[  729.675811] ------------[ cut here ]------------
[  729.675864] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: unshare/868
[  729.675920] Modules linked in:
[  729.675952] CPU: 3 UID: 0 PID: 868 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  729.676016] Tainted: [W]=WARN
[  729.676038] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  729.676077] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  729.676109] 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
[  729.676215] RSP: 0018:ff71d8c680cbfcc8 EFLAGS: 00010286
[  729.676246] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  729.676285] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b76400
[  729.676324] RBP: 0000000000000000 R08: ff3cc9a4c336fd10 R09: ff3cc9a4c4c4102c
[  729.676365] R10: ff3cc9a4c4c42118 R11: fefefefefefefeff R12: 0000000000000000
[  729.676409] R13: 0000000000000010 R14: ff3cc9a4c4c42000 R15: ff3cc9a4c2b76400
[  729.676456] FS:  00007f5c1d742740(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  729.676500] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  729.676534] CR2: 00007f5c1d904280 CR3: 00000000033eb006 CR4: 0000000000771ef0
[  729.676575] PKRU: 55555554
[  729.676589] Call Trace:
[  729.676609]  <TASK>
[  729.676623]  rtmsg_ifinfo+0x3c/0xa0
[  729.676647]  register_netdevice+0x889/0x9f0
[  729.676669]  register_netdev+0x1e/0x30
[  729.676690]  loopback_net_init+0x57/0xb0
[  729.676715]  ? vsock_sysctl_init_net+0xb6/0x140
[  729.676747]  ops_init+0x68/0x140
[  729.676772]  setup_net+0x85/0x150
[  729.676798]  copy_net_ns+0xf5/0x200
[  729.676821]  create_new_namespaces+0x117/0x2f0
[  729.676853]  unshare_nsproxy_namespaces+0x85/0xb0
[  729.676881]  ksys_unshare+0x346/0x5e0
[  729.676906]  __x64_sys_unshare+0x12/0x20
[  729.676933]  do_syscall_64+0x104/0xfc0
[  729.676959]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  729.676989] RIP: 0033:0x7f5c1d83dbcb
[  729.677012] 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
[  729.677107] RSP: 002b:00007fff9c545b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  729.677153] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5c1d83dbcb
[  729.677193] RDX: 0000000000000000 RSI: 00007fff9c5458c0 RDI: 0000000040000000
[  729.677239] RBP: 00007fff9c545ee0 R08: 00007fff9c545ab0 R09: 0000000000000000
[  729.677285] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  729.677328] R13: 0000000000000000 R14: 00000000ffffffff R15: 00005580e4daeb68
[  729.677370]  </TASK>
[  729.677387] ---[ end trace 0000000000000000 ]---
[  729.678078] ------------[ cut here ]------------
[  729.678111] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/868
[  729.678177] Modules linked in:
[  729.678197] CPU: 3 UID: 0 PID: 868 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  729.678256] Tainted: [W]=WARN
[  729.678278] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  729.678313] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  729.678343] 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
[  729.678443] RSP: 0018:ff71d8c680cbfd68 EFLAGS: 00010286
[  729.678479] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  729.678524] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b76400
[  729.678573] RBP: 0000000000000000 R08: ff3cc9a4c1986710 R09: ff3cc9a4c4c43030
[  729.678620] R10: ff3cc9a4c3290118 R11: fefefefefefefeff R12: 0000000000000000
[  729.678661] R13: 0000000000000010 R14: ff3cc9a4c3290000 R15: ff3cc9a4c2b76400
[  729.678708] FS:  0000000014e98400(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  729.678749] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  729.678787] CR2: 00007f66236b9000 CR3: 0000000003283001 CR4: 0000000000771ef0
[  729.678839] PKRU: 55555554
[  729.678851] Call Trace:
[  729.678866]  <TASK>
[  729.678879]  rtmsg_ifinfo+0x3c/0xa0
[  729.678900]  register_netdevice+0x889/0x9f0
[  729.678920]  __tun_chr_ioctl+0x83c/0x16c0
[  729.678948]  ? do_sys_openat2+0x9a/0xe0
[  729.678974]  __x64_sys_ioctl+0xa1/0xe0
[  729.678998]  do_syscall_64+0x104/0xfc0
[  729.679022]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  729.679052] RIP: 0033:0x47cc8d
[  729.679074] 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
[  729.679171] RSP: 002b:00007ffd107680b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  729.679211] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  729.679252] RDX: 00007ffd10768130 RSI: 00000000400454ca RDI: 0000000000000005
[  729.679291] RBP: 00007ffd10768100 R08: 0000000000000000 R09: 0000000000000000
[  729.679336] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd10768608
[  729.679377] R13: 00007ffd10768688 R14: 0000000000000002 R15: 0000000000543540
[  729.679421]  </TASK>
[  729.679436] ---[ end trace 0000000000000000 ]---
[  729.679479] ------------[ cut here ]------------
[  729.679511] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/868
[  729.679558] Modules linked in:
[  729.679582] CPU: 3 UID: 0 PID: 868 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  729.679639] Tainted: [W]=WARN
[  729.679660] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  729.679701] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  729.679728] 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
[  729.679831] RSP: 0018:ff71d8c680cbfd60 EFLAGS: 00010286
[  729.679858] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  729.679900] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b76400
[  729.679944] RBP: 0000000000000002 R08: ff3cc9a4c1986710 R09: ff3cc9a4c4c43030
[  729.679993] R10: ff3cc9a4c3290118 R11: fefefefefefefeff R12: 0000000000000000
[  729.680031] R13: 0000000000000010 R14: ff3cc9a4c3290000 R15: ff3cc9a4c2b76400
[  729.680072] FS:  0000000014e98400(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  729.680110] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  729.680145] CR2: 00007f66236b9000 CR3: 0000000003283001 CR4: 0000000000771ef0
[  729.680190] PKRU: 55555554
[  729.680205] Call Trace:
[  729.680217]  <TASK>
[  729.680229]  rtnetlink_event+0x6e/0xb0
[  729.680252]  notifier_call_chain+0x6d/0x100
[  729.680275]  netdev_update_features+0x56/0x60
[  729.680306]  __tun_chr_ioctl+0xbf1/0x16c0
[  729.680327]  ? file_init_path+0x62/0x120
[  729.680350]  __x64_sys_ioctl+0xa1/0xe0
[  729.680372]  do_syscall_64+0x104/0xfc0
[  729.680396]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  729.680424] RIP: 0033:0x47cc8d
[  729.680445] 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
[  729.680545] RSP: 002b:00007ffd107680f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  729.680585] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  729.680626] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  729.680667] RBP: 00007ffd10768140 R08: 0000000000000005 R09: 0000000000001ff0
[  729.680711] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd10768608
[  729.680753] R13: 00007ffd10768688 R14: 0000000000000002 R15: 0000000000543540
[  729.680800]  </TASK>
[  729.680815] ---[ end trace 0000000000000000 ]---
[  729.680859] ------------[ cut here ]------------
[  729.680887] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/868
[  729.680936] Modules linked in:
[  729.680957] CPU: 3 UID: 0 PID: 868 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  729.681013] Tainted: [W]=WARN
[  729.681035] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  729.681071] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  729.681104] 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
[  729.681206] RSP: 0018:ff71d8c680cbfc10 EFLAGS: 00010286
[  729.681235] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  729.681275] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c2b76400
[  729.681313] RBP: 0000000000000000 R08: ff3cc9a4c1986710 R09: ff3cc9a4c2957030
[  729.681356] R10: ff3cc9a4c3290118 R11: fefefefefefefeff R12: 0000000000000000
[  729.681400] R13: 0000000000000010 R14: ff3cc9a4c3290000 R15: ff3cc9a4c2b76400
[  729.681450] FS:  0000000014e98400(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  729.681492] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  729.681527] CR2: 00007f66236b9000 CR3: 0000000003283001 CR4: 0000000000771ef0
[  729.681570] PKRU: 55555554
[  729.681585] Call Trace:
[  729.681600]  <TASK>
[  729.681614]  rtmsg_ifinfo+0x3c/0xa0
[  729.681634]  __dev_notify_flags+0xb1/0xf0
[  729.681660]  netif_change_flags+0x54/0x70
[  729.681684]  dev_change_flags+0x45/0x80
[  729.681706]  devinet_ioctl+0x607/0x7f0
[  729.681733]  inet_ioctl+0x229/0x240
[  729.681754]  ? __rtnl_unlock+0x35/0x60
[  729.681773]  sock_do_ioctl+0x75/0x140
[  729.681803]  __x64_sys_ioctl+0xa1/0xe0
[  729.681826]  do_syscall_64+0x104/0xfc0
[  729.681847]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  729.681874] RIP: 0033:0x47cc8d
[  729.681896] 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
[  729.681995] RSP: 002b:00007ffd107680d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  729.682036] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  729.682077] RDX: 00007ffd10768140 RSI: 0000000000008914 RDI: 0000000000000006
[  729.682120] RBP: 00007ffd10768120 R08: 0000000000000005 R09: 0000000000001ff0
[  729.682162] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffd10768608
[  729.682201] R13: 00007ffd10768688 R14: 0000000000000002 R15: 0000000000543540
[  729.682245]  </TASK>
[  729.682258] ---[ end trace 0000000000000000 ]---
[  774.663029] ------------[ cut here ]------------
[  774.663127] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/868
[  774.663186] Modules linked in:
[  774.663215] CPU: 3 UID: 0 PID: 868 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  774.663287] Tainted: [W]=WARN
[  774.663313] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  774.663353] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  774.663386] 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
[  774.663499] RSP: 0018:ff71d8c680cbfb58 EFLAGS: 00010286
[  774.663531] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  774.663571] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c30d0800
[  774.663612] RBP: 0000000000000000 R08: ff3cc9a4c1986710 R09: ff3cc9a4c2957030
[  774.663651] R10: ff3cc9a4c3290118 R11: fefefefefefefeff R12: 0000000000000000
[  774.663693] R13: 0000000000000010 R14: ff3cc9a4c3290000 R15: ff3cc9a4c30d0800
[  774.663735] FS:  0000000000000000(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  774.663771] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  774.663809] CR2: 00007f66236b9000 CR3: 0000000013a42002 CR4: 0000000000771ef0
[  774.663851] PKRU: 55555554
[  774.663866] Call Trace:
[  774.663882]  <TASK>
[  774.663899]  rtmsg_ifinfo+0x3c/0xa0
[  774.663921]  netif_close_many+0xed/0x190
[  774.664117]  unregister_netdevice_many_notify+0x267/0x9d0
[  774.664154]  ? __queue_work+0x141/0x550
[  774.664195]  unregister_netdevice_queue+0x9e/0xd0
[  774.664230]  __tun_detach+0x591/0x5b0
[  774.664257]  tun_chr_close+0x3f/0xc0
[  774.664279]  __fput+0xe8/0x2c0
[  774.664303]  task_work_run+0x63/0xa0
[  774.664327]  do_exit+0x2c1/0xba0
[  774.664350]  do_group_exit+0x2d/0xc0
[  774.664374]  ? __sys_sendto+0x194/0x220
[  774.664393]  get_signal+0x82e/0x900
[  774.664419]  ? sysvec_reschedule_ipi+0x25/0x120
[  774.664451]  arch_do_signal_or_restart+0x77/0x2b0
[  774.664483]  exit_to_user_mode_loop+0x75/0x4a0
[  774.664519]  do_syscall_64+0x439/0xfc0
[  774.664544]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  774.664575] RIP: 0033:0x4c2d9e
[  774.664599] Code: Unable to access opcode bytes at 0x4c2d74.
[  774.664628] RSP: 002b:00007ffd10767a60 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  774.664673] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  774.664708] RDX: 0000000000000014 RSI: 00007ffd10767b40 RDI: 0000000000000007
[  774.664748] RBP: 00007ffd10767a70 R08: 00007ffd10767b00 R09: 000000000000000c
[  774.664790] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000014ea8710
[  774.664830] R13: 00007ffd10768688 R14: 00007ffd10767c30 R15: 0000000000543540
[  774.664873]  </TASK>
[  774.664891] ---[ end trace 0000000000000000 ]---
[  774.665106] ------------[ cut here ]------------
[  774.665139] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/868
[  774.665200] Modules linked in:
[  774.665224] CPU: 3 UID: 0 PID: 868 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  774.665286] Tainted: [W]=WARN
[  774.665307] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  774.665351] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  774.665411] 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
[  774.665613] RSP: 0018:ff71d8c680cbfbc8 EFLAGS: 00010286
[  774.665642] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  774.665678] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c30d0800
[  774.665769] RBP: 0000000000000000 R08: ff3cc9a4c1986710 R09: ff3cc9a4c61f1030
[  774.665856] R10: ff3cc9a4c3290118 R11: fefefefefefefeff R12: 0000000000000000
[  774.665931] R13: 0000000000000011 R14: ff3cc9a4c3290000 R15: ff3cc9a4c30d0800
[  774.665984] FS:  0000000000000000(0000) GS:ff3cc9a546016000(0000) knlGS:0000000000000000
[  774.666025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  774.666056] CR2: 00007f811f152680 CR3: 0000000013a42002 CR4: 0000000000771ef0
[  774.666138] PKRU: 55555554
[  774.666162] Call Trace:
[  774.666191]  <TASK>
[  774.666220]  unregister_netdevice_many_notify+0x877/0x9d0
[  774.666273]  unregister_netdevice_queue+0x9e/0xd0
[  774.666326]  __tun_detach+0x591/0x5b0
[  774.666348]  tun_chr_close+0x3f/0xc0
[  774.666393]  __fput+0xe8/0x2c0
[  774.666451]  task_work_run+0x63/0xa0
[  774.666523]  do_exit+0x2c1/0xba0
[  774.666563]  do_group_exit+0x2d/0xc0
[  774.666601]  ? __sys_sendto+0x194/0x220
[  774.666625]  get_signal+0x82e/0x900
[  774.666683]  ? sysvec_reschedule_ipi+0x25/0x120
[  774.666756]  arch_do_signal_or_restart+0x77/0x2b0
[  774.666811]  exit_to_user_mode_loop+0x75/0x4a0
[  774.666864]  do_syscall_64+0x439/0xfc0
[  774.666890]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  774.666931] RIP: 0033:0x4c2d9e
[  774.666953] Code: Unable to access opcode bytes at 0x4c2d74.
[  774.667018] RSP: 002b:00007ffd10767a60 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  774.667075] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  774.667131] RDX: 0000000000000014 RSI: 00007ffd10767b40 RDI: 0000000000000007
[  774.667174] RBP: 00007ffd10767a70 R08: 00007ffd10767b00 R09: 000000000000000c
[  774.667216] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000014ea8710
[  774.667260] R13: 00007ffd10768688 R14: 00007ffd10767c30 R15: 0000000000543540
[  774.667312]  </TASK>
[  774.667332] ---[ end trace 0000000000000000 ]---
[  774.676082] ------------[ cut here ]------------
[  774.676121] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: kworker/u16:1/65
[  774.676181] Modules linked in:
[  774.676202] CPU: 1 UID: 0 PID: 65 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  774.676263] Tainted: [W]=WARN
[  774.676287] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  774.676322] Workqueue: netns cleanup_net
[  774.676349] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  774.676379] 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
[  774.676477] RSP: 0018:ff71d8c68023fc78 EFLAGS: 00010286
[  774.676507] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  774.676550] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff3cc9a4c30d0a00
[  774.676594] RBP: 0000000000000000 R08: ff3cc9a4c336fd10 R09: ff3cc9a4c618a82c
[  774.676634] R10: ff3cc9a4c4c42118 R11: fefefefefefefeff R12: 0000000000000000
[  774.676680] R13: 0000000000000011 R14: ff3cc9a4c4c42000 R15: ff3cc9a4c30d0a00
[  774.676731] FS:  0000000000000000(0000) GS:ff3cc9a545f16000(0000) knlGS:0000000000000000
[  774.676775] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  774.676815] CR2: 00005652f65682b8 CR3: 0000000003004003 CR4: 0000000000771ef0
[  774.676856] PKRU: 55555554
[  774.676871] Call Trace:
[  774.676887]  <TASK>
[  774.676902]  unregister_netdevice_many_notify+0x877/0x9d0
[  774.676938]  default_device_exit_batch+0x318/0x390
[  774.676978]  ops_undo_list+0x10b/0x240
[  774.677003]  cleanup_net+0x1d7/0x2e0
[  774.677023]  process_one_work+0x162/0x360
[  774.677047]  worker_thread+0x16e/0x2d0
[  774.677071]  ? rescuer_thread+0x510/0x510
[  774.677095]  kthread+0xe1/0x120
[  774.677115]  ? kthread_park+0xa0/0xa0
[  774.677139]  ret_from_fork+0x16d/0x250
[  774.677159]  ? kthread_park+0xa0/0xa0
[  774.677180]  ret_from_fork_asm+0x11/0x20
[  774.677204]  </TASK>
[  774.677217] ---[ end trace 0000000000000000 ]---