[  275.073564] ------------[ cut here ]------------
[  275.073614] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: unshare/425
[  275.073671] Modules linked in:
[  275.073693] CPU: 3 UID: 0 PID: 425 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  275.073752] Tainted: [W]=WARN
[  275.073775] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.073816] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  275.073848] 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
[  275.073947] RSP: 0018:ff77a99b8071fcc8 EFLAGS: 00010286
[  275.073976] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  275.074030] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818e1200
[  275.074071] RBP: 0000000000000000 R08: ff2556dc8193f350 R09: ff2556dc86a9e02c
[  275.074112] R10: ff2556dc86ad1118 R11: fefefefefefefeff R12: 0000000000000000
[  275.074156] R13: 0000000000000010 R14: ff2556dc86ad1000 R15: ff2556dc818e1200
[  275.074196] FS:  00007faf1259a740(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  275.074241] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  275.074278] CR2: 0000558f57544008 CR3: 000000000195e005 CR4: 0000000000771ef0
[  275.074319] PKRU: 55555554
[  275.074332] Call Trace:
[  275.074345]  <TASK>
[  275.074361]  rtmsg_ifinfo+0x3c/0xa0
[  275.074383]  register_netdevice+0x889/0x9f0
[  275.074408]  register_netdev+0x1e/0x30
[  275.074431]  loopback_net_init+0x57/0xb0
[  275.074454]  ? vsock_sysctl_init_net+0xb6/0x140
[  275.074484]  ops_init+0x68/0x140
[  275.074509]  setup_net+0x85/0x150
[  275.074530]  copy_net_ns+0xf5/0x200
[  275.074553]  create_new_namespaces+0x117/0x2f0
[  275.074585]  unshare_nsproxy_namespaces+0x85/0xb0
[  275.074611]  ksys_unshare+0x346/0x5e0
[  275.074638]  __x64_sys_unshare+0x12/0x20
[  275.074660]  do_syscall_64+0x104/0xfc0
[  275.074683]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  275.074713] RIP: 0033:0x7faf12695bcb
[  275.074734] 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
[  275.074831] RSP: 002b:00007ffd151d4388 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  275.074878] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faf12695bcb
[  275.074921] RDX: 0000000000000000 RSI: 00007ffd151d40f0 RDI: 0000000040000000
[  275.074963] RBP: 00007ffd151d4710 R08: 00007ffd151d42e0 R09: 0000000000000000
[  275.075005] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  275.075054] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000558f486c1b68
[  275.075102]  </TASK>
[  275.075116] ---[ end trace 0000000000000000 ]---
[  275.075706] ------------[ cut here ]------------
[  275.075737] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/425
[  275.075791] Modules linked in:
[  275.075819] CPU: 3 UID: 0 PID: 425 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  275.075881] Tainted: [W]=WARN
[  275.075901] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.075937] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  275.075969] 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
[  275.076077] RSP: 0018:ff77a99b8071fd68 EFLAGS: 00010286
[  275.076107] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  275.076150] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818e1200
[  275.076194] RBP: 0000000000000000 R08: ff2556dc832ba110 R09: ff2556dc86ad3030
[  275.076239] R10: ff2556dc868dc118 R11: fefefefefefefeff R12: 0000000000000000
[  275.076280] R13: 0000000000000010 R14: ff2556dc868dc000 R15: ff2556dc818e1200
[  275.076326] FS:  000000000a716400(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  275.076368] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  275.076405] CR2: 00007f08a261e000 CR3: 000000000694c006 CR4: 0000000000771ef0
[  275.076450] PKRU: 55555554
[  275.076466] Call Trace:
[  275.076483]  <TASK>
[  275.076497]  rtmsg_ifinfo+0x3c/0xa0
[  275.076519]  register_netdevice+0x889/0x9f0
[  275.076541]  __tun_chr_ioctl+0x83c/0x16c0
[  275.076566]  ? do_sys_openat2+0x9a/0xe0
[  275.076589]  __x64_sys_ioctl+0xa1/0xe0
[  275.076613]  do_syscall_64+0x104/0xfc0
[  275.076636]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  275.076666] RIP: 0033:0x47cc8d
[  275.076688] 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
[  275.076787] RSP: 002b:00007fff9ce5ac80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  275.076832] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  275.076876] RDX: 00007fff9ce5ad00 RSI: 00000000400454ca RDI: 0000000000000005
[  275.076919] RBP: 00007fff9ce5acd0 R08: 0000000000000000 R09: 0000000000000000
[  275.076960] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9ce5b1d8
[  275.077002] R13: 00007fff9ce5b258 R14: 0000000000000002 R15: 0000000000543540
[  275.077046]  </TASK>
[  275.077064] ---[ end trace 0000000000000000 ]---
[  275.077107] ------------[ cut here ]------------
[  275.077135] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/425
[  275.077184] Modules linked in:
[  275.077206] CPU: 3 UID: 0 PID: 425 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  275.077266] Tainted: [W]=WARN
[  275.077289] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.077325] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  275.077355] 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
[  275.077462] RSP: 0018:ff77a99b8071fd60 EFLAGS: 00010286
[  275.077492] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  275.077534] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818e1200
[  275.077578] RBP: 0000000000000002 R08: ff2556dc832ba110 R09: ff2556dc86ad3030
[  275.077628] R10: ff2556dc868dc118 R11: fefefefefefefeff R12: 0000000000000000
[  275.077670] R13: 0000000000000010 R14: ff2556dc868dc000 R15: ff2556dc818e1200
[  275.077716] FS:  000000000a716400(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  275.077757] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  275.077794] CR2: 00007f08a261e000 CR3: 000000000694c006 CR4: 0000000000771ef0
[  275.077839] PKRU: 55555554
[  275.077854] Call Trace:
[  275.077867]  <TASK>
[  275.077881]  rtnetlink_event+0x6e/0xb0
[  275.077901]  notifier_call_chain+0x6d/0x100
[  275.077926]  netdev_update_features+0x56/0x60
[  275.077952]  __tun_chr_ioctl+0xbf1/0x16c0
[  275.077972]  ? file_init_path+0x62/0x120
[  275.077997]  __x64_sys_ioctl+0xa1/0xe0
[  275.078022]  do_syscall_64+0x104/0xfc0
[  275.078042]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  275.078072] RIP: 0033:0x47cc8d
[  275.078100] 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
[  275.078193] RSP: 002b:00007fff9ce5acc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  275.078234] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  275.078273] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  275.078314] RBP: 00007fff9ce5ad10 R08: 0000000000000000 R09: 0000000000000000
[  275.078354] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9ce5b1d8
[  275.078394] R13: 00007fff9ce5b258 R14: 0000000000000002 R15: 0000000000543540
[  275.078436]  </TASK>
[  275.078449] ---[ end trace 0000000000000000 ]---
[  275.078488] ------------[ cut here ]------------
[  275.078514] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/425
[  275.078554] Modules linked in:
[  275.078577] CPU: 3 UID: 0 PID: 425 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  275.078634] Tainted: [W]=WARN
[  275.078655] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.078693] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  275.078723] 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
[  275.078828] RSP: 0018:ff77a99b8071fc10 EFLAGS: 00010286
[  275.078859] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  275.078902] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818e1200
[  275.078945] RBP: 0000000000000000 R08: ff2556dc832ba110 R09: ff2556dc8302e030
[  275.078984] R10: ff2556dc868dc118 R11: fefefefefefefeff R12: 0000000000000000
[  275.079030] R13: 0000000000000010 R14: ff2556dc868dc000 R15: ff2556dc818e1200
[  275.079077] FS:  000000000a716400(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  275.079117] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  275.079153] CR2: 00007f08a261e000 CR3: 000000000694c006 CR4: 0000000000771ef0
[  275.079199] PKRU: 55555554
[  275.079213] Call Trace:
[  275.079225]  <TASK>
[  275.079240]  rtmsg_ifinfo+0x3c/0xa0
[  275.079262]  __dev_notify_flags+0xb1/0xf0
[  275.079287]  netif_change_flags+0x54/0x70
[  275.079310]  dev_change_flags+0x45/0x80
[  275.079332]  devinet_ioctl+0x607/0x7f0
[  275.079354]  inet_ioctl+0x229/0x240
[  275.079378]  ? __rtnl_unlock+0x35/0x60
[  275.079403]  sock_do_ioctl+0x75/0x140
[  275.079433]  __x64_sys_ioctl+0xa1/0xe0
[  275.079455]  do_syscall_64+0x104/0xfc0
[  275.079479]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  275.079506] RIP: 0033:0x47cc8d
[  275.079528] 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
[  275.079626] RSP: 002b:00007fff9ce5aca0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  275.079669] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  275.079710] RDX: 00007fff9ce5ad10 RSI: 0000000000008914 RDI: 0000000000000006
[  275.079752] RBP: 00007fff9ce5acf0 R08: 0000000000000000 R09: 0000000000000000
[  275.079794] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9ce5b1d8
[  275.079843] R13: 00007fff9ce5b258 R14: 0000000000000002 R15: 0000000000543540
[  275.079886]  </TASK>
[  275.079899] ---[ end trace 0000000000000000 ]---
[  320.059757] ------------[ cut here ]------------
[  320.059831] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/425
[  320.059894] Modules linked in:
[  320.059923] CPU: 3 UID: 0 PID: 425 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.059989] Tainted: [W]=WARN
[  320.060008] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.060048] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.060080] 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
[  320.060184] RSP: 0018:ff77a99b8071fb58 EFLAGS: 00010286
[  320.060212] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  320.060261] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc81d58000
[  320.060308] RBP: 0000000000000000 R08: ff2556dc832ba110 R09: ff2556dc8302e030
[  320.060354] R10: ff2556dc868dc118 R11: fefefefefefefeff R12: 0000000000000000
[  320.060390] R13: 0000000000000010 R14: ff2556dc868dc000 R15: ff2556dc81d58000
[  320.060442] FS:  0000000000000000(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  320.060488] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.060523] CR2: 00007f08a261e000 CR3: 0000000004a42003 CR4: 0000000000771ef0
[  320.060564] PKRU: 55555554
[  320.060580] Call Trace:
[  320.060597]  <TASK>
[  320.060613]  rtmsg_ifinfo+0x3c/0xa0
[  320.060637]  netif_close_many+0xed/0x190
[  320.060658]  unregister_netdevice_many_notify+0x267/0x9d0
[  320.060689]  ? __queue_work+0x141/0x550
[  320.060715]  unregister_netdevice_queue+0x9e/0xd0
[  320.060745]  __tun_detach+0x591/0x5b0
[  320.060767]  tun_chr_close+0x3f/0xc0
[  320.060792]  __fput+0xe8/0x2c0
[  320.060820]  task_work_run+0x63/0xa0
[  320.060845]  do_exit+0x2c1/0xba0
[  320.060872]  do_group_exit+0x2d/0xc0
[  320.060895]  ? __sys_sendto+0x194/0x220
[  320.060920]  get_signal+0x82e/0x900
[  320.060941]  arch_do_signal_or_restart+0x77/0x2b0
[  320.060975]  exit_to_user_mode_loop+0x75/0x4a0
[  320.061009]  do_syscall_64+0x439/0xfc0
[  320.061036]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.061067] RIP: 0033:0x4c2d9e
[  320.061091] Code: Unable to access opcode bytes at 0x4c2d74.
[  320.061135] RSP: 002b:00007fff9ce5a630 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  320.061177] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  320.061238] RDX: 0000000000000014 RSI: 00007fff9ce5a710 RDI: 0000000000000007
[  320.061282] RBP: 00007fff9ce5a640 R08: 00007fff9ce5a6d0 R09: 000000000000000c
[  320.061325] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000a720020
[  320.061367] R13: 00007fff9ce5b258 R14: 00007fff9ce5a800 R15: 0000000000543540
[  320.061408]  </TASK>
[  320.061425] ---[ end trace 0000000000000000 ]---
[  320.061537] ------------[ cut here ]------------
[  320.061566] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/425
[  320.061616] Modules linked in:
[  320.061640] CPU: 3 UID: 0 PID: 425 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.061697] Tainted: [W]=WARN
[  320.061720] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.061755] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.061783] 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
[  320.061885] RSP: 0018:ff77a99b8071fbc8 EFLAGS: 00010286
[  320.061914] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  320.061958] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc81d58000
[  320.062004] RBP: 0000000000000000 R08: ff2556dc832ba110 R09: ff2556dc869b8830
[  320.062039] R10: ff2556dc868dc118 R11: fefefefefefefeff R12: 0000000000000000
[  320.062084] R13: 0000000000000011 R14: ff2556dc868dc000 R15: ff2556dc81d58000
[  320.062127] FS:  0000000000000000(0000) GS:ff2556dd08016000(0000) knlGS:0000000000000000
[  320.062166] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.062207] CR2: 00007f08a261e000 CR3: 0000000002b8e001 CR4: 0000000000771ef0
[  320.062246] PKRU: 55555554
[  320.062261] Call Trace:
[  320.062276]  <TASK>
[  320.062291]  unregister_netdevice_many_notify+0x877/0x9d0
[  320.062317]  unregister_netdevice_queue+0x9e/0xd0
[  320.062345]  __tun_detach+0x591/0x5b0
[  320.062368]  tun_chr_close+0x3f/0xc0
[  320.062390]  __fput+0xe8/0x2c0
[  320.062415]  task_work_run+0x63/0xa0
[  320.062436]  do_exit+0x2c1/0xba0
[  320.062457]  do_group_exit+0x2d/0xc0
[  320.062485]  ? __sys_sendto+0x194/0x220
[  320.062506]  get_signal+0x82e/0x900
[  320.062528]  arch_do_signal_or_restart+0x77/0x2b0
[  320.062557]  exit_to_user_mode_loop+0x75/0x4a0
[  320.062587]  do_syscall_64+0x439/0xfc0
[  320.062608]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  320.062642] RIP: 0033:0x4c2d9e
[  320.062665] Code: Unable to access opcode bytes at 0x4c2d74.
[  320.062698] RSP: 002b:00007fff9ce5a630 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  320.062743] RAX: 0000000000000014 RBX: 0000000000000016 RCX: 00000000004c2d9e
[  320.062783] RDX: 0000000000000014 RSI: 00007fff9ce5a710 RDI: 0000000000000007
[  320.062825] RBP: 00007fff9ce5a640 R08: 00007fff9ce5a6d0 R09: 000000000000000c
[  320.062870] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000a720020
[  320.062913] R13: 00007fff9ce5b258 R14: 00007fff9ce5a800 R15: 0000000000543540
[  320.062955]  </TASK>
[  320.062970] ---[ end trace 0000000000000000 ]---
[  320.067942] ------------[ cut here ]------------
[  320.067984] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#1: kworker/u16:1/64
[  320.068046] Modules linked in:
[  320.068071] CPU: 1 UID: 0 PID: 64 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  320.068133] Tainted: [W]=WARN
[  320.068156] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  320.068193] Workqueue: netns cleanup_net
[  320.068224] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  320.068255] 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
[  320.068353] RSP: 0018:ff77a99b80237c78 EFLAGS: 00010286
[  320.068388] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  320.068432] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff2556dc818dbb00
[  320.068472] RBP: 0000000000000000 R08: ff2556dc8193f350 R09: ff2556dc89eae82c
[  320.068514] R10: ff2556dc86ad1118 R11: fefefefefefefeff R12: 0000000000000000
[  320.068556] R13: 0000000000000011 R14: ff2556dc86ad1000 R15: ff2556dc818dbb00
[  320.068600] FS:  0000000000000000(0000) GS:ff2556dd07f16000(0000) knlGS:0000000000000000
[  320.068643] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.068678] CR2: 00007faf2b42e770 CR3: 0000000004a42006 CR4: 0000000000771ef0
[  320.068723] PKRU: 55555554
[  320.068738] Call Trace:
[  320.068752]  <TASK>
[  320.068768]  unregister_netdevice_many_notify+0x877/0x9d0
[  320.068809]  default_device_exit_batch+0x318/0x390
[  320.068837]  ops_undo_list+0x10b/0x240
[  320.068862]  cleanup_net+0x1d7/0x2e0
[  320.068881]  process_one_work+0x162/0x360
[  320.068912]  worker_thread+0x16e/0x2d0
[  320.068941]  ? rescuer_thread+0x510/0x510
[  320.068965]  kthread+0xe1/0x120
[  320.068987]  ? kthread_park+0xa0/0xa0
[  320.069012]  ret_from_fork+0x16d/0x250
[  320.069034]  ? kthread_park+0xa0/0xa0
[  320.069054]  ret_from_fork_asm+0x11/0x20
[  320.069079]  </TASK>
[  320.069093] ---[ end trace 0000000000000000 ]---