[  866.065814] ------------[ cut here ]------------
[  866.065859] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: unshare/1000
[  866.065919] Modules linked in:
[  866.065948] CPU: 0 UID: 0 PID: 1000 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  866.066008] Tainted: [W]=WARN
[  866.066033] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  866.066077] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  866.066108] 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
[  866.066214] RSP: 0018:ff71d8c680e5fcc8 EFLAGS: 00010286
[  866.066244] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  866.066288] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5db00
[  866.066331] RBP: 0000000000000000 R08: ff3cc9a4c198dad0 R09: ff3cc9a4c4c4202c
[  866.066374] R10: ff3cc9a4c4c10118 R11: fefefefefefefeff R12: 0000000000000000
[  866.066418] R13: 0000000000000010 R14: ff3cc9a4c4c10000 R15: ff3cc9a4c2b5db00
[  866.066466] FS:  00007f47749f8740(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  866.066510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  866.066543] CR2: 00005613404d4008 CR3: 0000000004ebf003 CR4: 0000000000771ef0
[  866.066592] PKRU: 55555554
[  866.066607] Call Trace:
[  866.066623]  <TASK>
[  866.066639]  rtmsg_ifinfo+0x3c/0xa0
[  866.066662]  register_netdevice+0x889/0x9f0
[  866.066684]  register_netdev+0x1e/0x30
[  866.066707]  loopback_net_init+0x57/0xb0
[  866.066732]  ? vsock_sysctl_init_net+0xb6/0x140
[  866.066765]  ops_init+0x68/0x140
[  866.066786]  setup_net+0x85/0x150
[  866.066810]  copy_net_ns+0xf5/0x200
[  866.066832]  create_new_namespaces+0x117/0x2f0
[  866.066858]  unshare_nsproxy_namespaces+0x85/0xb0
[  866.066886]  ksys_unshare+0x346/0x5e0
[  866.066911]  __x64_sys_unshare+0x12/0x20
[  866.066933]  do_syscall_64+0x104/0xfc0
[  866.066962]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  866.066990] RIP: 0033:0x7f4774af3bcb
[  866.067015] 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
[  866.067114] RSP: 002b:00007fff80705f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  866.067155] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4774af3bcb
[  866.067203] RDX: 0000000000000000 RSI: 00007fff80705c80 RDI: 0000000040000000
[  866.067247] RBP: 00007fff807062a0 R08: 00007fff80705e70 R09: 0000000000000000
[  866.067290] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  866.067329] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000561308cb9b68
[  866.067369]  </TASK>
[  866.067381] ---[ end trace 0000000000000000 ]---
[  866.067992] ------------[ cut here ]------------
[  866.068022] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/1000
[  866.068083] Modules linked in:
[  866.068107] CPU: 0 UID: 0 PID: 1000 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  866.068171] Tainted: [W]=WARN
[  866.068193] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  866.068231] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  866.068260] 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
[  866.068359] RSP: 0018:ff71d8c680e5fd68 EFLAGS: 00010286
[  866.068386] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  866.068425] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5db00
[  866.068468] RBP: 0000000000000000 R08: ff3cc9a4c2b7dc10 R09: ff3cc9a4c4c40030
[  866.068509] R10: ff3cc9a4c2f68118 R11: fefefefefefefeff R12: 0000000000000000
[  866.068553] R13: 0000000000000010 R14: ff3cc9a4c2f68000 R15: ff3cc9a4c2b5db00
[  866.068595] FS:  000000001ee8d400(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  866.068642] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  866.068676] CR2: 00007f45cab06000 CR3: 000000000331b004 CR4: 0000000000771ef0
[  866.068725] PKRU: 55555554
[  866.068740] Call Trace:
[  866.068755]  <TASK>
[  866.068770]  rtmsg_ifinfo+0x3c/0xa0
[  866.068791]  register_netdevice+0x889/0x9f0
[  866.068816]  __tun_chr_ioctl+0x83c/0x16c0
[  866.068841]  ? do_sys_openat2+0x9a/0xe0
[  866.068867]  __x64_sys_ioctl+0xa1/0xe0
[  866.068888]  do_syscall_64+0x104/0xfc0
[  866.068914]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  866.068945] RIP: 0033:0x47cc8d
[  866.068968] 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
[  866.069065] RSP: 002b:00007ffe8708c470 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  866.069111] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  866.069154] RDX: 00007ffe8708c4f0 RSI: 00000000400454ca RDI: 0000000000000005
[  866.069202] RBP: 00007ffe8708c4c0 R08: 0000000000000000 R09: 0000000000000000
[  866.069239] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe8708c9c8
[  866.069279] R13: 00007ffe8708ca48 R14: 0000000000000002 R15: 0000000000543540
[  866.069318]  </TASK>
[  866.069332] ---[ end trace 0000000000000000 ]---
[  866.069372] ------------[ cut here ]------------
[  866.069397] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/1000
[  866.069455] Modules linked in:
[  866.069476] CPU: 0 UID: 0 PID: 1000 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  866.069534] Tainted: [W]=WARN
[  866.069554] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  866.069590] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  866.069620] 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
[  866.069711] RSP: 0018:ff71d8c680e5fd60 EFLAGS: 00010286
[  866.069742] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  866.069784] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5db00
[  866.069830] RBP: 0000000000000002 R08: ff3cc9a4c2b7dc10 R09: ff3cc9a4c4c40030
[  866.069874] R10: ff3cc9a4c2f68118 R11: fefefefefefefeff R12: 0000000000000000
[  866.069914] R13: 0000000000000010 R14: ff3cc9a4c2f68000 R15: ff3cc9a4c2b5db00
[  866.069959] FS:  000000001ee8d400(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  866.070003] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  866.070041] CR2: 00007f45cab06000 CR3: 000000000331b004 CR4: 0000000000771ef0
[  866.070088] PKRU: 55555554
[  866.070101] Call Trace:
[  866.070117]  <TASK>
[  866.070132]  rtnetlink_event+0x6e/0xb0
[  866.070152]  notifier_call_chain+0x6d/0x100
[  866.070178]  netdev_update_features+0x56/0x60
[  866.070212]  __tun_chr_ioctl+0xbf1/0x16c0
[  866.070232]  ? file_init_path+0x62/0x120
[  866.070257]  __x64_sys_ioctl+0xa1/0xe0
[  866.070279]  do_syscall_64+0x104/0xfc0
[  866.070297]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  866.070329] RIP: 0033:0x47cc8d
[  866.070349] 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
[  866.070448] RSP: 002b:00007ffe8708c4b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  866.070495] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  866.070537] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  866.070584] RBP: 00007ffe8708c500 R08: 0000000000000000 R09: 0000000000000000
[  866.070627] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe8708c9c8
[  866.070677] R13: 00007ffe8708ca48 R14: 0000000000000002 R15: 0000000000543540
[  866.070718]  </TASK>
[  866.070732] ---[ end trace 0000000000000000 ]---
[  866.070775] ------------[ cut here ]------------
[  866.070800] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/1000
[  866.070856] Modules linked in:
[  866.070879] CPU: 0 UID: 0 PID: 1000 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  866.070934] Tainted: [W]=WARN
[  866.070958] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  866.070993] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  866.071021] 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
[  866.071117] RSP: 0018:ff71d8c680e5fc10 EFLAGS: 00010286
[  866.071143] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  866.071181] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5db00
[  866.071231] RBP: 0000000000000000 R08: ff3cc9a4c2b7dc10 R09: ff3cc9a4c2e5f030
[  866.071274] R10: ff3cc9a4c2f68118 R11: fefefefefefefeff R12: 0000000000000000
[  866.071320] R13: 0000000000000010 R14: ff3cc9a4c2f68000 R15: ff3cc9a4c2b5db00
[  866.071363] FS:  000000001ee8d400(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  866.071408] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  866.071443] CR2: 00007f45cab06000 CR3: 000000000331b004 CR4: 0000000000771ef0
[  866.071487] PKRU: 55555554
[  866.071502] Call Trace:
[  866.071515]  <TASK>
[  866.071529]  rtmsg_ifinfo+0x3c/0xa0
[  866.071551]  __dev_notify_flags+0xb1/0xf0
[  866.071570]  netif_change_flags+0x54/0x70
[  866.071595]  dev_change_flags+0x45/0x80
[  866.071617]  devinet_ioctl+0x607/0x7f0
[  866.071641]  inet_ioctl+0x229/0x240
[  866.071662]  ? __rtnl_unlock+0x35/0x60
[  866.071685]  sock_do_ioctl+0x75/0x140
[  866.071715]  __x64_sys_ioctl+0xa1/0xe0
[  866.071740]  do_syscall_64+0x104/0xfc0
[  866.071762]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  866.071789] RIP: 0033:0x47cc8d
[  866.071812] 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
[  866.071914] RSP: 002b:00007ffe8708c490 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  866.071960] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  866.072007] RDX: 00007ffe8708c500 RSI: 0000000000008914 RDI: 0000000000000006
[  866.072050] RBP: 00007ffe8708c4e0 R08: 0000000000000000 R09: 0000000000000000
[  866.072091] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe8708c9c8
[  866.072133] R13: 00007ffe8708ca48 R14: 0000000000000002 R15: 0000000000543540
[  866.072174]  </TASK>
[  866.072189] ---[ end trace 0000000000000000 ]---
[  911.051897] ------------[ cut here ]------------
[  911.051963] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/1000
[  911.052045] Modules linked in:
[  911.052073] CPU: 0 UID: 0 PID: 1000 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  911.052138] Tainted: [W]=WARN
[  911.052164] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  911.052201] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  911.052233] 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
[  911.052351] RSP: 0018:ff71d8c680e5fb58 EFLAGS: 00010286
[  911.052660] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  911.052705] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5de00
[  911.052749] RBP: 0000000000000000 R08: ff3cc9a4c2b7dc10 R09: ff3cc9a4c2e5f030
[  911.052793] R10: ff3cc9a4c2f68118 R11: fefefefefefefeff R12: 0000000000000000
[  911.052838] R13: 0000000000000010 R14: ff3cc9a4c2f68000 R15: ff3cc9a4c2b5de00
[  911.052886] FS:  0000000000000000(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  911.052934] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  911.053158] CR2: 00007fffe858af00 CR3: 000000000749d006 CR4: 0000000000771ef0
[  911.053205] PKRU: 55555554
[  911.053221] Call Trace:
[  911.053240]  <TASK>
[  911.053258]  rtmsg_ifinfo+0x3c/0xa0
[  911.053281]  netif_close_many+0xed/0x190
[  911.053308]  unregister_netdevice_many_notify+0x267/0x9d0
[  911.053343]  ? __queue_work+0x141/0x550
[  911.053370]  unregister_netdevice_queue+0x9e/0xd0
[  911.053401]  __tun_detach+0x591/0x5b0
[  911.053424]  tun_chr_close+0x3f/0xc0
[  911.053447]  __fput+0xe8/0x2c0
[  911.053473]  task_work_run+0x63/0xa0
[  911.053499]  do_exit+0x2c1/0xba0
[  911.053524]  do_group_exit+0x2d/0xc0
[  911.053548]  get_signal+0x82e/0x900
[  911.053570]  ? __d_alloc+0x40/0x200
[  911.053597]  ? alloc_empty_file+0x3f/0xd0
[  911.053623]  arch_do_signal_or_restart+0x77/0x2b0
[  911.053657]  ? alloc_file_pseudo+0xc1/0x110
[  911.053678]  ? __sys_socket+0xda/0x130
[  911.053702]  exit_to_user_mode_loop+0x75/0x4a0
[  911.053734]  do_syscall_64+0x439/0xfc0
[  911.053761]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  911.053796] RIP: 0033:0x47ea2b
[  911.053818] Code: Unable to access opcode bytes at 0x47ea01.
[  911.053855] RSP: 002b:00007ffe8708bf18 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[  911.053897] RAX: 0000000000000007 RBX: 00007ffe8708bff0 RCX: 000000000047ea2b
[  911.053939] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[  911.053985] RBP: 00007ffe8708bf50 R08: 0000000000000041 R09: 000000001ee8e3e0
[  911.054026] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffe8708c9c8
[  911.054071] R13: 00007ffe8708ca48 R14: 00007ffe8708c4c8 R15: 0000000000543540
[  911.054113]  </TASK>
[  911.054126] ---[ end trace 0000000000000000 ]---
[  911.054226] ------------[ cut here ]------------
[  911.054255] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/1000
[  911.054315] Modules linked in:
[  911.054342] CPU: 0 UID: 0 PID: 1000 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  911.054403] Tainted: [W]=WARN
[  911.054426] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  911.054469] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  911.054498] 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
[  911.054594] RSP: 0018:ff71d8c680e5fbc8 EFLAGS: 00010286
[  911.054618] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  911.054664] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b5de00
[  911.054700] RBP: 0000000000000000 R08: ff3cc9a4c2b7dc10 R09: ff3cc9a4c4eb6830
[  911.054741] R10: ff3cc9a4c2f68118 R11: fefefefefefefeff R12: 0000000000000000
[  911.054782] R13: 0000000000000011 R14: ff3cc9a4c2f68000 R15: ff3cc9a4c2b5de00
[  911.054823] FS:  0000000000000000(0000) GS:ff3cc9a545e96000(0000) knlGS:0000000000000000
[  911.054866] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  911.054896] CR2: 00007fffe858af00 CR3: 000000000749d006 CR4: 0000000000771ef0
[  911.054940] PKRU: 55555554
[  911.054959] Call Trace:
[  911.054973]  <TASK>
[  911.054989]  unregister_netdevice_many_notify+0x877/0x9d0
[  911.055020]  unregister_netdevice_queue+0x9e/0xd0
[  911.055049]  __tun_detach+0x591/0x5b0
[  911.055074]  tun_chr_close+0x3f/0xc0
[  911.055095]  __fput+0xe8/0x2c0
[  911.055118]  task_work_run+0x63/0xa0
[  911.055141]  do_exit+0x2c1/0xba0
[  911.055166]  do_group_exit+0x2d/0xc0
[  911.055189]  get_signal+0x82e/0x900
[  911.055210]  ? __d_alloc+0x40/0x200
[  911.055234]  ? alloc_empty_file+0x3f/0xd0
[  911.055253]  arch_do_signal_or_restart+0x77/0x2b0
[  911.055283]  ? alloc_file_pseudo+0xc1/0x110
[  911.055312]  ? __sys_socket+0xda/0x130
[  911.055337]  exit_to_user_mode_loop+0x75/0x4a0
[  911.055368]  do_syscall_64+0x439/0xfc0
[  911.055392]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  911.055420] RIP: 0033:0x47ea2b
[  911.055440] Code: Unable to access opcode bytes at 0x47ea01.
[  911.055478] RSP: 002b:00007ffe8708bf18 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
[  911.055520] RAX: 0000000000000007 RBX: 00007ffe8708bff0 RCX: 000000000047ea2b
[  911.055567] RDX: 0000000000000000 RSI: 0000000000080003 RDI: 0000000000000010
[  911.055609] RBP: 00007ffe8708bf50 R08: 0000000000000041 R09: 000000001ee8e3e0
[  911.055656] R10: 0000000000000040 R11: 0000000000000202 R12: 00007ffe8708c9c8
[  911.055703] R13: 00007ffe8708ca48 R14: 00007ffe8708c4c8 R15: 0000000000543540
[  911.055752]  </TASK>
[  911.055768] ---[ end trace 0000000000000000 ]---
[  911.061046] ------------[ cut here ]------------
[  911.061117] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:1/65
[  911.061216] Modules linked in:
[  911.061273] CPU: 2 UID: 0 PID: 65 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  911.061368] Tainted: [W]=WARN
[  911.061423] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  911.061493] Workqueue: netns cleanup_net
[  911.061552] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  911.061616] 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
[  911.061752] RSP: 0018:ff71d8c68023fc78 EFLAGS: 00010286
[  911.061816] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  911.061893] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b4ae00
[  911.061975] RBP: 0000000000000000 R08: ff3cc9a4c198dad0 R09: ff3cc9a4c4f8e82c
[  911.062054] R10: ff3cc9a4c4c10118 R11: fefefefefefefeff R12: 0000000000000000
[  911.062133] R13: 0000000000000011 R14: ff3cc9a4c4c10000 R15: ff3cc9a4c2b4ae00
[  911.062215] FS:  0000000000000000(0000) GS:ff3cc9a545f96000(0000) knlGS:0000000000000000
[  911.062293] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  911.062367] CR2: 00007f9a627f6f98 CR3: 0000000013a42006 CR4: 0000000000771ef0
[  911.062446] PKRU: 55555554
[  911.062494] Call Trace:
[  911.062544]  <TASK>
[  911.062592]  unregister_netdevice_many_notify+0x877/0x9d0
[  911.062658]  default_device_exit_batch+0x318/0x390
[  911.062723]  ops_undo_list+0x10b/0x240
[  911.062782]  cleanup_net+0x1d7/0x2e0
[  911.062840]  process_one_work+0x162/0x360
[  911.062900]  worker_thread+0x16e/0x2d0
[  911.062965]  ? rescuer_thread+0x510/0x510
[  911.063023]  kthread+0xe1/0x120
[  911.063082]  ? kthread_park+0xa0/0xa0
[  911.063147]  ret_from_fork+0x16d/0x250
[  911.063206]  ? kthread_park+0xa0/0xa0
[  911.063264]  ret_from_fork_asm+0x11/0x20
[  911.063323]  </TASK>
[  911.063375] ---[ end trace 0000000000000000 ]---