[    2.933300] ip (318) used greatest stack depth: 12088 bytes left
[    3.098229] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    3.098327] #PF: supervisor write access in kernel mode
[    3.098377] #PF: error_code(0x0002) - not-present page
[    3.098416] PGD 0 P4D 0 
[    3.098445] Oops: Oops: 0002 [#1] SMP
[    3.098493] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    3.098571] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.098629] Workqueue: netns cleanup_net
[    3.098682] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.098738] 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
[    3.098888] RSP: 0018:ffffbcd840067bb8 EFLAGS: 00010046
[    3.098929] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.099007] RDX: ffffbcd840067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.099083] RBP: ffffbcd840067bf0 R08: ffffffffaa4779b0 R09: 0000000000000101
[    3.099144] R10: ffffffffaac080d8 R11: ffffbcd840110ff8 R12: 0000000000000000
[    3.099212] R13: ffffbcd840067ce8 R14: 0000000000000020 R15: ffffbcd840067df0
[    3.099291] FS:  0000000000000000(0000) GS:ffff98eb538c1000(0000) knlGS:0000000000000000
[    3.099366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.099414] CR2: 0000000000000000 CR3: 000000000c847006 CR4: 0000000000772ef0
[    3.099472] PKRU: 55555554
[    3.099500] Call Trace:
[    3.099526]  <TASK>
[    3.099551]  __cancel_work+0x29/0xe0
[    3.099590]  ? dev_deactivate_many+0x2c9/0x300
[    3.099648]  __cancel_work_sync+0x16/0x80
[    3.099690]  __dev_close_many+0x11b/0x280
[    3.099736]  netif_close_many+0x98/0x160
[    3.099771]  unregister_netdevice_many_notify+0x1d8/0xa50
[    3.099817]  default_device_exit_batch+0x29b/0x300
[    3.099864]  ops_undo_list+0xec/0x1f0
[    3.099899]  cleanup_net+0x1b7/0x2b0
[    3.099935]  process_one_work+0x162/0x380
[    3.099976]  worker_thread+0x299/0x3c0
[    3.100024]  ? rescuer_thread+0x4c0/0x4c0
[    3.100064]  kthread+0x101/0x1f0
[    3.100103]  ? kthreads_online_cpu+0x110/0x110
[    3.100161]  ? kthreads_online_cpu+0x110/0x110
[    3.100202]  ret_from_fork+0x11c/0x140
[    3.100243]  ? kthreads_online_cpu+0x110/0x110
[    3.100294]  ret_from_fork_asm+0x11/0x20
[    3.100339]  </TASK>
[    3.100361] Modules linked in:
[    3.100400] CR2: 0000000000000000
[    3.100436] ---[ end trace 0000000000000000 ]---
[    3.100485] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.100541] 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
[    3.100694] RSP: 0018:ffffbcd840067bb8 EFLAGS: 00010046
[    3.100745] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.100810] RDX: ffffbcd840067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.100870] RBP: ffffbcd840067bf0 R08: ffffffffaa4779b0 R09: 0000000000000101
[    3.100937] R10: ffffffffaac080d8 R11: ffffbcd840110ff8 R12: 0000000000000000
[    3.100995] R13: ffffbcd840067ce8 R14: 0000000000000020 R15: ffffbcd840067df0
[    3.101056] FS:  0000000000000000(0000) GS:ffff98eb538c1000(0000) knlGS:0000000000000000
[    3.101120] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.101181] CR2: 0000000000000000 CR3: 000000000c847006 CR4: 0000000000772ef0
[    3.101246] PKRU: 55555554
[    3.101279] note: kworker/u16:0[12] exited with irqs disabled