[  320.528391] ------------[ cut here ]------------
[  320.528467] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: unshare/469
[  320.528529] Modules linked in:
[  320.528553] CPU: 0 UID: 0 PID: 469 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.528611] Tainted: [W]=WARN
[  320.528633] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.528669] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.528695] 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
[  320.528798] RSP: 0018:ff77a99b807e7cc8 EFLAGS: 00010286
[  320.528835] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  320.528882] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818ea100
[  320.528925] RBP: 0000000000000000 R08: ff2556dc831865d0 R09: ff2556dc86a9d02c
[  320.528968] R10: ff2556dc86a9b118 R11: fefefefefefefeff R12: 0000000000000000
[  320.529016] R13: 0000000000000010 R14: ff2556dc86a9b000 R15: ff2556dc818ea100
[  320.529069] FS:  00007fb0a8db3740(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  320.529121] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.529157] CR2: 00005562b14b4008 CR3: 0000000003287001 CR4: 0000000000771ef0
[  320.529199] PKRU: 55555554
[  320.529215] Call Trace:
[  320.529234]  <TASK>
[  320.529250]  rtmsg_ifinfo+0x3c/0xa0
[  320.529269]  register_netdevice+0x889/0x9f0
[  320.529294]  register_netdev+0x1e/0x30
[  320.529319]  loopback_net_init+0x57/0xb0
[  320.529344]  ? vsock_sysctl_init_net+0xb6/0x140
[  320.529380]  ops_init+0x68/0x140
[  320.529404]  setup_net+0x85/0x150
[  320.529428]  copy_net_ns+0xf5/0x200
[  320.529450]  create_new_namespaces+0x117/0x2f0
[  320.529483]  unshare_nsproxy_namespaces+0x85/0xb0
[  320.529514]  ksys_unshare+0x346/0x5e0
[  320.529537]  __x64_sys_unshare+0x12/0x20
[  320.529561]  do_syscall_64+0x104/0xfc0
[  320.529587]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.529618] RIP: 0033:0x7fb0a8eaebcb
[  320.529642] 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
[  320.529742] RSP: 002b:00007ffc001135a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  320.529784] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb0a8eaebcb
[  320.529830] RDX: 0000000000000000 RSI: 00007ffc00113310 RDI: 0000000040000000
[  320.529875] RBP: 00007ffc00113930 R08: 00007ffc00113500 R09: 0000000000000000
[  320.529917] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  320.529961] R13: 0000000000000000 R14: 00000000ffffffff R15: 000055627d034b68
[  320.530006]  </TASK>
[  320.530021] ---[ end trace 0000000000000000 ]---
[  320.530625] ------------[ cut here ]------------
[  320.530658] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/469
[  320.530712] Modules linked in:
[  320.530735] CPU: 0 UID: 0 PID: 469 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.530794] Tainted: [W]=WARN
[  320.530821] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.530859] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.530889] 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
[  320.530988] RSP: 0018:ff77a99b807e7d68 EFLAGS: 00010286
[  320.531019] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  320.531066] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818ea100
[  320.531109] RBP: 0000000000000000 R08: ff2556dc832d27d0 R09: ff2556dc86ad6030
[  320.531148] R10: ff2556dc869c0118 R11: fefefefefefefeff R12: 0000000000000000
[  320.531193] R13: 0000000000000010 R14: ff2556dc869c0000 R15: ff2556dc818ea100
[  320.531245] FS:  0000000021b2b400(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  320.531280] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.531319] CR2: 00007f152449a000 CR3: 0000000006af0002 CR4: 0000000000771ef0
[  320.531360] PKRU: 55555554
[  320.531375] Call Trace:
[  320.531388]  <TASK>
[  320.531404]  rtmsg_ifinfo+0x3c/0xa0
[  320.531423]  register_netdevice+0x889/0x9f0
[  320.531446]  __tun_chr_ioctl+0x83c/0x16c0
[  320.531466]  ? do_sys_openat2+0x9a/0xe0
[  320.531492]  __x64_sys_ioctl+0xa1/0xe0
[  320.531515]  do_syscall_64+0x104/0xfc0
[  320.531539]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.531570] RIP: 0033:0x47cc8d
[  320.531592] 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
[  320.531694] RSP: 002b:00007ffe60d0df90 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  320.531738] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  320.531779] RDX: 00007ffe60d0e010 RSI: 00000000400454ca RDI: 0000000000000005
[  320.531825] RBP: 00007ffe60d0dfe0 R08: 0000000000000000 R09: 0000000000000000
[  320.531865] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe60d0e4e8
[  320.531907] R13: 00007ffe60d0e568 R14: 0000000000000002 R15: 0000000000543540
[  320.531959]  </TASK>
[  320.531972] ---[ end trace 0000000000000000 ]---
[  320.532011] ------------[ cut here ]------------
[  320.532042] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/469
[  320.532096] Modules linked in:
[  320.532117] CPU: 0 UID: 0 PID: 469 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.532175] Tainted: [W]=WARN
[  320.532198] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.532241] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.532275] 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
[  320.532382] RSP: 0018:ff77a99b807e7d60 EFLAGS: 00010286
[  320.532414] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  320.532461] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818ea100
[  320.532511] RBP: 0000000000000002 R08: ff2556dc832d27d0 R09: ff2556dc86ad6030
[  320.532547] R10: ff2556dc869c0118 R11: fefefefefefefeff R12: 0000000000000000
[  320.532592] R13: 0000000000000010 R14: ff2556dc869c0000 R15: ff2556dc818ea100
[  320.532635] FS:  0000000021b2b400(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  320.532683] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.532726] CR2: 00007f152449a000 CR3: 0000000006af0002 CR4: 0000000000771ef0
[  320.532769] PKRU: 55555554
[  320.532784] Call Trace:
[  320.532799]  <TASK>
[  320.532815]  rtnetlink_event+0x6e/0xb0
[  320.532835]  notifier_call_chain+0x6d/0x100
[  320.532859]  netdev_update_features+0x56/0x60
[  320.532894]  __tun_chr_ioctl+0xbf1/0x16c0
[  320.532917]  ? file_init_path+0x62/0x120
[  320.532949]  __x64_sys_ioctl+0xa1/0xe0
[  320.532970]  do_syscall_64+0x104/0xfc0
[  320.532992]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.533020] RIP: 0033:0x47cc8d
[  320.533042] 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
[  320.533145] RSP: 002b:00007ffe60d0dfd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  320.533189] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  320.533261] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  320.533303] RBP: 00007ffe60d0e020 R08: 0000000000000000 R09: 0000000000000000
[  320.533343] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe60d0e4e8
[  320.533386] R13: 00007ffe60d0e568 R14: 0000000000000002 R15: 0000000000543540
[  320.533431]  </TASK>
[  320.533446] ---[ end trace 0000000000000000 ]---
[  320.533488] ------------[ cut here ]------------
[  320.533533] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/469
[  320.533585] Modules linked in:
[  320.533605] CPU: 0 UID: 0 PID: 469 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.533659] Tainted: [W]=WARN
[  320.533679] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.533721] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.533750] 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
[  320.533855] RSP: 0018:ff77a99b807e7c10 EFLAGS: 00010286
[  320.533880] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  320.533924] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818ea100
[  320.533965] RBP: 0000000000000000 R08: ff2556dc832d27d0 R09: ff2556dc82c0b030
[  320.534006] R10: ff2556dc869c0118 R11: fefefefefefefeff R12: 0000000000000000
[  320.534048] R13: 0000000000000010 R14: ff2556dc869c0000 R15: ff2556dc818ea100
[  320.534091] FS:  0000000021b2b400(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  320.534133] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.534170] CR2: 00007f152449a000 CR3: 0000000006af0002 CR4: 0000000000771ef0
[  320.534212] PKRU: 55555554
[  320.534236] Call Trace:
[  320.534251]  <TASK>
[  320.534266]  rtmsg_ifinfo+0x3c/0xa0
[  320.534289]  __dev_notify_flags+0xb1/0xf0
[  320.534313]  netif_change_flags+0x54/0x70
[  320.534339]  dev_change_flags+0x45/0x80
[  320.534361]  devinet_ioctl+0x607/0x7f0
[  320.534382]  inet_ioctl+0x229/0x240
[  320.534405]  ? __rtnl_unlock+0x35/0x60
[  320.534427]  sock_do_ioctl+0x75/0x140
[  320.534449]  __x64_sys_ioctl+0xa1/0xe0
[  320.534472]  do_syscall_64+0x104/0xfc0
[  320.534494]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.534517] RIP: 0033:0x47cc8d
[  320.534541] 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
[  320.534635] RSP: 002b:00007ffe60d0dfb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  320.534678] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  320.534723] RDX: 00007ffe60d0e020 RSI: 0000000000008914 RDI: 0000000000000006
[  320.534763] RBP: 00007ffe60d0e000 R08: 0000000000000000 R09: 0000000000000000
[  320.534807] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe60d0e4e8
[  320.534848] R13: 00007ffe60d0e568 R14: 0000000000000002 R15: 0000000000543540
[  320.534889]  </TASK>
[  320.534904] ---[ end trace 0000000000000000 ]---
[  365.516036] ------------[ cut here ]------------
[  365.516111] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/469
[  365.516177] Modules linked in:
[  365.516207] CPU: 0 UID: 0 PID: 469 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  365.516276] Tainted: [W]=WARN
[  365.516296] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  365.516330] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  365.516356] 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
[  365.516471] RSP: 0018:ff77a99b807e7b58 EFLAGS: 00010286
[  365.516503] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  365.516548] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc81d58100
[  365.516588] RBP: 0000000000000000 R08: ff2556dc832d27d0 R09: ff2556dc82c0b030
[  365.516634] R10: ff2556dc869c0118 R11: fefefefefefefeff R12: 0000000000000000
[  365.516678] R13: 0000000000000010 R14: ff2556dc869c0000 R15: ff2556dc81d58100
[  365.516726] FS:  0000000000000000(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  365.516772] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  365.517024] CR2: 00007f152449a000 CR3: 0000000004a42003 CR4: 0000000000771ef0
[  365.517070] PKRU: 55555554
[  365.517087] Call Trace:
[  365.517104]  <TASK>
[  365.517121]  rtmsg_ifinfo+0x3c/0xa0
[  365.517148]  netif_close_many+0xed/0x190
[  365.517173]  unregister_netdevice_many_notify+0x267/0x9d0
[  365.517204]  ? __queue_work+0x141/0x550
[  365.517229]  unregister_netdevice_queue+0x9e/0xd0
[  365.517261]  __tun_detach+0x591/0x5b0
[  365.517285]  tun_chr_close+0x3f/0xc0
[  365.517309]  __fput+0xe8/0x2c0
[  365.517335]  task_work_run+0x63/0xa0
[  365.517355]  do_exit+0x2c1/0xba0
[  365.517381]  ? sysvec_reschedule_ipi+0x25/0x120
[  365.517415]  do_group_exit+0x2d/0xc0
[  365.517443]  get_signal+0x82e/0x900
[  365.517468]  arch_do_signal_or_restart+0x77/0x2b0
[  365.517500]  exit_to_user_mode_loop+0x75/0x4a0
[  365.517532]  do_syscall_64+0x439/0xfc0
[  365.517556]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  365.517588] RIP: 0033:0x4c2d9e
[  365.517611] Code: Unable to access opcode bytes at 0x4c2d74.
[  365.517645] RSP: 002b:00007ffe60d0d940 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  365.517682] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  365.517722] RDX: 0000000000000014 RSI: 00007ffe60d0da20 RDI: 0000000000000007
[  365.517767] RBP: 00007ffe60d0d950 R08: 00007ffe60d0d9e0 R09: 000000000000000c
[  365.517813] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000021b33be0
[  365.517859] R13: 00007ffe60d0e568 R14: 00007ffe60d0db10 R15: 0000000000543540
[  365.517908]  </TASK>
[  365.517924] ---[ end trace 0000000000000000 ]---
[  365.518024] ------------[ cut here ]------------
[  365.518052] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: packetdrill/469
[  365.518104] Modules linked in:
[  365.518123] CPU: 0 UID: 0 PID: 469 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  365.518184] Tainted: [W]=WARN
[  365.518205] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  365.518251] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  365.518284] 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
[  365.518385] RSP: 0018:ff77a99b807e7bc8 EFLAGS: 00010286
[  365.518419] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  365.518471] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc81d58100
[  365.518510] RBP: 0000000000000000 R08: ff2556dc832d27d0 R09: ff2556dc89ef4830
[  365.518556] R10: ff2556dc869c0118 R11: fefefefefefefeff R12: 0000000000000000
[  365.518590] R13: 0000000000000011 R14: ff2556dc869c0000 R15: ff2556dc81d58100
[  365.518636] FS:  0000000000000000(0000) GS:ff2556dd07e96000(0000) knlGS:0000000000000000
[  365.518678] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  365.518715] CR2: 00007f152449a000 CR3: 0000000003279004 CR4: 0000000000771ef0
[  365.518763] PKRU: 55555554
[  365.518778] Call Trace:
[  365.518792]  <TASK>
[  365.518810]  unregister_netdevice_many_notify+0x877/0x9d0
[  365.518842]  unregister_netdevice_queue+0x9e/0xd0
[  365.518874]  __tun_detach+0x591/0x5b0
[  365.518898]  tun_chr_close+0x3f/0xc0
[  365.518922]  __fput+0xe8/0x2c0
[  365.518946]  task_work_run+0x63/0xa0
[  365.518970]  do_exit+0x2c1/0xba0
[  365.518992]  ? sysvec_reschedule_ipi+0x25/0x120
[  365.519022]  do_group_exit+0x2d/0xc0
[  365.519043]  get_signal+0x82e/0x900
[  365.519072]  arch_do_signal_or_restart+0x77/0x2b0
[  365.519106]  exit_to_user_mode_loop+0x75/0x4a0
[  365.519134]  do_syscall_64+0x439/0xfc0
[  365.519157]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  365.519187] RIP: 0033:0x4c2d9e
[  365.519211] Code: Unable to access opcode bytes at 0x4c2d74.
[  365.519246] RSP: 002b:00007ffe60d0d940 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  365.519287] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  365.519327] RDX: 0000000000000014 RSI: 00007ffe60d0da20 RDI: 0000000000000007
[  365.519368] RBP: 00007ffe60d0d950 R08: 00007ffe60d0d9e0 R09: 000000000000000c
[  365.519409] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000021b33be0
[  365.519456] R13: 00007ffe60d0e568 R14: 00007ffe60d0db10 R15: 0000000000543540
[  365.519501]  </TASK>
[  365.519513] ---[ end trace 0000000000000000 ]---
[  365.527939] ------------[ cut here ]------------
[  365.528008] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:1/64
[  365.528106] Modules linked in:
[  365.528164] CPU: 2 UID: 0 PID: 64 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  365.528256] Tainted: [W]=WARN
[  365.528312] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  365.528382] Workqueue: netns cleanup_net
[  365.528451] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  365.528516] 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
[  365.528650] RSP: 0018:ff77a99b80237c78 EFLAGS: 00010286
[  365.528715] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  365.528791] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc81d57f00
[  365.528876] RBP: 0000000000000000 R08: ff2556dc831865d0 R09: ff2556dc81d1302c
[  365.528954] R10: ff2556dc86a9b118 R11: fefefefefefefeff R12: 0000000000000000
[  365.529034] R13: 0000000000000011 R14: ff2556dc86a9b000 R15: ff2556dc81d57f00
[  365.529115] FS:  0000000000000000(0000) GS:ff2556dd07f96000(0000) knlGS:0000000000000000
[  365.529194] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  365.529265] CR2: 00007f167797ff98 CR3: 0000000004a42005 CR4: 0000000000771ef0
[  365.529344] PKRU: 55555554
[  365.529392] Call Trace:
[  365.529449]  <TASK>
[  365.529500]  unregister_netdevice_many_notify+0x877/0x9d0
[  365.529565]  default_device_exit_batch+0x318/0x390
[  365.529630]  ops_undo_list+0x10b/0x240
[  365.529688]  cleanup_net+0x1d7/0x2e0
[  365.529747]  process_one_work+0x162/0x360
[  365.529827]  worker_thread+0x16e/0x2d0
[  365.529886]  ? rescuer_thread+0x510/0x510
[  365.529944]  kthread+0xe1/0x120
[  365.530009]  ? kthread_park+0xa0/0xa0
[  365.530066]  ret_from_fork+0x16d/0x250
[  365.530125]  ? kthread_park+0xa0/0xa0
[  365.530183]  ret_from_fork_asm+0x11/0x20
[  365.530242]  </TASK>
[  365.530291] ---[ end trace 0000000000000000 ]---