[  229.524899] ------------[ cut here ]------------
[  229.524951] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: unshare/381
[  229.525007] Modules linked in:
[  229.525036] CPU: 3 UID: 0 PID: 381 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.525098] Tainted: [W]=WARN
[  229.525128] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.525166] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.525194] 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
[  229.525290] RSP: 0018:ff82f7ea80697cc8 EFLAGS: 00010286
[  229.525320] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.525365] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d84188f500
[  229.525405] RBP: 0000000000000000 R08: ff3286d842fb7f10 R09: ff3286d842d2502c
[  229.525452] R10: ff3286d843014118 R11: fefefefefefefeff R12: 0000000000000000
[  229.525495] R13: 0000000000000010 R14: ff3286d843014000 R15: ff3286d84188f500
[  229.525544] FS:  00007f2c4114f740(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  229.525589] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.525625] CR2: 00007f2c41311280 CR3: 000000000307e006 CR4: 0000000000771ef0
[  229.525665] PKRU: 55555554
[  229.525679] Call Trace:
[  229.525694]  <TASK>
[  229.525710]  rtmsg_ifinfo+0x3c/0xa0
[  229.525732]  register_netdevice+0x889/0x9f0
[  229.525754]  register_netdev+0x1e/0x30
[  229.525773]  loopback_net_init+0x57/0xb0
[  229.525795]  ? vsock_sysctl_init_net+0xb6/0x140
[  229.525824]  ops_init+0x68/0x140
[  229.525844]  setup_net+0x85/0x150
[  229.525867]  copy_net_ns+0xf5/0x200
[  229.525889]  create_new_namespaces+0x117/0x2f0
[  229.525913]  unshare_nsproxy_namespaces+0x85/0xb0
[  229.525941]  ksys_unshare+0x346/0x5e0
[  229.525966]  __x64_sys_unshare+0x12/0x20
[  229.525987]  do_syscall_64+0x104/0xfc0
[  229.526006]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.526034] RIP: 0033:0x7f2c4124abcb
[  229.526055] 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
[  229.526150] RSP: 002b:00007ffd590df668 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  229.526192] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2c4124abcb
[  229.526232] RDX: 0000000000000000 RSI: 00007ffd590df3d0 RDI: 0000000040000000
[  229.526279] RBP: 00007ffd590df9f0 R08: 00007ffd590df5c0 R09: 0000000000000000
[  229.526321] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  229.526361] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055934f572b68
[  229.526403]  </TASK>
[  229.526418] ---[ end trace 0000000000000000 ]---
[  229.527015] ------------[ cut here ]------------
[  229.527045] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.527096] Modules linked in:
[  229.527122] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.527181] Tainted: [W]=WARN
[  229.527201] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.527236] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.527273] 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
[  229.527370] RSP: 0018:ff82f7ea80697d68 EFLAGS: 00010286
[  229.527398] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  229.527436] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d84188f500
[  229.527479] RBP: 0000000000000000 R08: ff3286d8432323d0 R09: ff3286d841c18030
[  229.527520] R10: ff3286d841880118 R11: fefefefefefefeff R12: 0000000000000000
[  229.527561] R13: 0000000000000010 R14: ff3286d841880000 R15: ff3286d84188f500
[  229.527607] FS:  0000000019edb400(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  229.527656] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.527692] CR2: 00007f3687b23000 CR3: 000000000306f001 CR4: 0000000000771ef0
[  229.527736] PKRU: 55555554
[  229.527753] Call Trace:
[  229.527769]  <TASK>
[  229.527783]  rtmsg_ifinfo+0x3c/0xa0
[  229.527805]  register_netdevice+0x889/0x9f0
[  229.527825]  __tun_chr_ioctl+0x83c/0x16c0
[  229.527849]  ? do_sys_openat2+0x9a/0xe0
[  229.527875]  __x64_sys_ioctl+0xa1/0xe0
[  229.527896]  do_syscall_64+0x104/0xfc0
[  229.527916]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.527948] RIP: 0033:0x47cc8d
[  229.527968] 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
[  229.528058] RSP: 002b:00007fffbfd13c90 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.528103] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.528146] RDX: 00007fffbfd13d10 RSI: 00000000400454ca RDI: 0000000000000005
[  229.528185] RBP: 00007fffbfd13ce0 R08: 0000000000000000 R09: 0000000000000000
[  229.528227] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbfd141e8
[  229.528272] R13: 00007fffbfd14268 R14: 0000000000000002 R15: 0000000000543540
[  229.528319]  </TASK>
[  229.528335] ---[ end trace 0000000000000000 ]---
[  229.528382] ------------[ cut here ]------------
[  229.528409] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.528464] Modules linked in:
[  229.528487] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.528539] Tainted: [W]=WARN
[  229.528561] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.528598] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.528625] 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
[  229.528721] RSP: 0018:ff82f7ea80697d60 EFLAGS: 00010286
[  229.528748] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  229.528790] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d84188f500
[  229.528835] RBP: 0000000000000002 R08: ff3286d8432323d0 R09: ff3286d841c18030
[  229.528873] R10: ff3286d841880118 R11: fefefefefefefeff R12: 0000000000000000
[  229.528917] R13: 0000000000000010 R14: ff3286d841880000 R15: ff3286d84188f500
[  229.528958] FS:  0000000019edb400(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  229.528998] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.529034] CR2: 00007f3687b23000 CR3: 000000000306f001 CR4: 0000000000771ef0
[  229.529076] PKRU: 55555554
[  229.529090] Call Trace:
[  229.529106]  <TASK>
[  229.529121]  rtnetlink_event+0x6e/0xb0
[  229.529141]  notifier_call_chain+0x6d/0x100
[  229.529161]  netdev_update_features+0x56/0x60
[  229.529191]  __tun_chr_ioctl+0xbf1/0x16c0
[  229.529212]  ? file_init_path+0x62/0x120
[  229.529235]  __x64_sys_ioctl+0xa1/0xe0
[  229.529293]  do_syscall_64+0x104/0xfc0
[  229.529344]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.529368] RIP: 0033:0x47cc8d
[  229.529388] 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
[  229.529501] RSP: 002b:00007fffbfd13cd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.529544] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.529586] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  229.529626] RBP: 00007fffbfd13d20 R08: 0000000000000000 R09: 0000000000000000
[  229.529671] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbfd141e8
[  229.529714] R13: 00007fffbfd14268 R14: 0000000000000002 R15: 0000000000543540
[  229.529757]  </TASK>
[  229.529774] ---[ end trace 0000000000000000 ]---
[  229.529816] ------------[ cut here ]------------
[  229.529842] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  229.529880] Modules linked in:
[  229.529904] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  229.529958] Tainted: [W]=WARN
[  229.529979] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  229.530016] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  229.530045] 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
[  229.530136] RSP: 0018:ff82f7ea80697c10 EFLAGS: 00010286
[  229.530167] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  229.530211] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d84188f500
[  229.530260] RBP: 0000000000000000 R08: ff3286d8432323d0 R09: ff3286d841c1b030
[  229.530300] R10: ff3286d841880118 R11: fefefefefefefeff R12: 0000000000000000
[  229.530342] R13: 0000000000000010 R14: ff3286d841880000 R15: ff3286d84188f500
[  229.530385] FS:  0000000019edb400(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  229.530427] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.530463] CR2: 00007f3687b23000 CR3: 000000000306f001 CR4: 0000000000771ef0
[  229.530504] PKRU: 55555554
[  229.530523] Call Trace:
[  229.530538]  <TASK>
[  229.530552]  rtmsg_ifinfo+0x3c/0xa0
[  229.530576]  __dev_notify_flags+0xb1/0xf0
[  229.530599]  netif_change_flags+0x54/0x70
[  229.530618]  dev_change_flags+0x45/0x80
[  229.530639]  devinet_ioctl+0x607/0x7f0
[  229.530664]  inet_ioctl+0x229/0x240
[  229.530686]  ? __rtnl_unlock+0x35/0x60
[  229.530710]  sock_do_ioctl+0x75/0x140
[  229.530736]  __x64_sys_ioctl+0xa1/0xe0
[  229.530757]  do_syscall_64+0x104/0xfc0
[  229.530778]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  229.530808] RIP: 0033:0x47cc8d
[  229.530829] 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
[  229.530923] RSP: 002b:00007fffbfd13cb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  229.530959] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  229.531003] RDX: 00007fffbfd13d20 RSI: 0000000000008914 RDI: 0000000000000006
[  229.531046] RBP: 00007fffbfd13d00 R08: 0000000000000000 R09: 0000000000000000
[  229.531089] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbfd141e8
[  229.531134] R13: 00007fffbfd14268 R14: 0000000000000002 R15: 0000000000543540
[  229.531173]  </TASK>
[  229.531189] ---[ end trace 0000000000000000 ]---
[  274.511845] ------------[ cut here ]------------
[  274.511932] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  274.511987] Modules linked in:
[  274.512010] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.512065] Tainted: [W]=WARN
[  274.512088] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.512129] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.512160] 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
[  274.512250] RSP: 0018:ff82f7ea80697b58 EFLAGS: 00010286
[  274.512280] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  274.512319] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4e00
[  274.512359] RBP: 0000000000000000 R08: ff3286d8432323d0 R09: ff3286d841c1b030
[  274.512401] R10: ff3286d841880118 R11: fefefefefefefeff R12: 0000000000000000
[  274.512438] R13: 0000000000000010 R14: ff3286d841880000 R15: ff3286d842fd4e00
[  274.512482] FS:  0000000000000000(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  274.512524] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.512558] CR2: 00007fffcced8e00 CR3: 000000000328b003 CR4: 0000000000771ef0
[  274.512598] PKRU: 55555554
[  274.512612] Call Trace:
[  274.512626]  <TASK>
[  274.512643]  rtmsg_ifinfo+0x3c/0xa0
[  274.512667]  netif_close_many+0xed/0x190
[  274.512690]  unregister_netdevice_many_notify+0x267/0x9d0
[  274.512717]  ? __queue_work+0x141/0x550
[  274.512743]  unregister_netdevice_queue+0x9e/0xd0
[  274.512771]  __tun_detach+0x591/0x5b0
[  274.512796]  tun_chr_close+0x3f/0xc0
[  274.512819]  __fput+0xe8/0x2c0
[  274.512844]  task_work_run+0x63/0xa0
[  274.512866]  do_exit+0x2c1/0xba0
[  274.512889]  do_group_exit+0x2d/0xc0
[  274.512912]  get_signal+0x82e/0x900
[  274.512936]  ? __d_alloc+0x40/0x200
[  274.512963]  ? alloc_empty_file+0x3f/0xd0
[  274.512985]  arch_do_signal_or_restart+0x77/0x2b0
[  274.513014]  ? alloc_file_pseudo+0xc1/0x110
[  274.513036]  ? __sys_socket+0xda/0x130
[  274.513059]  exit_to_user_mode_loop+0x75/0x4a0
[  274.513088]  do_syscall_64+0x439/0xfc0
[  274.513117]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  274.513146] RIP: 0033:0x47ea2b
[  274.513166] Code: Unable to access opcode bytes at 0x47ea01.
[  274.513205] RSP: 002b:00007fffbfd13738 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[  274.513246] RAX: 0000000000000007 RBX: 00007fffbfd13810 RCX: 000000000047ea2b
[  274.513284] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[  274.513324] RBP: 00007fffbfd13770 R08: 0000000000000041 R09: 0000000019edc3e0
[  274.513363] R10: 0000000000000040 R11: 0000000000000202 R12: 00007fffbfd141e8
[  274.513407] R13: 00007fffbfd14268 R14: 00007fffbfd13ce8 R15: 0000000000543540
[  274.513446]  </TASK>
[  274.513460] ---[ end trace 0000000000000000 ]---
[  274.513551] ------------[ cut here ]------------
[  274.513581] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/381
[  274.513627] Modules linked in:
[  274.513650] CPU: 3 UID: 0 PID: 381 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.513701] Tainted: [W]=WARN
[  274.513720] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.513756] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.513784] 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
[  274.513873] RSP: 0018:ff82f7ea80697bc8 EFLAGS: 00010286
[  274.513899] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  274.513937] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4e00
[  274.513979] RBP: 0000000000000000 R08: ff3286d8432323d0 R09: ff3286d84721f030
[  274.514022] R10: ff3286d841880118 R11: fefefefefefefeff R12: 0000000000000000
[  274.514063] R13: 0000000000000011 R14: ff3286d841880000 R15: ff3286d842fd4e00
[  274.514106] FS:  0000000000000000(0000) GS:ff3286d8cd816000(0000) knlGS:0000000000000000
[  274.514145] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.514178] CR2: 00007f4aa0f536f0 CR3: 000000000328b003 CR4: 0000000000771ef0
[  274.514217] PKRU: 55555554
[  274.514231] Call Trace:
[  274.514246]  <TASK>
[  274.514260]  unregister_netdevice_many_notify+0x877/0x9d0
[  274.514288]  unregister_netdevice_queue+0x9e/0xd0
[  274.514314]  __tun_detach+0x591/0x5b0
[  274.514336]  tun_chr_close+0x3f/0xc0
[  274.514358]  __fput+0xe8/0x2c0
[  274.514380]  task_work_run+0x63/0xa0
[  274.514409]  do_exit+0x2c1/0xba0
[  274.514429]  do_group_exit+0x2d/0xc0
[  274.514455]  get_signal+0x82e/0x900
[  274.514477]  ? __d_alloc+0x40/0x200
[  274.514499]  ? alloc_empty_file+0x3f/0xd0
[  274.514522]  arch_do_signal_or_restart+0x77/0x2b0
[  274.514557]  ? alloc_file_pseudo+0xc1/0x110
[  274.514584]  ? __sys_socket+0xda/0x130
[  274.514609]  exit_to_user_mode_loop+0x75/0x4a0
[  274.514638]  do_syscall_64+0x439/0xfc0
[  274.514661]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  274.514690] RIP: 0033:0x47ea2b
[  274.514707] Code: Unable to access opcode bytes at 0x47ea01.
[  274.514740] RSP: 002b:00007fffbfd13738 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[  274.514783] RAX: 0000000000000007 RBX: 00007fffbfd13810 RCX: 000000000047ea2b
[  274.514824] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[  274.514865] RBP: 00007fffbfd13770 R08: 0000000000000041 R09: 0000000019edc3e0
[  274.514906] R10: 0000000000000040 R11: 0000000000000202 R12: 00007fffbfd141e8
[  274.514942] R13: 00007fffbfd14268 R14: 00007fffbfd13ce8 R15: 0000000000543540
[  274.514981]  </TASK>
[  274.514996] ---[ end trace 0000000000000000 ]---
[  274.528186] ------------[ cut here ]------------
[  274.528272] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: kworker/u16:0/12
[  274.528341] Modules linked in:
[  274.528374] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  274.528430] Tainted: [W]=WARN
[  274.528451] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  274.528490] Workqueue: netns cleanup_net
[  274.528515] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  274.528552] 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
[  274.528647] RSP: 0018:ff82f7ea80067c78 EFLAGS: 00010286
[  274.528676] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  274.528722] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3286d842fd4f00
[  274.528759] RBP: 0000000000000000 R08: ff3286d842fb7f10 R09: ff3286d846b4302c
[  274.528801] R10: ff3286d843014118 R11: fefefefefefefeff R12: 0000000000000000
[  274.528839] R13: 0000000000000011 R14: ff3286d843014000 R15: ff3286d842fd4f00
[  274.528880] FS:  0000000000000000(0000) GS:ff3286d8cd716000(0000) knlGS:0000000000000000
[  274.528922] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  274.528956] CR2: 00007fcd52438f98 CR3: 0000000030e42003 CR4: 0000000000771ef0
[  274.528997] PKRU: 55555554
[  274.529012] Call Trace:
[  274.529025]  <TASK>
[  274.529041]  unregister_netdevice_many_notify+0x877/0x9d0
[  274.529076]  default_device_exit_batch+0x318/0x390
[  274.529113]  ops_undo_list+0x10b/0x240
[  274.529140]  cleanup_net+0x1d7/0x2e0
[  274.529163]  process_one_work+0x162/0x360
[  274.529188]  worker_thread+0x16e/0x2d0
[  274.529213]  ? rescuer_thread+0x510/0x510
[  274.529234]  kthread+0xe1/0x120
[  274.529258]  ? kthread_park+0xa0/0xa0
[  274.529284]  ret_from_fork+0x16d/0x250
[  274.529306]  ? kthread_park+0xa0/0xa0
[  274.529327]  ret_from_fork_asm+0x11/0x20
[  274.529348]  </TASK>
[  274.529365] ---[ end trace 0000000000000000 ]---