[    1.871709] ip (253) used greatest stack depth: 12136 bytes left
[    3.491746] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    3.491826] #PF: supervisor write access in kernel mode
[    3.491875] #PF: error_code(0x0002) - not-present page
[    3.491918] PGD 0 P4D 0 
[    3.491946] Oops: Oops: 0002 [#1] SMP
[    3.491986] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    3.492069] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.492125] Workqueue: netns cleanup_net
[    3.492170] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.492231] 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
[    3.492396] RSP: 0018:ffffb51b80257bb8 EFLAGS: 00010046
[    3.492440] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.492513] RDX: ffffb51b80257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.492578] RBP: ffffb51b80257bf0 R08: 0000000000000000 R09: 0000000000000101
[    3.492644] R10: ffffffffa3208110 R11: 0000000000000031 R12: 0000000000000000
[    3.492711] R13: ffffb51b80257ce8 R14: 0000000000000020 R15: ffffb51b80257df0
[    3.492780] FS:  0000000000000000(0000) GS:ffff91fb5b191000(0000) knlGS:0000000000000000
[    3.492852] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.492912] CR2: 0000000000000000 CR3: 0000000003fc6005 CR4: 0000000000772ef0
[    3.492981] PKRU: 55555554
[    3.493008] Call Trace:
[    3.493031]  <TASK>
[    3.493055]  __cancel_work+0x29/0xe0
[    3.493097]  ? dev_deactivate_many+0x2c9/0x300
[    3.493154]  __cancel_work_sync+0x16/0x80
[    3.493192]  __dev_close_many+0x113/0x2b0
[    3.493234]  netif_close_many+0x98/0x160
[    3.493272]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    3.493316]  default_device_exit_batch+0x29b/0x300
[    3.493360]  ? mutex_lock+0x12/0x30
[    3.493406]  ops_undo_list+0xec/0x1f0
[    3.493445]  cleanup_net+0x1b7/0x300
[    3.493484]  process_one_work+0x162/0x380
[    3.493523]  worker_thread+0x299/0x3c0
[    3.493555]  ? rescuer_thread+0x4c0/0x4c0
[    3.493592]  kthread+0x101/0x1f0
[    3.493633]  ? kthreads_online_cpu+0x110/0x110
[    3.493681]  ? kthreads_online_cpu+0x110/0x110
[    3.493732]  ret_from_fork+0x11c/0x140
[    3.493772]  ? kthreads_online_cpu+0x110/0x110
[    3.493822]  ret_from_fork_asm+0x11/0x20
[    3.493862]  </TASK>
[    3.493884] Modules linked in:
[    3.493919] CR2: 0000000000000000
[    3.493957] ---[ end trace 0000000000000000 ]---
[    3.494002] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.494048] 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
[    3.494204] RSP: 0018:ffffb51b80257bb8 EFLAGS: 00010046
[    3.494253] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.494319] RDX: ffffb51b80257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.494387] RBP: ffffb51b80257bf0 R08: 0000000000000000 R09: 0000000000000101
[    3.494454] R10: ffffffffa3208110 R11: 0000000000000031 R12: 0000000000000000
[    3.494521] R13: ffffb51b80257ce8 R14: 0000000000000020 R15: ffffb51b80257df0
[    3.494591] FS:  0000000000000000(0000) GS:ffff91fb5b191000(0000) knlGS:0000000000000000
[    3.494661] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.494717] CR2: 0000000000000000 CR3: 0000000003fc6005 CR4: 0000000000772ef0
[    3.494787] PKRU: 55555554
[    3.494808] note: kworker/u16:1[67] exited with irqs disabled