[   10.712434] mptcp_connect (1114) used greatest stack depth: 12520 bytes left
[   12.268504] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   12.268599] #PF: supervisor write access in kernel mode
[   12.268653] #PF: error_code(0x0002) - not-present page
[   12.268706] PGD 0 P4D 0 
[   12.268732] Oops: Oops: 0002 [#1] SMP
[   12.268772] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[   12.268870] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.268935] Workqueue: netns cleanup_net
[   12.268987] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   12.269047] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 <f0> 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41
[   12.269230] RSP: 0018:ffffacef40257bb8 EFLAGS: 00010046
[   12.269282] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   12.269360] RDX: ffffacef40257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[   12.269431] RBP: ffffacef40257bf0 R08: ffffffffaa4779b0 R09: 0000000000000101
[   12.269511] R10: ffffffffaac080d8 R11: ffffacef400e4ff8 R12: 0000000000000000
[   12.269582] R13: ffffacef40257ce8 R14: 0000000000000020 R15: ffffacef40257df0
[   12.269664] FS:  0000000000000000(0000) GS:ffff930f13841000(0000) knlGS:0000000000000000
[   12.269753] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.269815] CR2: 0000000000000000 CR3: 0000000016847002 CR4: 0000000000772ef0
[   12.269891] PKRU: 55555554
[   12.269913] Call Trace:
[   12.269939]  <TASK>
[   12.269973]  __cancel_work+0x29/0xe0
[   12.270019]  ? dev_deactivate_many+0x2c9/0x300
[   12.270093]  __cancel_work_sync+0x16/0x80
[   12.270133]  __dev_close_many+0x11b/0x280
[   12.270179]  netif_close_many+0x98/0x160
[   12.270215]  unregister_netdevice_many_notify+0x1d8/0xa50
[   12.270270]  default_device_exit_batch+0x29b/0x300
[   12.270333]  ops_undo_list+0xec/0x1f0
[   12.270380]  cleanup_net+0x1b7/0x2b0
[   12.270416]  process_one_work+0x162/0x380
[   12.270450]  worker_thread+0x299/0x3c0
[   12.270494]  ? rescuer_thread+0x4c0/0x4c0
[   12.270531]  kthread+0x101/0x1f0
[   12.270568]  ? kthreads_online_cpu+0x110/0x110
[   12.270623]  ? kthreads_online_cpu+0x110/0x110
[   12.270670]  ret_from_fork+0x11c/0x140
[   12.270715]  ? kthreads_online_cpu+0x110/0x110
[   12.270769]  ret_from_fork_asm+0x11/0x20
[   12.270814]  </TASK>
[   12.270838] Modules linked in: tcp_diag mptcp_diag inet_diag
[   12.270904] CR2: 0000000000000000
[   12.270946] ---[ end trace 0000000000000000 ]---
[   12.270994] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   12.271054] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 <f0> 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41
[   12.271228] RSP: 0018:ffffacef40257bb8 EFLAGS: 00010046
[   12.271289] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   12.271358] RDX: ffffacef40257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[   12.271436] RBP: ffffacef40257bf0 R08: ffffffffaa4779b0 R09: 0000000000000101
[   12.271516] R10: ffffffffaac080d8 R11: ffffacef400e4ff8 R12: 0000000000000000
[   12.271595] R13: ffffacef40257ce8 R14: 0000000000000020 R15: ffffacef40257df0
[   12.271667] FS:  0000000000000000(0000) GS:ffff930f13841000(0000) knlGS:0000000000000000
[   12.271749] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.271797] CR2: 0000000000000000 CR3: 0000000016847002 CR4: 0000000000772ef0
[   12.271851] PKRU: 55555554
[   12.271874] note: kworker/u16:1[67] exited with irqs disabled