[    2.883400] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.883472] #PF: supervisor write access in kernel mode
[    2.883509] #PF: error_code(0x0002) - not-present page
[    2.883563] PGD 0 P4D 0 
[    2.883587] Oops: Oops: 0002 [#1] SMP
[    2.883620] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.883702] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.883762] Workqueue: netns cleanup_net
[    2.883816] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.883872] 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
[    2.884000] RSP: 0018:ffffb2244024fbb8 EFLAGS: 00010046
[    2.884052] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.884104] RDX: ffffb2244024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.884164] RBP: ffffb2244024fbf0 R08: ffffffff942779b0 R09: 0000000000000101
[    2.884227] R10: ffffffff94a080d8 R11: ffffb2244013cff8 R12: 0000000000000000
[    2.884296] R13: ffffb2244024fce8 R14: 0000000000000020 R15: ffffb2244024fdf0
[    2.884369] FS:  0000000000000000(0000) GS:ffff8e0e29b41000(0000) knlGS:0000000000000000
[    2.884436] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.884483] CR2: 0000000000000000 CR3: 000000002d647005 CR4: 0000000000772ef0
[    2.884538] PKRU: 55555554
[    2.884567] Call Trace:
[    2.884590]  <TASK>
[    2.884614]  __cancel_work+0x29/0xe0
[    2.884646]  ? dev_deactivate_many+0x2c9/0x300
[    2.884698]  __cancel_work_sync+0x16/0x80
[    2.884726]  __dev_close_many+0x11b/0x280
[    2.884762]  netif_close_many+0x98/0x160
[    2.884800]  ? rcu_barrier_entrain+0xb0/0xb0
[    2.884850]  unregister_netdevice_many_notify+0x1d8/0xa50
[    2.884915]  default_device_exit_batch+0x29b/0x300
[    2.884965]  ops_undo_list+0xec/0x1f0
[    2.885001]  cleanup_net+0x1b7/0x2b0
[    2.885042]  process_one_work+0x162/0x380
[    2.885075]  worker_thread+0x299/0x3c0
[    2.885108]  ? rescuer_thread+0x4c0/0x4c0
[    2.885140]  kthread+0x101/0x1f0
[    2.885174]  ? kthreads_online_cpu+0x110/0x110
[    2.885213]  ? kthreads_online_cpu+0x110/0x110
[    2.885255]  ret_from_fork+0x11c/0x140
[    2.885297]  ? kthreads_online_cpu+0x110/0x110
[    2.885337]  ret_from_fork_asm+0x11/0x20
[    2.885382]  </TASK>
[    2.885405] Modules linked in:
[    2.885450] CR2: 0000000000000000
[    2.885497] ---[ end trace 0000000000000000 ]---
[    2.885538] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.885574] 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
[    2.885702] RSP: 0018:ffffb2244024fbb8 EFLAGS: 00010046
[    2.885740] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.885792] RDX: ffffb2244024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.885854] RBP: ffffb2244024fbf0 R08: ffffffff942779b0 R09: 0000000000000101
[    2.885917] R10: ffffffff94a080d8 R11: ffffb2244013cff8 R12: 0000000000000000
[    2.885972] R13: ffffb2244024fce8 R14: 0000000000000020 R15: ffffb2244024fdf0
[    2.886036] FS:  0000000000000000(0000) GS:ffff8e0e29b41000(0000) knlGS:0000000000000000
[    2.886112] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.886171] CR2: 0000000000000000 CR3: 000000002d647005 CR4: 0000000000772ef0
[    2.886232] PKRU: 55555554
[    2.886255] note: kworker/u16:1[66] exited with irqs disabled