x70
[    2.155733]  dev_change_flags+0x45/0x80
[    2.155789]  devinet_ioctl+0x607/0x7f0
[    2.155845]  inet_ioctl+0x229/0x240
[    2.155901]  ? __rtnl_unlock+0x35/0x60
[    2.155956]  sock_do_ioctl+0x75/0x140
[    2.156011]  __x64_sys_ioctl+0xa1/0xe0
[    2.156066]  do_syscall_64+0x104/0xfc0
[    2.156121]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.156199] RIP: 0033:0x47cc8d
[    2.156253] 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
[    2.156381] RSP: 002b:00007fff6c6f72c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    2.156456] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[    2.156539] RDX: 00007fff6c6f7330 RSI: 0000000000008914 RDI: 0000000000000006
[    2.156613] RBP: 00007fff6c6f7310 R08: 0000000000000000 R09: 0000000000000000
[    2.156686] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6c6f77f8
[    2.156759] R13: 00007fff6c6f7878 R14: 0000000000000002 R15: 0000000000543540
[    2.156832]  </TASK>
[    2.156878] ---[ end trace 0000000000000000 ]---
[   47.126220] ------------[ cut here ]------------
[   47.126401] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/158
[   47.126521] Modules linked in:
[   47.126581] CPU: 2 UID: 0 PID: 158 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.126713] Tainted: [W]=WARN
[   47.126771] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.126840] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.126908] 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
[   47.127033] RSP: 0018:ff5c9d164036fb58 EFLAGS: 00010286
[   47.127099] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[   47.127184] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f89818d0500
[   47.127457] RBP: 0000000000000000 R08: ff135f8981dd3fd0 R09: ff135f898499c030
[   47.127539] R10: ff135f89849b8118 R11: fefefefefefefeff R12: 0000000000000000
[   47.127624] R13: 0000000000000010 R14: ff135f89849b8000 R15: ff135f89818d0500
[   47.127710] FS:  0000000000000000(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[   47.127791] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.127860] CR2: 00007f4c70b51000 CR3: 000000001d842006 CR4: 0000000000771ef0
[   47.127946] PKRU: 55555554
[   47.127996] Call Trace:
[   47.128044]  <TASK>
[   47.128092]  rtmsg_ifinfo+0x3c/0xa0
[   47.128150]  netif_close_many+0xed/0x190
[   47.128214]  unregister_netdevice_many_notify+0x267/0x9d0
[   47.128280]  ? __queue_work+0x141/0x550
[   47.128340]  unregister_netdevice_queue+0x9e/0xd0
[   47.128401]  __tun_detach+0x591/0x5b0
[   47.128458]  tun_chr_close+0x3f/0xc0
[   47.128511]  __fput+0xe8/0x2c0
[   47.128567]  task_work_run+0x63/0xa0
[   47.128632]  do_exit+0x2c1/0xba0
[   47.128689]  do_group_exit+0x2d/0xc0
[   47.128744]  ? __sys_sendto+0x194/0x220
[   47.128796]  get_signal+0x82e/0x900
[   47.128853]  ? irqentry_exit+0x10a/0x540
[   47.128913]  ? sysvec_reschedule_ipi+0x25/0x120
[   47.128975]  arch_do_signal_or_restart+0x77/0x2b0
[   47.129041]  exit_to_user_mode_loop+0x75/0x4a0
[   47.129109]  do_syscall_64+0x439/0xfc0
[   47.129167]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   47.129235] RIP: 0033:0x4c2d9e
[   47.129291] Code: Unable to access opcode bytes at 0x4c2d74.
[   47.129360] RSP: 002b:00007fff6c6f6c50 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   47.129440] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   47.129521] RDX: 0000000000000014 RSI: 00007fff6c6f6d30 RDI: 0000000000000007
[   47.129598] RBP: 00007fff6c6f6c60 R08: 00007fff6c6f6cf0 R09: 000000000000000c
[   47.129683] R10: 0000000000000000 R11: 0000000000000202 R12: 000000001dc2bb20
[   47.129758] R13: 00007fff6c6f7878 R14: 00007fff6c6f6e20 R15: 0000000000543540
[   47.129838]  </TASK>
[   47.129886] ---[ end trace 0000000000000000 ]---
[   47.130026] ------------[ cut here ]------------
[   47.130088] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/158
[   47.130168] Modules linked in:
[   47.130229] CPU: 2 UID: 0 PID: 158 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.130316] Tainted: [W]=WARN
[   47.130367] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.130434] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.130494] 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
[   47.130624] RSP: 0018:ff5c9d164036fbc8 EFLAGS: 00010286
[   47.130687] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   47.130760] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f89818d0500
[   47.130833] RBP: 0000000000000000 R08: ff135f8981dd3fd0 R09: ff135f89849a3830
[   47.130905] R10: ff135f89849b8118 R11: fefefefefefefeff R12: 0000000000000000
[   47.130977] R13: 0000000000000011 R14: ff135f89849b8000 R15: ff135f89818d0500
[   47.131053] FS:  0000000000000000(0000) GS:ff135f8a2cd96000(0000) knlGS:0000000000000000
[   47.131128] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.131356] CR2: 00007f4c70b51000 CR3: 000000000197d004 CR4: 0000000000771ef0
[   47.131435] PKRU: 55555554
[   47.131482] Call Trace:
[   47.131528]  <TASK>
[   47.131574]  unregister_netdevice_many_notify+0x877/0x9d0
[   47.131643]  unregister_netdevice_queue+0x9e/0xd0
[   47.131704]  __tun_detach+0x591/0x5b0
[   47.131759]  tun_chr_close+0x3f/0xc0
[   47.131814]  __fput+0xe8/0x2c0
[   47.131869]  task_work_run+0x63/0xa0
[   47.131924]  do_exit+0x2c1/0xba0
[   47.131980]  do_group_exit+0x2d/0xc0
[   47.132034]  ? __sys_sendto+0x194/0x220
[   47.132089]  get_signal+0x82e/0x900
[   47.132144]  ? irqentry_exit+0x10a/0x540
[   47.132206]  ? sysvec_reschedule_ipi+0x25/0x120
[   47.132268]  arch_do_signal_or_restart+0x77/0x2b0
[   47.132330]  exit_to_user_mode_loop+0x75/0x4a0
[   47.132393]  do_syscall_64+0x439/0xfc0
[   47.132448]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   47.132509] RIP: 0033:0x4c2d9e
[   47.132563] Code: Unable to access opcode bytes at 0x4c2d74.
[   47.132633] RSP: 002b:00007fff6c6f6c50 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   47.132707] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[   47.132781] RDX: 0000000000000014 RSI: 00007fff6c6f6d30 RDI: 0000000000000007
[   47.132853] RBP: 00007fff6c6f6c60 R08: 00007fff6c6f6cf0 R09: 000000000000000c
[   47.132926] R10: 0000000000000000 R11: 0000000000000202 R12: 000000001dc2bb20
[   47.132999] R13: 00007fff6c6f7878 R14: 00007fff6c6f6e20 R15: 0000000000543540
[   47.133072]  </TASK>
[   47.133117] ---[ end trace 0000000000000000 ]---
[   47.144274] ------------[ cut here ]------------
[   47.144303] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: kworker/u16:1/65
[   47.144367] Modules linked in:
[   47.144391] CPU: 3 UID: 0 PID: 65 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   47.144453] Tainted: [W]=WARN
[   47.144473] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.144508] Workqueue: netns cleanup_net
[   47.144529] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   47.144556] 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
[   47.144654] RSP: 0018:ff5c9d164023fc78 EFLAGS: 00010286
[   47.144681] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   47.144727] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff135f8982eff000
[   47.144760] RBP: 0000000000000000 R08: ff135f8983030b50 R09: ff135f89819ce82c
[   47.144804] R10: ff135f89830d5118 R11: fefefefefefefeff R12: 0000000000000000
[   47.144844] R13: 0000000000000011 R14: ff135f89830d5000 R15: ff135f8982eff000
[   47.144891] FS:  0000000000000000(0000) GS:ff135f8a2ce16000(0000) knlGS:0000000000000000
[   47.144934] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.144960] CR2: 00007f2207496f98 CR3: 000000001d842005 CR4: 0000000000771ef0
[   47.145002] PKRU: 55555554
[   47.145016] Call Trace:
[   47.145029]  <TASK>
[   47.145044]  unregister_netdevice_many_notify+0x877/0x9d0
[   47.145073]  default_device_exit_batch+0x318/0x390
[   47.145099]  ops_undo_list+0x10b/0x240
[   47.145120]  cleanup_net+0x1d7/0x2e0
[   47.145139]  process_one_work+0x162/0x360
[   47.145162]  worker_thread+0x16e/0x2d0
[   47.145182]  ? rescuer_thread+0x510/0x510
[   47.145205]  kthread+0xe1/0x120
[   47.145223]  ? kthread_park+0xa0/0xa0
[   47.145241]  ret_from_fork+0x16d/0x250
[   47.145264]  ? kthread_park+0xa0/0xa0
[   47.145285]  ret_from_fork_asm+0x11/0x20
[   47.145309]  </TASK>
[   47.145322] ---[ end trace 0000000000000000 ]---