[   93.518360] ------------[ cut here ]------------
[   93.518453] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: unshare/248
[   93.518560] Modules linked in:
[   93.518622] CPU: 2 UID: 0 PID: 248 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   93.518718] Tainted: [W]=WARN
[   93.518778] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   93.518851] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   93.518918] 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
[   93.519055] RSP: 0018:ff47935200507cc8 EFLAGS: 00010286
[   93.519123] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   93.519206] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742fa9d00
[   93.519287] RBP: 0000000000000000 R08: ff201fa743279fd0 R09: ff201fa7430c502c
[   93.519373] R10: ff201fa7430c6118 R11: fefefefefefefeff R12: 0000000000000000
[   93.519455] R13: 0000000000000010 R14: ff201fa7430c6000 R15: ff201fa742fa9d00
[   93.519546] FS:  00007f37830d0740(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[   93.519629] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   93.519702] CR2: 00007f3783292280 CR3: 00000000045c8001 CR4: 0000000000771ef0
[   93.519786] PKRU: 55555554
[   93.519837] Call Trace:
[   93.519890]  <TASK>
[   93.519942]  rtmsg_ifinfo+0x3c/0xa0
[   93.520003]  register_netdevice+0x889/0x9f0
[   93.520065]  register_netdev+0x1e/0x30
[   93.520126]  loopback_net_init+0x57/0xb0
[   93.520189]  ? vsock_sysctl_init_net+0xb6/0x140
[   93.520259]  ops_init+0x68/0x140
[   93.520322]  setup_net+0x85/0x150
[   93.520388]  copy_net_ns+0xf5/0x200
[   93.520450]  create_new_namespaces+0x117/0x2f0
[   93.520528]  unshare_nsproxy_namespaces+0x85/0xb0
[   93.520597]  ksys_unshare+0x346/0x5e0
[   93.520660]  __x64_sys_unshare+0x12/0x20
[   93.520721]  do_syscall_64+0x104/0xfc0
[   93.520784]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   93.520852] RIP: 0033:0x7f37831cbbcb
[   93.520913] 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
[   93.521049] RSP: 002b:00007ffd74a80ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[   93.521132] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f37831cbbcb
[   93.521213] RDX: 0000000000000000 RSI: 00007ffd74a80c30 RDI: 0000000040000000
[   93.521295] RBP: 00007ffd74a81250 R08: 00007ffd74a80e20 R09: 0000000000000000
[   93.521381] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[   93.521462] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000556d2c56eb68
[   93.521555]  </TASK>
[   93.521607] ---[ end trace 0000000000000000 ]---
[   93.522358] ------------[ cut here ]------------
[   93.522434] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/248
[   93.522535] Modules linked in:
[   93.522597] CPU: 2 UID: 0 PID: 248 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   93.522694] Tainted: [W]=WARN
[   93.522753] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   93.522826] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   93.522894] 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
[   93.523031] RSP: 0018:ff47935200507d68 EFLAGS: 00010286
[   93.523097] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[   93.523181] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742fa9d00
[   93.523263] RBP: 0000000000000000 R08: ff201fa743025610 R09: ff201fa741130030
[   93.523343] R10: ff201fa744538118 R11: fefefefefefefeff R12: 0000000000000000
[   93.523428] R13: 0000000000000010 R14: ff201fa744538000 R15: ff201fa742fa9d00
[   93.523520] FS:  000000001b4d9400(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[   93.523603] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   93.523676] CR2: 00007f543b0df000 CR3: 000000000469f002 CR4: 0000000000771ef0
[   93.523758] PKRU: 55555554
[   93.523809] Call Trace:
[   93.523862]  <TASK>
[   93.523915]  rtmsg_ifinfo+0x3c/0xa0
[   93.523975]  register_netdevice+0x889/0x9f0
[   93.524036]  __tun_chr_ioctl+0x83c/0x16c0
[   93.524099]  ? do_sys_openat2+0x9a/0xe0
[   93.524162]  __x64_sys_ioctl+0xa1/0xe0
[   93.524225]  do_syscall_64+0x104/0xfc0
[   93.524286]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   93.524353] RIP: 0033:0x47cc8d
[   93.524417] 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
[   93.524561] RSP: 002b:00007fff6b37f410 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   93.524642] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[   93.524722] RDX: 00007fff6b37f490 RSI: 00000000400454ca RDI: 0000000000000005
[   93.524803] RBP: 00007fff6b37f460 R08: 0000000000000000 R09: 0000000000000000
[   93.524883] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6b37f968
[   93.524963] R13: 00007fff6b37f9e8 R14: 0000000000000002 R15: 0000000000543540
[   93.525045]  </TASK>
[   93.525096] ---[ end trace 0000000000000000 ]---
[   93.525194] ------------[ cut here ]------------
[   93.525260] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/248
[   93.525350] Modules linked in:
[   93.525418] CPU: 2 UID: 0 PID: 248 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   93.525525] Tainted: [W]=WARN
[   93.525584] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   93.525657] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   93.525724] 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
[   93.525860] RSP: 0018:ff47935200507d60 EFLAGS: 00010286
[   93.525930] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[   93.526009] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742fa9d00
[   93.526089] RBP: 0000000000000002 R08: ff201fa743025610 R09: ff201fa741130030
[   93.526171] R10: ff201fa744538118 R11: fefefefefefefeff R12: 0000000000000000
[   93.526251] R13: 0000000000000010 R14: ff201fa744538000 R15: ff201fa742fa9d00
[   93.526335] FS:  000000001b4d9400(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[   93.526422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   93.526502] CR2: 00007f543b0df000 CR3: 000000000469f002 CR4: 0000000000771ef0
[   93.526584] PKRU: 55555554
[   93.526635] Call Trace:
[   93.526686]  <TASK>
[   93.526737]  rtnetlink_event+0x6e/0xb0
[   93.526797]  notifier_call_chain+0x6d/0x100
[   93.526858]  netdev_update_features+0x56/0x60
[   93.526927]  __tun_chr_ioctl+0xbf1/0x16c0
[   93.526987]  ? file_init_path+0x62/0x120
[   93.527048]  __x64_sys_ioctl+0xa1/0xe0
[   93.527108]  do_syscall_64+0x104/0xfc0
[   93.527169]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   93.527236] RIP: 0033:0x47cc8d
[   93.527295] 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
[   93.527437] RSP: 002b:00007fff6b37f450 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   93.527526] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[   93.527606] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[   93.527684] RBP: 00007fff6b37f4a0 R08: 0000000000000005 R09: 0000000000001ff0
[   93.527764] R10: 0000000000000003 R11: 0000000000000246 R12: 00007fff6b37f968
[   93.527847] R13: 00007fff6b37f9e8 R14: 0000000000000002 R15: 0000000000543540
[   93.527927]  </TASK>
[   93.527979] ---[ end trace 0000000000000000 ]---
[   93.528074] ------------[ cut here ]------------
[   93.528140] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/248
[   93.528230] Modules linked in:
[   93.528290] CPU: 2 UID: 0 PID: 248 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[   93.528392] Tainted: [W]=WARN
[   93.528450] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   93.528527] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[   93.528595] 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
[   93.528731] RSP: 0018:ff47935200507c10 EFLAGS: 00010286
[   93.528798] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[   93.528878] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742fa9d00
[   93.528960] RBP: 0000000000000000 R08: ff201fa743025610 R09: ff201fa744770030
[   93.529040] R10: ff201fa744538118 R11: fefefefefefefeff R12: 0000000000000000
[   93.529122] R13: 0000000000000010 R14: ff201fa744538000 R15: ff201fa742fa9d00
[   93.529209] FS:  000000001b4d9400(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[   93.529291] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   93.529371] CR2: 00007f543b0df000 CR3: 000000000469f002 CR4: 0000000000771ef0
[   93.529454] PKRU: 55555554
[   93.529513] Call Trace:
[   93.529565]  <TASK>
[   93.529616]  rtmsg_ifinfo+0x3c/0xa0
[   93.529676]  __dev_notify_flags+0xb1/0xf0
[   93.529739]  netif_change_flags+0x54/0x70
[   93.529800]  dev_change_flags+0x45/0x80
[   93.529860]  devinet_ioctl+0x607/0x7f0
[   93.529922]  inet_ioctl+0x229/0x240
[   93.529983]  ? __rtnl_unlock+0x35/0x60
[   93.530043]  sock_do_ioctl+0x75/0x140
[   93.530107]  __x64_sys_ioctl+0xa1/0xe0
[   93.530168]  do_syscall_64+0x104/0xfc0
[   93.530229]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   93.530296] RIP: 0033:0x47cc8d
[   93.530356] 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
[   93.530503] RSP: 002b:00007fff6b37f430 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   93.530586] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[   93.530666] RDX: 00007fff6b37f4a0 RSI: 0000000000008914 RDI: 0000000000000006
[   93.530747] RBP: 00007fff6b37f480 R08: 0000000000000005 R09: 0000000000001ff0
[   93.530828] R10: 0000000000000003 R11: 0000000000000246 R12: 00007fff6b37f968
[   93.530908] R13: 00007fff6b37f9e8 R14: 0000000000000002 R15: 0000000000543540
[   93.530989]  </TASK>
[   93.531040] ---[ end trace 0000000000000000 ]---
[  138.501994] ------------[ cut here ]------------
[  138.502111] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: packetdrill/248
[  138.502216] Modules linked in:
[  138.502309] CPU: 2 UID: 0 PID: 248 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.502408] Tainted: [W]=WARN
[  138.502467] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.502554] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.502633] 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
[  138.502775] RSP: 0018:ff47935200507b58 EFLAGS: 00010286
[  138.502843] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  138.502925] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa741911800
[  138.503005] RBP: 0000000000000000 R08: ff201fa743025610 R09: ff201fa744777030
[  138.503087] R10: ff201fa744538118 R11: fefefefefefefeff R12: 0000000000000000
[  138.503171] R13: 0000000000000010 R14: ff201fa744538000 R15: ff201fa741911800
[  138.503259] FS:  0000000000000000(0000) GS:ff201fa7e8996000(0000) knlGS:0000000000000000
[  138.503345] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.503419] CR2: 00007f543b0df000 CR3: 000000001b042003 CR4: 0000000000771ef0
[  138.503726] PKRU: 55555554
[  138.503784] Call Trace:
[  138.503838]  <TASK>
[  138.503892]  rtmsg_ifinfo+0x3c/0xa0
[  138.503953]  netif_close_many+0xed/0x190
[  138.504017]  unregister_netdevice_many_notify+0x267/0x9d0
[  138.504085]  ? __queue_work+0x141/0x550
[  138.504150]  unregister_netdevice_queue+0x9e/0xd0
[  138.504218]  __tun_detach+0x591/0x5b0
[  138.504282]  tun_chr_close+0x3f/0xc0
[  138.504344]  __fput+0xe8/0x2c0
[  138.504408]  task_work_run+0x63/0xa0
[  138.504470]  do_exit+0x2c1/0xba0
[  138.504537]  ? sysvec_reschedule_ipi+0x25/0x120
[  138.504615]  do_group_exit+0x2d/0xc0
[  138.504677]  get_signal+0x82e/0x900
[  138.504771]  arch_do_signal_or_restart+0x77/0x2b0
[  138.504844]  exit_to_user_mode_loop+0x75/0x4a0
[  138.504915]  do_syscall_64+0x439/0xfc0
[  138.504976]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.505046] RIP: 0033:0x4c2d9e
[  138.505107] Code: Unable to access opcode bytes at 0x4c2d74.
[  138.505183] RSP: 002b:00007fff6b37edc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  138.505265] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[  138.505346] RDX: 0000000000000014 RSI: 00007fff6b37eea0 RDI: 0000000000000007
[  138.505427] RBP: 00007fff6b37edd0 R08: 00007fff6b37ee60 R09: 000000000000000c
[  138.505516] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff6b37f968
[  138.505605] R13: 00007fff6b37f9e8 R14: 00007fff6b37ef90 R15: 0000000000543540
[  138.505689]  </TASK>
[  138.505741] ---[ end trace 0000000000000000 ]---
[  138.505905] ------------[ cut here ]------------
[  138.505944] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/248
[  138.506002] Modules linked in:
[  138.506024] CPU: 3 UID: 0 PID: 248 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.506086] Tainted: [W]=WARN
[  138.506109] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.506148] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.506173] 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
[  138.506273] RSP: 0018:ff47935200507bc8 EFLAGS: 00010286
[  138.506306] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.506356] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa74314ca00
[  138.506402] RBP: 0000000000000000 R08: ff201fa743025610 R09: ff201fa743236030
[  138.506452] R10: ff201fa744538118 R11: fefefefefefefeff R12: 0000000000000000
[  138.506503] R13: 0000000000000011 R14: ff201fa744538000 R15: ff201fa74314ca00
[  138.506553] FS:  0000000000000000(0000) GS:ff201fa7e8a16000(0000) knlGS:0000000000000000
[  138.506606] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.506643] CR2: 00007ff0ca829680 CR3: 00000000045a1002 CR4: 0000000000771ef0
[  138.506689] PKRU: 55555554
[  138.506705] Call Trace:
[  138.506722]  <TASK>
[  138.506737]  unregister_netdevice_many_notify+0x877/0x9d0
[  138.506767]  unregister_netdevice_queue+0x9e/0xd0
[  138.506798]  __tun_detach+0x591/0x5b0
[  138.506820]  tun_chr_close+0x3f/0xc0
[  138.506842]  __fput+0xe8/0x2c0
[  138.506866]  task_work_run+0x63/0xa0
[  138.506887]  do_exit+0x2c1/0xba0
[  138.506910]  ? sysvec_reschedule_ipi+0x25/0x120
[  138.506937]  do_group_exit+0x2d/0xc0
[  138.506960]  get_signal+0x82e/0x900
[  138.506980]  arch_do_signal_or_restart+0x77/0x2b0
[  138.507011]  exit_to_user_mode_loop+0x75/0x4a0
[  138.507044]  do_syscall_64+0x439/0xfc0
[  138.507068]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.507098] RIP: 0033:0x4c2d9e
[  138.507120] Code: Unable to access opcode bytes at 0x4c2d74.
[  138.507160] RSP: 002b:00007fff6b37edc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  138.507209] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[  138.507252] RDX: 0000000000000014 RSI: 00007fff6b37eea0 RDI: 0000000000000007
[  138.507296] RBP: 00007fff6b37edd0 R08: 00007fff6b37ee60 R09: 000000000000000c
[  138.507339] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff6b37f968
[  138.507383] R13: 00007fff6b37f9e8 R14: 00007fff6b37ef90 R15: 0000000000543540
[  138.507428]  </TASK>
[  138.507442] ---[ end trace 0000000000000000 ]---
[  138.515611] ------------[ cut here ]------------
[  138.515658] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#0: kworker/u16:0/12
[  138.515729] Modules linked in:
[  138.515756] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.515816] Tainted: [W]=WARN
[  138.515840] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.515877] Workqueue: netns cleanup_net
[  138.515904] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.515940] 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
[  138.516041] RSP: 0018:ff47935200067c78 EFLAGS: 00010286
[  138.516074] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.516119] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff201fa742faa100
[  138.516165] RBP: 0000000000000000 R08: ff201fa743279fd0 R09: ff201fa74323282c
[  138.516215] R10: ff201fa7430c6118 R11: fefefefefefefeff R12: 0000000000000000
[  138.516260] R13: 0000000000000011 R14: ff201fa7430c6000 R15: ff201fa742faa100
[  138.516305] FS:  0000000000000000(0000) GS:ff201fa7e8896000(0000) knlGS:0000000000000000
[  138.516355] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.516391] CR2: 000055c453f232b8 CR3: 0000000004511004 CR4: 0000000000771ef0
[  138.516436] PKRU: 55555554
[  138.516452] Call Trace:
[  138.516468]  <TASK>
[  138.516484]  unregister_netdevice_many_notify+0x877/0x9d0
[  138.516519]  default_device_exit_batch+0x318/0x390
[  138.516548]  ops_undo_list+0x10b/0x240
[  138.516572]  cleanup_net+0x1d7/0x2e0
[  138.516600]  process_one_work+0x162/0x360
[  138.516622]  worker_thread+0x16e/0x2d0
[  138.516645]  ? rescuer_thread+0x510/0x510
[  138.516666]  kthread+0xe1/0x120
[  138.516689]  ? kthread_park+0xa0/0xa0
[  138.516716]  ret_from_fork+0x16d/0x250
[  138.516738]  ? kthread_park+0xa0/0xa0
[  138.516761]  ret_from_fork_asm+0x11/0x20
[  138.516785]  </TASK>
[  138.516799] ---[ end trace 0000000000000000 ]---