[    5.298524] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    5.298616] #PF: supervisor write access in kernel mode
[    5.298668] #PF: error_code(0x0002) - not-present page
[    5.298714] PGD 0 P4D 0 
[    5.298744] Oops: Oops: 0002 [#1] SMP
[    5.298787] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    5.298879] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.298936] Workqueue: netns cleanup_net
[    5.298984] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    5.299043] 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
[    5.299213] RSP: 0000:ffffbe6a80257bb8 EFLAGS: 00010046
[    5.299259] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    5.299329] RDX: ffffbe6a80257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    5.299407] RBP: ffffbe6a80257bf0 R08: ffff97e14139b673 R09: 0000000000000002
[    5.299487] R10: ffff97e17ec28840 R11: ffff97e14139ae90 R12: 0000000000000000
[    5.299565] R13: ffffbe6a80257ce8 R14: 0000000000000020 R15: ffffbe6a80257df0
[    5.299646] FS:  0000000000000000(0000) GS:ffff97e1d0b91000(0000) knlGS:0000000000000000
[    5.299721] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.299786] CR2: 0000000000000000 CR3: 0000000003de0003 CR4: 0000000000772ef0
[    5.299856] PKRU: 55555554
[    5.299887] Call Trace:
[    5.299914]  <TASK>
[    5.299944]  __cancel_work+0x29/0xe0
[    5.299989]  ? queue_delayed_work_on+0x54/0x60
[    5.300043]  __cancel_work_sync+0x16/0x80
[    5.300085]  __dev_close_many+0x113/0x2b0
[    5.300128]  netif_close_many+0x98/0x160
[    5.300171]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    5.300225]  ? unregister_netdevice_queue+0x29/0xe0
[    5.300277]  default_device_exit_batch+0x29b/0x300
[    5.300332]  ? mutex_lock+0x12/0x30
[    5.300373]  ops_undo_list+0xec/0x1f0
[    5.300419]  cleanup_net+0x1b7/0x300
[    5.300460]  process_one_work+0x162/0x380
[    5.300501]  worker_thread+0x299/0x3c0
[    5.300544]  ? rescuer_thread+0x4c0/0x4c0
[    5.300589]  kthread+0x101/0x1f0
[    5.300624]  ? kthreads_online_cpu+0x110/0x110
[    5.300680]  ? kthreads_online_cpu+0x110/0x110
[    5.300737]  ret_from_fork+0x11c/0x140
[    5.300780]  ? kthreads_online_cpu+0x110/0x110
[    5.300833]  ret_from_fork_asm+0x11/0x20
[    5.300874]  </TASK>
[    5.300902] Modules linked in:
[    5.300940] CR2: 0000000000000000
[    5.300976] ---[ end trace 0000000000000000 ]---
[    5.301028] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    5.301080] 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
[    5.301253] RSP: 0000:ffffbe6a80257bb8 EFLAGS: 00010046
[    5.301301] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    5.301371] RDX: ffffbe6a80257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    5.301443] RBP: ffffbe6a80257bf0 R08: ffff97e14139b673 R09: 0000000000000002
[    5.301517] R10: ffff97e17ec28840 R11: ffff97e14139ae90 R12: 0000000000000000
[    5.301587] R13: ffffbe6a80257ce8 R14: 0000000000000020 R15: ffffbe6a80257df0
[    5.301659] FS:  0000000000000000(0000) GS:ffff97e1d0b91000(0000) knlGS:0000000000000000
[    5.301732] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.301795] CR2: 0000000000000000 CR3: 0000000003de0003 CR4: 0000000000772ef0
[    5.301876] PKRU: 55555554
[    5.301905] note: kworker/u16:1[67] exited with irqs disabled