[    2.452868] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.452944] #PF: supervisor write access in kernel mode
[    2.452984] #PF: error_code(0x0002) - not-present page
[    2.453023] PGD 0 P4D 0 
[    2.453046] Oops: Oops: 0002 [#1] SMP
[    2.453078] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.453140] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.453185] Workqueue: netns cleanup_net
[    2.453224] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.453267] 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
[    2.453389] RSP: 0018:ffffa0e28024fbb8 EFLAGS: 00010046
[    2.453422] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000010000a
[    2.453473] RDX: ffffa0e28024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.453523] RBP: ffffa0e28024fbf0 R08: 0000000000000000 R09: ffffffff81f56300
[    2.453578] R10: ffff8a0a84fd7800 R11: 0000000000000001 R12: 0000000000000000
[    2.453628] R13: ffffa0e28024fce8 R14: 0000000000000020 R15: ffffa0e28024fdf0
[    2.453686] FS:  0000000000000000(0000) GS:ffff8a0b3b791000(0000) knlGS:0000000000000000
[    2.453742] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.453794] CR2: 0000000000000000 CR3: 0000000004e60006 CR4: 0000000000772ef0
[    2.453845] PKRU: 55555554
[    2.453866] Call Trace:
[    2.453884]  <TASK>
[    2.453906]  __cancel_work+0x29/0xe0
[    2.453936]  __cancel_work_sync+0x16/0x80
[    2.453980]  __dev_close_many+0x113/0x2b0
[    2.454017]  netif_close_many+0x98/0x160
[    2.454047]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.454086]  ? unregister_netdevice_queue+0x29/0xe0
[    2.454119]  default_device_exit_batch+0x29b/0x300
[    2.454152]  ? mutex_lock+0x12/0x30
[    2.454188]  ops_undo_list+0xec/0x1f0
[    2.454219]  cleanup_net+0x1b7/0x300
[    2.454248]  process_one_work+0x162/0x380
[    2.454278]  worker_thread+0x299/0x3c0
[    2.454309]  ? rescuer_thread+0x4c0/0x4c0
[    2.454339]  kthread+0x101/0x1f0
[    2.454370]  ? kthreads_online_cpu+0x110/0x110
[    2.454403]  ? kthreads_online_cpu+0x110/0x110
[    2.454437]  ret_from_fork+0x11c/0x140
[    2.454468]  ? kthreads_online_cpu+0x110/0x110
[    2.454520]  ret_from_fork_asm+0x11/0x20
[    2.454557]  </TASK>
[    2.454572] Modules linked in:
[    2.454598] CR2: 0000000000000000
[    2.454628] ---[ end trace 0000000000000000 ]---
[    2.454661] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.454700] 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
[    2.454820] RSP: 0018:ffffa0e28024fbb8 EFLAGS: 00010046
[    2.454853] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000010000a
[    2.454903] RDX: ffffa0e28024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.454955] RBP: ffffa0e28024fbf0 R08: 0000000000000000 R09: ffffffff81f56300
[    2.455010] R10: ffff8a0a84fd7800 R11: 0000000000000001 R12: 0000000000000000
[    2.455062] R13: ffffa0e28024fce8 R14: 0000000000000020 R15: ffffa0e28024fdf0
[    2.455118] FS:  0000000000000000(0000) GS:ffff8a0b3b791000(0000) knlGS:0000000000000000
[    2.455173] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.455220] CR2: 0000000000000000 CR3: 0000000004e60006 CR4: 0000000000772ef0
[    2.455271] PKRU: 55555554
[    2.455291] note: kworker/u16:1[66] exited with irqs disabled

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