[    2.124489] ip (258) used greatest stack depth: 12136 bytes left
[    2.925664] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.925750] #PF: supervisor write access in kernel mode
[    2.925798] #PF: error_code(0x0002) - not-present page
[    2.925845] PGD 0 P4D 0 
[    2.925874] Oops: Oops: 0002 [#1] SMP
[    2.925917] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.925998] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.926046] Workqueue: netns cleanup_net
[    2.926105] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.926162] 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
[    2.926307] RSP: 0018:ffffac7680067bb8 EFLAGS: 00010046
[    2.926351] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000000000a
[    2.926413] RDX: ffffac7680067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.926474] RBP: ffffac7680067bf0 R08: 0000000000000000 R09: ffffffffc0400100
[    2.926537] R10: ffff8b7d83c7f400 R11: 0000000000000001 R12: 0000000000000000
[    2.926598] R13: ffffac7680067ce8 R14: 0000000000000020 R15: ffffac7680067df0
[    2.926662] FS:  0000000000000000(0000) GS:ffff8b7e23d91000(0000) knlGS:0000000000000000
[    2.926737] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.926794] CR2: 0000000000000000 CR3: 0000000002fdd001 CR4: 0000000000772ef0
[    2.926864] PKRU: 55555554
[    2.926887] Call Trace:
[    2.926914]  <TASK>
[    2.926942]  __cancel_work+0x29/0xe0
[    2.926993]  ? dev_deactivate_many+0x2c9/0x300
[    2.927045]  __cancel_work_sync+0x16/0x80
[    2.927085]  __dev_close_many+0x113/0x2b0
[    2.927126]  netif_close_many+0x98/0x160
[    2.927161]  unregister_netdevice_many_notify+0x10c/0xaa0
[    2.927208]  default_device_exit_batch+0x29b/0x300
[    2.927252]  ? mutex_lock+0x12/0x30
[    2.927296]  ops_undo_list+0xec/0x1f0
[    2.927334]  cleanup_net+0x1b7/0x300
[    2.927368]  process_one_work+0x162/0x380
[    2.927405]  worker_thread+0x299/0x3c0
[    2.927448]  ? rescuer_thread+0x4c0/0x4c0
[    2.927487]  kthread+0x101/0x1f0
[    2.927527]  ? kthreads_online_cpu+0x110/0x110
[    2.927573]  ? kthreads_online_cpu+0x110/0x110
[    2.927618]  ret_from_fork+0x11c/0x140
[    2.927662]  ? kthreads_online_cpu+0x110/0x110
[    2.927705]  ret_from_fork_asm+0x11/0x20
[    2.927750]  </TASK>
[    2.927773] Modules linked in: sch_fq
[    2.927811] CR2: 0000000000000000
[    2.927848] ---[ end trace 0000000000000000 ]---
[    2.927892] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.927951] 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
[    2.928102] RSP: 0018:ffffac7680067bb8 EFLAGS: 00010046
[    2.928145] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000000000a
[    2.928205] RDX: ffffac7680067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.928266] RBP: ffffac7680067bf0 R08: 0000000000000000 R09: ffffffffc0400100
[    2.928329] R10: ffff8b7d83c7f400 R11: 0000000000000001 R12: 0000000000000000
[    2.928391] R13: ffffac7680067ce8 R14: 0000000000000020 R15: ffffac7680067df0
[    2.928454] FS:  0000000000000000(0000) GS:ffff8b7e23d91000(0000) knlGS:0000000000000000
[    2.928521] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.928576] CR2: 0000000000000000 CR3: 0000000002fdd001 CR4: 0000000000772ef0
[    2.928642] PKRU: 55555554
[    2.928665] note: kworker/u16:0[12] exited with irqs disabled