[    5.050958] ------------[ cut here ]------------
[    5.051017] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: unshare/1066
[    5.051075] Modules linked in: tcp_diag inet_diag nf_conntrack_ftp nft_ct nf_conntrack_netlink veth nft_nat nft_numgen nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables
[    5.051174] CPU: 0 UID: 0 PID: 1066 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    5.051243] Tainted: [W]=WARN
[    5.051267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.051303] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    5.051334] 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 e6 ab fb ff b9 a6 ff ff
[    5.051414] RSP: 0018:ff88a061c09f3cc0 EFLAGS: 00010286
[    5.051443] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    5.051486] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff35eccd8188ea00
[    5.051529] RBP: 0000000000000000 R08: ff35eccd8305a550 R09: ff35eccd84aae02c
[    5.051573] R10: ff35eccd84aaf120 R11: fefefefefefefeff R12: 0000000000000000
[    5.051614] R13: 0000000000000010 R14: ff35eccd84aaf000 R15: ff35eccd8188ea00
[    5.051651] FS:  00007f6685461740(0000) GS:ff35ecce32c8c000(0000) knlGS:0000000000000000
[    5.051698] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.051730] CR2: 000055a8b7369310 CR3: 000000000966f001 CR4: 0000000000771ef0
[    5.051769] PKRU: 55555554
[    5.051785] Call Trace:
[    5.051800]  <TASK>
[    5.051814]  rtmsg_ifinfo+0x3c/0xa0
[    5.051833]  register_netdevice+0x889/0x9f0
[    5.051855]  register_netdev+0x1e/0x30
[    5.051880]  loopback_net_init+0x57/0xb0
[    5.051900]  ops_init+0x68/0x140
[    5.051923]  setup_net+0x85/0x150
[    5.051942]  copy_net_ns+0xf5/0x200
[    5.051966]  create_new_namespaces+0x117/0x2f0
[    5.051998]  unshare_nsproxy_namespaces+0x85/0xb0
[    5.052026]  ksys_unshare+0x346/0x5e0
[    5.052048]  __x64_sys_unshare+0x12/0x20
[    5.052071]  do_syscall_64+0xe0/0xfc0
[    5.052092]  ? exc_page_fault+0x83/0x1a0
[    5.052113]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    5.052144] RIP: 0033:0x7f668555cbcb
[    5.052168] 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
[    5.052268] RSP: 002b:00007fffa12523d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[    5.052309] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f668555cbcb
[    5.052356] RDX: 0000000000000000 RSI: 00007fffa1252140 RDI: 0000000040000000
[    5.052395] RBP: 00007fffa1252760 R08: 00007fffa1252330 R09: 0000000000000000
[    5.052435] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[    5.052479] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055a8b736cb68
[    5.052522]  </TASK>
[    5.052538] ---[ end trace 0000000000000000 ]---
[    5.092037] ------------[ cut here ]------------
[    5.092133] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:0/12
[    5.092237] Modules linked in: tcp_diag inet_diag nf_conntrack_ftp nft_ct nf_conntrack_netlink veth nft_nat nft_numgen nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables
[    5.092373] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[    5.092468] Tainted: [W]=WARN
[    5.092525] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.092597] Workqueue: netns cleanup_net
[    5.092658] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[    5.092723] 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 e6 ab fb ff b9 a6 ff ff
[    5.092860] RSP: 0018:ff88a061c0067c78 EFLAGS: 00010286
[    5.092947] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[    5.093027] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff35eccd83220800
[    5.093108] RBP: 0000000000000000 R08: ff35eccd8305a550 R09: ff35eccd84aa202c
[    5.093191] R10: ff35eccd84aaf120 R11: fefefefefefefeff R12: 0000000000000000
[    5.093271] R13: 0000000000000011 R14: ff35eccd84aaf000 R15: ff35eccd83220800
[    5.093359] FS:  0000000000000000(0000) GS:ff35ecce32d8c000(0000) knlGS:0000000000000000
[    5.093442] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.093512] CR2: 00007f4116726194 CR3: 000000000ac2a006 CR4: 0000000000771ef0
[    5.093596] PKRU: 55555554
[    5.093646] Call Trace:
[    5.093698]  <TASK>
[    5.093747]  unregister_netdevice_many_notify+0x877/0x9d0
[    5.093814]  default_device_exit_batch+0x2f8/0x370
[    5.093885]  ops_undo_list+0x10b/0x240
[    5.093949]  cleanup_net+0x1d7/0x2e0
[    5.094010]  process_one_work+0x162/0x360
[    5.094070]  worker_thread+0x16e/0x2d0
[    5.094132]  ? rescuer_thread+0x510/0x510
[    5.094190]  kthread+0xe1/0x120
[    5.094248]  ? kthread_park+0xa0/0xa0
[    5.094305]  ret_from_fork+0x18e/0x290
[    5.094367]  ? kthread_park+0xa0/0xa0
[    5.094424]  ret_from_fork_asm+0x11/0x20
[    5.094486]  </TASK>
[    5.094536] ---[ end trace 0000000000000000 ]---