[   12.489315] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   12.489414] #PF: supervisor write access in kernel mode
[   12.489467] #PF: error_code(0x0002) - not-present page
[   12.489507] PGD b0e6067 P4D b0e6067 PUD b0e7067 PMD 0 
[   12.489564] Oops: Oops: 0002 [#1] SMP
[   12.489615] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[   12.489700] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.489752] Workqueue: netns cleanup_net
[   12.489810] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   12.489876] 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
[   12.490044] RSP: 0018:ffffbfeac024fbb8 EFLAGS: 00010046
[   12.490101] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   12.490165] RDX: ffffbfeac024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[   12.490232] RBP: ffffbfeac024fbf0 R08: ffffffffb64779b0 R09: 0000000000000101
[   12.490302] R10: ffffffffb6c080d8 R11: ffffbfeac0003ff8 R12: 0000000000000000
[   12.490366] R13: ffffbfeac024fce8 R14: 0000000000000020 R15: ffffbfeac024fdf0
[   12.490432] FS:  0000000000000000(0000) GS:ffff9896c77c1000(0000) knlGS:0000000000000000
[   12.490520] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.490589] CR2: 0000000000000000 CR3: 00000000033b8001 CR4: 0000000000772ef0
[   12.490662] PKRU: 55555554
[   12.490683] Call Trace:
[   12.490716]  <TASK>
[   12.490751]  __cancel_work+0x29/0xe0
[   12.490801]  ? dev_deactivate_many+0x2c9/0x300
[   12.490868]  __cancel_work_sync+0x16/0x80
[   12.490906]  __dev_close_many+0x11b/0x280
[   12.490961]  netif_close_many+0x98/0x160
[   12.491000]  unregister_netdevice_many_notify+0x1d8/0xa50
[   12.491060]  default_device_exit_batch+0x29b/0x300
[   12.491116]  ops_undo_list+0xec/0x1f0
[   12.491150]  cleanup_net+0x1b7/0x2b0
[   12.491194]  process_one_work+0x162/0x380
[   12.491234]  worker_thread+0x299/0x3c0
[   12.491278]  ? rescuer_thread+0x4c0/0x4c0
[   12.491314]  kthread+0x101/0x1f0
[   12.491353]  ? kthreads_online_cpu+0x110/0x110
[   12.491408]  ? kthreads_online_cpu+0x110/0x110
[   12.491454]  ret_from_fork+0x11c/0x140
[   12.491501]  ? kthreads_online_cpu+0x110/0x110
[   12.491553]  ret_from_fork_asm+0x11/0x20
[   12.491608]  </TASK>
[   12.491635] Modules linked in:
[   12.491688] CR2: 0000000000000000
[   12.491727] ---[ end trace 0000000000000000 ]---
[   12.491776] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   12.491830] 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
[   12.492006] RSP: 0018:ffffbfeac024fbb8 EFLAGS: 00010046
[   12.492061] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   12.492133] RDX: ffffbfeac024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[   12.492198] RBP: ffffbfeac024fbf0 R08: ffffffffb64779b0 R09: 0000000000000101
[   12.492273] R10: ffffffffb6c080d8 R11: ffffbfeac0003ff8 R12: 0000000000000000
[   12.492333] R13: ffffbfeac024fce8 R14: 0000000000000020 R15: ffffbfeac024fdf0
[   12.492408] FS:  0000000000000000(0000) GS:ffff9896c77c1000(0000) knlGS:0000000000000000
[   12.492483] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.492541] CR2: 0000000000000000 CR3: 00000000033b8001 CR4: 0000000000772ef0
[   12.492622] PKRU: 55555554
[   12.492649] note: kworker/u16:1[66] exited with irqs disabled