[    2.767762] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.767845] #PF: supervisor write access in kernel mode
[    2.767885] #PF: error_code(0x0002) - not-present page
[    2.767925] PGD 7892067 P4D 7892067 PUD 7893067 PMD 0 
[    2.767976] Oops: Oops: 0002 [#1] SMP
[    2.768014] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.768086] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.768130] Workqueue: netns cleanup_net
[    2.768177] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.768223] 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
[    2.768341] RSP: 0018:ffffa4cc40067bb8 EFLAGS: 00010046
[    2.768381] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.768438] RDX: ffffa4cc40067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.768495] RBP: ffffa4cc40067bf0 R08: ffffffff9d4779b0 R09: 0000000000000101
[    2.768545] R10: ffffffff9dc080d8 R11: ffffa4cc40003ff8 R12: 0000000000000000
[    2.768603] R13: ffffa4cc40067ce8 R14: 0000000000000020 R15: ffffa4cc40067df0
[    2.768665] FS:  0000000000000000(0000) GS:ffff9233e07c1000(0000) knlGS:0000000000000000
[    2.768722] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.768781] CR2: 0000000000000000 CR3: 0000000007846006 CR4: 0000000000772ef0
[    2.768838] PKRU: 55555554
[    2.768860] Call Trace:
[    2.768883]  <TASK>
[    2.768910]  __cancel_work+0x29/0xe0
[    2.768944]  ? dev_deactivate_many+0x2c9/0x300
[    2.769002]  __cancel_work_sync+0x16/0x80
[    2.769030]  __dev_close_many+0x11b/0x280
[    2.769074]  netif_close_many+0x98/0x160
[    2.769107]  unregister_netdevice_many_notify+0x1d8/0xa50
[    2.769151]  default_device_exit_batch+0x29b/0x300
[    2.769191]  ops_undo_list+0xec/0x1f0
[    2.769227]  cleanup_net+0x1b7/0x2b0
[    2.769258]  process_one_work+0x162/0x380
[    2.769291]  worker_thread+0x299/0x3c0
[    2.769323]  ? rescuer_thread+0x4c0/0x4c0
[    2.769360]  kthread+0x101/0x1f0
[    2.769399]  ? kthreads_online_cpu+0x110/0x110
[    2.769437]  ? kthreads_online_cpu+0x110/0x110
[    2.769470]  ret_from_fork+0x11c/0x140
[    2.769508]  ? kthreads_online_cpu+0x110/0x110
[    2.769547]  ret_from_fork_asm+0x11/0x20
[    2.769585]  </TASK>
[    2.769607] Modules linked in:
[    2.769656] CR2: 0000000000000000
[    2.769687] ---[ end trace 0000000000000000 ]---
[    2.769726] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.769774] 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
[    2.769891] RSP: 0018:ffffa4cc40067bb8 EFLAGS: 00010046
[    2.769932] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.769995] RDX: ffffa4cc40067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.770050] RBP: ffffa4cc40067bf0 R08: ffffffff9d4779b0 R09: 0000000000000101
[    2.770097] R10: ffffffff9dc080d8 R11: ffffa4cc40003ff8 R12: 0000000000000000
[    2.770146] R13: ffffa4cc40067ce8 R14: 0000000000000020 R15: ffffa4cc40067df0
[    2.770196] FS:  0000000000000000(0000) GS:ffff9233e07c1000(0000) knlGS:0000000000000000
[    2.770255] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.770301] CR2: 0000000000000000 CR3: 0000000007846006 CR4: 0000000000772ef0
[    2.770352] PKRU: 55555554
[    2.770368] note: kworker/u16:0[12] exited with irqs disabled