[    2.008142] ip (252) used greatest stack depth: 12168 bytes left
[    4.413186] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    4.413257] #PF: supervisor write access in kernel mode
[    4.413307] #PF: error_code(0x0002) - not-present page
[    4.413351] PGD 3286067 P4D 3286067 PUD 3289067 PMD 0 
[    4.413392] Oops: Oops: 0002 [#1] SMP
[    4.413419] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    4.413495] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.413540] Workqueue: netns cleanup_net
[    4.413580] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.413629] 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
[    4.413778] RSP: 0000:ffffae5140257bb8 EFLAGS: 00010046
[    4.413814] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    4.413867] RDX: ffffae5140257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.413919] RBP: ffffae5140257bf0 R08: ffff9bcac139b673 R09: 0000000000000002
[    4.413979] R10: ffff9bcafec28840 R11: ffff9bcac139ae90 R12: 0000000000000000
[    4.414038] R13: ffffae5140257ce8 R14: 0000000000000020 R15: ffffae5140257df0
[    4.414094] FS:  0000000000000000(0000) GS:ffff9bcb6c591000(0000) knlGS:0000000000000000
[    4.414152] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.414195] CR2: 0000000000000000 CR3: 000000000673b004 CR4: 0000000000772ef0
[    4.414247] PKRU: 55555554
[    4.414264] Call Trace:
[    4.414283]  <TASK>
[    4.414318]  __cancel_work+0x29/0xe0
[    4.414351]  ? queue_delayed_work_on+0x54/0x60
[    4.414394]  __cancel_work_sync+0x16/0x80
[    4.414426]  __dev_close_many+0x113/0x2b0
[    4.414461]  netif_close_many+0x98/0x160
[    4.414502]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    4.414542]  ? unregister_netdevice_queue+0x29/0xe0
[    4.414578]  default_device_exit_batch+0x29b/0x300
[    4.414621]  ? mutex_lock+0x12/0x30
[    4.414662]  ops_undo_list+0xec/0x1f0
[    4.414699]  cleanup_net+0x1b7/0x300
[    4.414730]  process_one_work+0x162/0x380
[    4.414773]  worker_thread+0x299/0x3c0
[    4.414803]  ? rescuer_thread+0x4c0/0x4c0
[    4.414835]  kthread+0x101/0x1f0
[    4.414863]  ? kthreads_online_cpu+0x110/0x110
[    4.414904]  ? kthreads_online_cpu+0x110/0x110
[    4.414944]  ret_from_fork+0x11c/0x140
[    4.414975]  ? kthreads_online_cpu+0x110/0x110
[    4.415024]  ret_from_fork_asm+0x11/0x20
[    4.415059]  </TASK>
[    4.415080] Modules linked in: sch_etf sch_fq
[    4.415130] CR2: 0000000000000000
[    4.415162] ---[ end trace 0000000000000000 ]---
[    4.415196] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.415235] 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
[    4.415360] RSP: 0000:ffffae5140257bb8 EFLAGS: 00010046
[    4.415396] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    4.415449] RDX: ffffae5140257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.415510] RBP: ffffae5140257bf0 R08: ffff9bcac139b673 R09: 0000000000000002
[    4.415562] R10: ffff9bcafec28840 R11: ffff9bcac139ae90 R12: 0000000000000000
[    4.415615] R13: ffffae5140257ce8 R14: 0000000000000020 R15: ffffae5140257df0
[    4.415678] FS:  0000000000000000(0000) GS:ffff9bcb6c591000(0000) knlGS:0000000000000000
[    4.415731] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.415791] CR2: 0000000000000000 CR3: 000000000673b004 CR4: 0000000000772ef0
[    4.415847] PKRU: 55555554
[    4.415870] note: kworker/u16:1[67] exited with irqs disabled