[    2.993369] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.993454] #PF: supervisor write access in kernel mode
[    2.993505] #PF: error_code(0x0002) - not-present page
[    2.993538] PGD 0 P4D 0 
[    2.993563] Oops: Oops: 0002 [#1] SMP
[    2.993610] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.993707] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.993760] Workqueue: netns cleanup_net
[    2.993805] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.993859] 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
[    2.993995] RSP: 0018:ffffab2700257bb8 EFLAGS: 00010046
[    2.994041] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.994102] RDX: ffffab2700257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.994165] RBP: ffffab2700257bf0 R08: ffffffff878779b0 R09: 0000000000000101
[    2.994233] R10: ffffffff880080d8 R11: ffffab2700003ff8 R12: 0000000000000000
[    2.994303] R13: ffffab2700257ce8 R14: 0000000000000020 R15: ffffab2700257df0
[    2.994368] FS:  0000000000000000(0000) GS:ffff91e7363c1000(0000) knlGS:0000000000000000
[    2.994432] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.994477] CR2: 0000000000000000 CR3: 0000000007087001 CR4: 0000000000772ef0
[    2.994544] PKRU: 55555554
[    2.994567] Call Trace:
[    2.994590]  <TASK>
[    2.994619]  __cancel_work+0x29/0xe0
[    2.994656]  ? dev_deactivate_many+0x2c9/0x300
[    2.994714]  __cancel_work_sync+0x16/0x80
[    2.994748]  __dev_close_many+0x11b/0x280
[    2.994790]  netif_close_many+0x98/0x160
[    2.994826]  unregister_netdevice_many_notify+0x1d8/0xa50
[    2.994876]  default_device_exit_batch+0x29b/0x300
[    2.994924]  ops_undo_list+0xec/0x1f0
[    2.994962]  cleanup_net+0x1b7/0x2b0
[    2.994998]  process_one_work+0x162/0x380
[    2.995034]  worker_thread+0x299/0x3c0
[    2.995066]  ? rescuer_thread+0x4c0/0x4c0
[    2.995101]  kthread+0x101/0x1f0
[    2.995147]  ? kthreads_online_cpu+0x110/0x110
[    2.995192]  ? kthreads_online_cpu+0x110/0x110
[    2.995235]  ret_from_fork+0x11c/0x140
[    2.995278]  ? kthreads_online_cpu+0x110/0x110
[    2.995320]  ret_from_fork_asm+0x11/0x20
[    2.995366]  </TASK>
[    2.995388] Modules linked in:
[    2.995417] CR2: 0000000000000000
[    2.995457] ---[ end trace 0000000000000000 ]---
[    2.995505] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.995551] 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
[    2.995683] RSP: 0018:ffffab2700257bb8 EFLAGS: 00010046
[    2.995721] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.995782] RDX: ffffab2700257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.995838] RBP: ffffab2700257bf0 R08: ffffffff878779b0 R09: 0000000000000101
[    2.995901] R10: ffffffff880080d8 R11: ffffab2700003ff8 R12: 0000000000000000
[    2.995956] R13: ffffab2700257ce8 R14: 0000000000000020 R15: ffffab2700257df0
[    2.996014] FS:  0000000000000000(0000) GS:ffff91e7363c1000(0000) knlGS:0000000000000000
[    2.996076] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.996127] CR2: 0000000000000000 CR3: 0000000007087001 CR4: 0000000000772ef0
[    2.996190] PKRU: 55555554
[    2.996212] note: kworker/u16:1[67] exited with irqs disabled