[    2.592020] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.592101] #PF: supervisor write access in kernel mode
[    2.592146] #PF: error_code(0x0002) - not-present page
[    2.592183] PGD 7035067 P4D 7035067 PUD 6398067 PMD 0 
[    2.592230] Oops: Oops: 0002 [#1] SMP
[    2.592260] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.592332] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.592386] Workqueue: netns cleanup_net
[    2.592422] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.592473] 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
[    2.592618] RSP: 0018:ffffb95800067bb8 EFLAGS: 00010046
[    2.592658] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.592715] RDX: ffffb95800067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.592774] RBP: ffffb95800067bf0 R08: ffffffff86c779b0 R09: 0000000000000101
[    2.592833] R10: ffffffff874080d8 R11: ffffb95800003ff8 R12: 0000000000000000
[    2.592894] R13: ffffb95800067ce8 R14: 0000000000000020 R15: ffffb95800067df0
[    2.592960] FS:  0000000000000000(0000) GS:ffff9ba5f6fc1000(0000) knlGS:0000000000000000
[    2.593030] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.593086] CR2: 0000000000000000 CR3: 000000000639f006 CR4: 0000000000772ef0
[    2.593151] PKRU: 55555554
[    2.593171] Call Trace:
[    2.593192]  <TASK>
[    2.593219]  __cancel_work+0x29/0xe0
[    2.593257]  ? dev_deactivate_many+0x2c9/0x300
[    2.593302]  __cancel_work_sync+0x16/0x80
[    2.593337]  __dev_close_many+0x11b/0x280
[    2.593374]  netif_close_many+0x98/0x160
[    2.593409]  unregister_netdevice_many_notify+0x1d8/0xa50
[    2.593455]  default_device_exit_batch+0x29b/0x300
[    2.593502]  ops_undo_list+0xec/0x1f0
[    2.593537]  cleanup_net+0x1b7/0x2b0
[    2.593573]  process_one_work+0x162/0x380
[    2.593610]  worker_thread+0x299/0x3c0
[    2.593653]  ? rescuer_thread+0x4c0/0x4c0
[    2.593688]  kthread+0x101/0x1f0
[    2.593724]  ? kthreads_online_cpu+0x110/0x110
[    2.593768]  ? kthreads_online_cpu+0x110/0x110
[    2.593819]  ret_from_fork+0x11c/0x140
[    2.593856]  ? kthreads_online_cpu+0x110/0x110
[    2.593901]  ret_from_fork_asm+0x11/0x20
[    2.593936]  </TASK>
[    2.593962] Modules linked in:
[    2.593992] CR2: 0000000000000000
[    2.594024] ---[ end trace 0000000000000000 ]---
[    2.594067] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.594112] 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
[    2.594247] RSP: 0018:ffffb95800067bb8 EFLAGS: 00010046
[    2.594285] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.594342] RDX: ffffb95800067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.594408] RBP: ffffb95800067bf0 R08: ffffffff86c779b0 R09: 0000000000000101
[    2.594473] R10: ffffffff874080d8 R11: ffffb95800003ff8 R12: 0000000000000000
[    2.594529] R13: ffffb95800067ce8 R14: 0000000000000020 R15: ffffb95800067df0
[    2.594596] FS:  0000000000000000(0000) GS:ffff9ba5f6fc1000(0000) knlGS:0000000000000000
[    2.594661] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.594713] CR2: 0000000000000000 CR3: 000000000639f006 CR4: 0000000000772ef0
[    2.594772] PKRU: 55555554
[    2.594792] note: kworker/u16:0[12] exited with irqs disabled