[  138.682007] ------------[ cut here ]------------
[  138.682054] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: unshare/293
[  138.682111] Modules linked in:
[  138.682134] CPU: 3 UID: 0 PID: 293 Comm: unshare Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.682186] Tainted: [W]=WARN
[  138.682205] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.682239] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.682271] 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
[  138.682366] RSP: 0018:ff6a9ac84056fcc8 EFLAGS: 00010286
[  138.682394] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.682438] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81dec200
[  138.682486] RBP: 0000000000000000 R08: ff48218e8192cf10 R09: ff48218e82e9802c
[  138.682529] R10: ff48218e84bc4118 R11: fefefefefefefeff R12: 0000000000000000
[  138.682580] R13: 0000000000000010 R14: ff48218e84bc4000 R15: ff48218e81dec200
[  138.682622] FS:  00007f35c63b4740(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  138.682665] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.682700] CR2: 0000563d12b9c008 CR3: 0000000001c68006 CR4: 0000000000771ef0
[  138.682750] PKRU: 55555554
[  138.682764] Call Trace:
[  138.682782]  <TASK>
[  138.682798]  rtmsg_ifinfo+0x3c/0xa0
[  138.682821]  register_netdevice+0x889/0x9f0
[  138.682844]  register_netdev+0x1e/0x30
[  138.682868]  loopback_net_init+0x57/0xb0
[  138.682898]  ? vsock_sysctl_init_net+0xb6/0x140
[  138.682928]  ops_init+0x68/0x140
[  138.682956]  setup_net+0x85/0x150
[  138.682979]  copy_net_ns+0xf5/0x200
[  138.683001]  create_new_namespaces+0x117/0x2f0
[  138.683031]  unshare_nsproxy_namespaces+0x85/0xb0
[  138.683059]  ksys_unshare+0x346/0x5e0
[  138.683086]  __x64_sys_unshare+0x12/0x20
[  138.683107]  do_syscall_64+0x104/0xfc0
[  138.683131]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.683168] RIP: 0033:0x7f35c64afbcb
[  138.683190] 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
[  138.683292] RSP: 002b:00007ffca3f00628 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
[  138.683331] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f35c64afbcb
[  138.683375] RDX: 0000000000000000 RSI: 00007ffca3f00390 RDI: 0000000040000000
[  138.683414] RBP: 00007ffca3f009b0 R08: 00007ffca3f00580 R09: 0000000000000000
[  138.683461] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000040000000
[  138.683504] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000563cde5a9b68
[  138.683545]  </TASK>
[  138.683558] ---[ end trace 0000000000000000 ]---
[  138.684164] ------------[ cut here ]------------
[  138.684196] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/293
[  138.684249] Modules linked in:
[  138.684273] CPU: 3 UID: 0 PID: 293 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.684334] Tainted: [W]=WARN
[  138.684353] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.684389] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.684417] 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
[  138.684508] RSP: 0018:ff6a9ac84056fd68 EFLAGS: 00010286
[  138.684537] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  138.684579] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81dec200
[  138.684621] RBP: 0000000000000000 R08: ff48218e8380df10 R09: ff48218e81135030
[  138.684659] R10: ff48218e83800118 R11: fefefefefefefeff R12: 0000000000000000
[  138.684699] R13: 0000000000000010 R14: ff48218e83800000 R15: ff48218e81dec200
[  138.684751] FS:  0000000026d60400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  138.684810] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.684845] CR2: 00007f7b3ab6f000 CR3: 00000000038bf001 CR4: 0000000000771ef0
[  138.684886] PKRU: 55555554
[  138.684909] Call Trace:
[  138.684921]  <TASK>
[  138.684937]  rtmsg_ifinfo+0x3c/0xa0
[  138.684960]  register_netdevice+0x889/0x9f0
[  138.684983]  __tun_chr_ioctl+0x83c/0x16c0
[  138.685007]  ? do_sys_openat2+0x9a/0xe0
[  138.685033]  __x64_sys_ioctl+0xa1/0xe0
[  138.685059]  do_syscall_64+0x104/0xfc0
[  138.685081]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.685110] RIP: 0033:0x47cc8d
[  138.685132] 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
[  138.685221] RSP: 002b:00007ffc7423eae0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.685261] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.685301] RDX: 00007ffc7423eb60 RSI: 00000000400454ca RDI: 0000000000000005
[  138.685344] RBP: 00007ffc7423eb30 R08: 0000000000000000 R09: 0000000000000000
[  138.685387] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7423f038
[  138.685429] R13: 00007ffc7423f0b8 R14: 0000000000000002 R15: 0000000000543540
[  138.685474]  </TASK>
[  138.685487] ---[ end trace 0000000000000000 ]---
[  138.685526] ------------[ cut here ]------------
[  138.685557] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/293
[  138.685614] Modules linked in:
[  138.685634] CPU: 3 UID: 0 PID: 293 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.685691] Tainted: [W]=WARN
[  138.685709] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.685743] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.685770] 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
[  138.685857] RSP: 0018:ff6a9ac84056fd60 EFLAGS: 00010286
[  138.685885] RAX: 00000000ffffffa6 RBX: 0000000000000000 RCX: 0000000000000000
[  138.685924] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81dec200
[  138.685962] RBP: 0000000000000002 R08: ff48218e8380df10 R09: ff48218e81135030
[  138.686001] R10: ff48218e83800118 R11: fefefefefefefeff R12: 0000000000000000
[  138.686042] R13: 0000000000000010 R14: ff48218e83800000 R15: ff48218e81dec200
[  138.686084] FS:  0000000026d60400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  138.686124] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.686158] CR2: 00007f7b3ab6f000 CR3: 00000000038bf001 CR4: 0000000000771ef0
[  138.686199] PKRU: 55555554
[  138.686211] Call Trace:
[  138.686224]  <TASK>
[  138.686248]  rtnetlink_event+0x6e/0xb0
[  138.686268]  notifier_call_chain+0x6d/0x100
[  138.686289]  netdev_update_features+0x56/0x60
[  138.686319]  __tun_chr_ioctl+0xbf1/0x16c0
[  138.686340]  ? file_init_path+0x62/0x120
[  138.686362]  __x64_sys_ioctl+0xa1/0xe0
[  138.686384]  do_syscall_64+0x104/0xfc0
[  138.686411]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.686437] RIP: 0033:0x47cc8d
[  138.686456] 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
[  138.686554] RSP: 002b:00007ffc7423eb20 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.686594] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.686637] RDX: 000000000000000f RSI: 00000000400454d0 RDI: 0000000000000005
[  138.686678] RBP: 00007ffc7423eb70 R08: 0000000000000005 R09: 0000000000001ff0
[  138.686723] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc7423f038
[  138.686763] R13: 00007ffc7423f0b8 R14: 0000000000000002 R15: 0000000000543540
[  138.686803]  </TASK>
[  138.686816] ---[ end trace 0000000000000000 ]---
[  138.686859] ------------[ cut here ]------------
[  138.686887] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/293
[  138.686933] Modules linked in:
[  138.686951] CPU: 3 UID: 0 PID: 293 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  138.687003] Tainted: [W]=WARN
[  138.687025] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.687059] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  138.687085] 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
[  138.687176] RSP: 0018:ff6a9ac84056fc10 EFLAGS: 00010286
[  138.687204] RAX: 00000000ffffffa6 RBX: 0000000000000001 RCX: 0000000000000000
[  138.687246] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81dec200
[  138.687286] RBP: 0000000000000000 R08: ff48218e8380df10 R09: ff48218e81da3030
[  138.687323] R10: ff48218e83800118 R11: fefefefefefefeff R12: 0000000000000000
[  138.687366] R13: 0000000000000010 R14: ff48218e83800000 R15: ff48218e81dec200
[  138.687407] FS:  0000000026d60400(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  138.687449] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  138.687487] CR2: 00007f7b3ab6f000 CR3: 00000000038bf001 CR4: 0000000000771ef0
[  138.687529] PKRU: 55555554
[  138.687550] Call Trace:
[  138.687562]  <TASK>
[  138.687576]  rtmsg_ifinfo+0x3c/0xa0
[  138.687598]  __dev_notify_flags+0xb1/0xf0
[  138.687620]  netif_change_flags+0x54/0x70
[  138.687644]  dev_change_flags+0x45/0x80
[  138.687667]  devinet_ioctl+0x607/0x7f0
[  138.687692]  inet_ioctl+0x229/0x240
[  138.687714]  ? __rtnl_unlock+0x35/0x60
[  138.687746]  sock_do_ioctl+0x75/0x140
[  138.687770]  __x64_sys_ioctl+0xa1/0xe0
[  138.687803]  do_syscall_64+0x104/0xfc0
[  138.687841]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  138.687867] RIP: 0033:0x47cc8d
[  138.687886] 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
[  138.688029] RSP: 002b:00007ffc7423eb00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  138.688082] RAX: ffffffffffffffda RBX: 000000000000000f RCX: 000000000047cc8d
[  138.688119] RDX: 00007ffc7423eb70 RSI: 0000000000008914 RDI: 0000000000000006
[  138.688194] RBP: 00007ffc7423eb50 R08: 0000000000000005 R09: 0000000000001ff0
[  138.688268] R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffc7423f038
[  138.688329] R13: 00007ffc7423f0b8 R14: 0000000000000002 R15: 0000000000543540
[  138.688367]  </TASK>
[  138.688393] ---[ end trace 0000000000000000 ]---
[  183.668573] ------------[ cut here ]------------
[  183.668659] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/293
[  183.668721] Modules linked in:
[  183.669214] CPU: 3 UID: 0 PID: 293 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.669281] Tainted: [W]=WARN
[  183.669304] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.669341] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.669375] 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
[  183.669477] RSP: 0018:ff6a9ac84056fb58 EFLAGS: 00010286
[  183.669505] RAX: 00000000ffffffa6 RBX: 0000000000000041 RCX: 0000000000000000
[  183.669547] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  183.669592] RBP: 0000000000000000 R08: ff48218e8380df10 R09: ff48218e84bc3030
[  183.669635] R10: ff48218e83800118 R11: fefefefefefefeff R12: 0000000000000000
[  183.669679] R13: 0000000000000010 R14: ff48218e83800000 R15: ff48218e81debb00
[  183.669726] FS:  0000000000000000(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  183.669774] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.669816] CR2: 00007f2e88e0a6f0 CR3: 0000000025242004 CR4: 0000000000771ef0
[  183.669857] PKRU: 55555554
[  183.669873] Call Trace:
[  183.669891]  <TASK>
[  183.669907]  rtmsg_ifinfo+0x3c/0xa0
[  183.669934]  netif_close_many+0xed/0x190
[  183.669958]  unregister_netdevice_many_notify+0x267/0x9d0
[  183.669989]  ? __queue_work+0x141/0x550
[  183.670014]  unregister_netdevice_queue+0x9e/0xd0
[  183.670045]  __tun_detach+0x591/0x5b0
[  183.670070]  tun_chr_close+0x3f/0xc0
[  183.670092]  __fput+0xe8/0x2c0
[  183.670116]  task_work_run+0x63/0xa0
[  183.670139]  do_exit+0x2c1/0xba0
[  183.670166]  do_group_exit+0x2d/0xc0
[  183.670188]  ? __sys_sendto+0x194/0x220
[  183.670212]  get_signal+0x82e/0x900
[  183.670236]  arch_do_signal_or_restart+0x77/0x2b0
[  183.670267]  exit_to_user_mode_loop+0x75/0x4a0
[  183.670298]  do_syscall_64+0x439/0xfc0
[  183.670325]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  183.670355] RIP: 0033:0x4c2d9e
[  183.670377] Code: Unable to access opcode bytes at 0x4c2d74.
[  183.670411] RSP: 002b:00007ffc7423e490 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  183.670456] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[  183.670496] RDX: 0000000000000014 RSI: 00007ffc7423e570 RDI: 0000000000000007
[  183.670535] RBP: 00007ffc7423e4a0 R08: 00007ffc7423e530 R09: 000000000000000c
[  183.670577] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc7423f038
[  183.670618] R13: 00007ffc7423f0b8 R14: 00007ffc7423e660 R15: 0000000000543540
[  183.670661]  </TASK>
[  183.670681] ---[ end trace 0000000000000000 ]---
[  183.671113] ------------[ cut here ]------------
[  183.671143] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#3: packetdrill/293
[  183.671192] Modules linked in:
[  183.671215] CPU: 3 UID: 0 PID: 293 Comm: packetdrill Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.671271] Tainted: [W]=WARN
[  183.671294] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.671327] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.671356] 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
[  183.671448] RSP: 0018:ff6a9ac84056fbc8 EFLAGS: 00010286
[  183.671479] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  183.671520] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81debb00
[  183.671562] RBP: 0000000000000000 R08: ff48218e8380df10 R09: ff48218e878a0030
[  183.671602] R10: ff48218e83800118 R11: fefefefefefefeff R12: 0000000000000000
[  183.671641] R13: 0000000000000011 R14: ff48218e83800000 R15: ff48218e81debb00
[  183.671688] FS:  0000000000000000(0000) GS:ff48218f0ca16000(0000) knlGS:0000000000000000
[  183.672028] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.672064] CR2: 00007fa64e81a620 CR3: 00000000048cb004 CR4: 0000000000771ef0
[  183.672106] PKRU: 55555554
[  183.672121] Call Trace:
[  183.672138]  <TASK>
[  183.672152]  unregister_netdevice_many_notify+0x877/0x9d0
[  183.672183]  unregister_netdevice_queue+0x9e/0xd0
[  183.672210]  __tun_detach+0x591/0x5b0
[  183.672234]  tun_chr_close+0x3f/0xc0
[  183.672257]  __fput+0xe8/0x2c0
[  183.672279]  task_work_run+0x63/0xa0
[  183.672304]  do_exit+0x2c1/0xba0
[  183.672327]  do_group_exit+0x2d/0xc0
[  183.672350]  ? __sys_sendto+0x194/0x220
[  183.672372]  get_signal+0x82e/0x900
[  183.672395]  arch_do_signal_or_restart+0x77/0x2b0
[  183.672426]  exit_to_user_mode_loop+0x75/0x4a0
[  183.672456]  do_syscall_64+0x439/0xfc0
[  183.672478]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  183.672509] RIP: 0033:0x4c2d9e
[  183.672531] Code: Unable to access opcode bytes at 0x4c2d74.
[  183.672567] RSP: 002b:00007ffc7423e490 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  183.672605] RAX: 0000000000000014 RBX: 0000000000000012 RCX: 00000000004c2d9e
[  183.672645] RDX: 0000000000000014 RSI: 00007ffc7423e570 RDI: 0000000000000007
[  183.672692] RBP: 00007ffc7423e4a0 R08: 00007ffc7423e530 R09: 000000000000000c
[  183.672745] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc7423f038
[  183.672788] R13: 00007ffc7423f0b8 R14: 00007ffc7423e660 R15: 0000000000543540
[  183.672830]  </TASK>
[  183.672842] ---[ end trace 0000000000000000 ]---
[  183.682819] ------------[ cut here ]------------
[  183.682896] WARNING: net/core/rtnetlink.c:4523 at rtmsg_ifinfo_build_skb+0xc8/0x110, CPU#2: kworker/u16:1/65
[  183.682991] Modules linked in:
[  183.683054] CPU: 2 UID: 0 PID: 65 Comm: kworker/u16:1 Tainted: G        W           7.1.0-rc4-virtme #1 PREEMPT(lazy) 
[  183.683148] Tainted: [W]=WARN
[  183.683208] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  183.683280] Workqueue: netns cleanup_net
[  183.683342] RIP: 0010:rtmsg_ifinfo_build_skb+0xc8/0x110
[  183.683410] 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
[  183.683533] RSP: 0018:ff6a9ac84023fc78 EFLAGS: 00010286
[  183.683601] RAX: 00000000ffffffa6 RBX: 00000000ffffffff RCX: 0000000000000000
[  183.683684] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff48218e81dec800
[  183.683775] RBP: 0000000000000000 R08: ff48218e8192cf10 R09: ff48218e878a102c
[  183.683853] R10: ff48218e84bc4118 R11: fefefefefefefeff R12: 0000000000000000
[  183.683931] R13: 0000000000000011 R14: ff48218e84bc4000 R15: ff48218e81dec800
[  183.684011] FS:  0000000000000000(0000) GS:ff48218f0c996000(0000) knlGS:0000000000000000
[  183.684087] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.684156] CR2: 000055f7f26102b8 CR3: 000000000398f005 CR4: 0000000000771ef0
[  183.684235] PKRU: 55555554
[  183.684285] Call Trace:
[  183.684337]  <TASK>
[  183.684386]  unregister_netdevice_many_notify+0x877/0x9d0
[  183.684452]  default_device_exit_batch+0x318/0x390
[  183.684521]  ops_undo_list+0x10b/0x240
[  183.684583]  cleanup_net+0x1d7/0x2e0
[  183.684644]  process_one_work+0x162/0x360
[  183.684711]  worker_thread+0x16e/0x2d0
[  183.684780]  ? rescuer_thread+0x510/0x510
[  183.684841]  kthread+0xe1/0x120
[  183.684908]  ? kthread_park+0xa0/0xa0
[  183.684968]  ret_from_fork+0x16d/0x250
[  183.685030]  ? kthread_park+0xa0/0xa0
[  183.685091]  ret_from_fork_asm+0x11/0x20
[  183.685153]  </TASK>
[  183.685203] ---[ end trace 0000000000000000 ]---