[    2.736946] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.737060] #PF: supervisor write access in kernel mode
[    2.737129] #PF: error_code(0x0002) - not-present page
[    2.737190] PGD 0 P4D 0 
[    2.737222] Oops: Oops: 0002 [#1] SMP
[    2.737279] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.737373] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.737442] Workqueue: netns cleanup_net
[    2.737508] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.737588] 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
[    2.737782] RSP: 0018:ffffb8d48024fbb8 EFLAGS: 00010046
[    2.737856] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.737951] RDX: ffffb8d48024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.738042] RBP: ffffb8d48024fbf0 R08: ffffffff8ce93e00 R09: 0000000000000101
[    2.738114] R10: ffffffff8da080d8 R11: ffffb8d480003ff8 R12: 0000000000000000
[    2.738208] R13: ffffb8d48024fce8 R14: 0000000000000020 R15: ffffb8d48024fdf0
[    2.738299] FS:  0000000000000000(0000) GS:ffff89de70991000(0000) knlGS:0000000000000000
[    2.738385] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.738456] CR2: 0000000000000000 CR3: 00000000063c5001 CR4: 0000000000772ef0
[    2.738538] PKRU: 55555554
[    2.738586] Call Trace:
[    2.738628]  <TASK>
[    2.738672]  __cancel_work+0x29/0xe0
[    2.738726]  ? dev_deactivate_many+0x2c9/0x300
[    2.738794]  __cancel_work_sync+0x16/0x80
[    2.738836]  __dev_close_many+0x113/0x2b0
[    2.738888]  netif_close_many+0x98/0x160
[    2.738939]  unregister_netdevice_many_notify+0x10c/0xaa0
[    2.739001]  default_device_exit_batch+0x29b/0x300
[    2.739056]  ? mutex_lock+0x12/0x30
[    2.739124]  ops_undo_list+0xec/0x1f0
[    2.739178]  cleanup_net+0x1b7/0x300
[    2.739239]  process_one_work+0x162/0x380
[    2.739293]  worker_thread+0x299/0x3c0
[    2.739350]  ? rescuer_thread+0x4c0/0x4c0
[    2.739399]  kthread+0x101/0x1f0
[    2.739460]  ? kthreads_online_cpu+0x110/0x110
[    2.739518]  ? kthreads_online_cpu+0x110/0x110
[    2.739602]  ret_from_fork+0x11c/0x140
[    2.739664]  ? kthreads_online_cpu+0x110/0x110
[    2.739724]  ret_from_fork_asm+0x11/0x20
[    2.739777]  </TASK>
[    2.739805] Modules linked in:
[    2.739858] CR2: 0000000000000000
[    2.739913] ---[ end trace 0000000000000000 ]---
[    2.739978] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.740036] 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
[    2.740251] RSP: 0018:ffffb8d48024fbb8 EFLAGS: 00010046
[    2.740313] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.740396] RDX: ffffb8d48024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.740485] RBP: ffffb8d48024fbf0 R08: ffffffff8ce93e00 R09: 0000000000000101
[    2.740563] R10: ffffffff8da080d8 R11: ffffb8d480003ff8 R12: 0000000000000000
[    2.740654] R13: ffffb8d48024fce8 R14: 0000000000000020 R15: ffffb8d48024fdf0
[    2.740735] FS:  0000000000000000(0000) GS:ffff89de70991000(0000) knlGS:0000000000000000
[    2.740821] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.740887] CR2: 0000000000000000 CR3: 00000000063c5001 CR4: 0000000000772ef0
[    2.740975] PKRU: 55555554
[    2.741015] note: kworker/u16:1[66] exited with irqs disabled