[   32.092362] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   32.092485] #PF: supervisor write access in kernel mode
[   32.092536] #PF: error_code(0x0002) - not-present page
[   32.092592] PGD 0 P4D 0 
[   32.092630] Oops: Oops: 0002 [#1] SMP
[   32.092680] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[   32.092793] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.092868] Workqueue: netns cleanup_net
[   32.092919] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   32.092989] 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
[   32.093191] RSP: 0018:ffffb53200067bb8 EFLAGS: 00010046
[   32.093244] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[   32.093327] RDX: ffffb53200067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[   32.093430] RBP: ffffb53200067bf0 R08: ffff891881393673 R09: 0000000000000002
[   32.093519] R10: ffff8918bec28840 R11: ffff891881392e90 R12: 0000000000000000
[   32.093603] R13: ffffb53200067ce8 R14: 0000000000000020 R15: ffffb53200067df0
[   32.093691] FS:  0000000000000000(0000) GS:ffff89190e5c1000(0000) knlGS:0000000000000000
[   32.093790] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.093859] CR2: 0000000000000000 CR3: 0000000004f3e002 CR4: 0000000000772ef0
[   32.093953] PKRU: 55555554
[   32.093979] Call Trace:
[   32.094013]  <TASK>
[   32.094039]  __cancel_work+0x29/0xe0
[   32.094088]  ? queue_delayed_work_on+0x54/0x60
[   32.094147]  __cancel_work_sync+0x16/0x80
[   32.094189]  __dev_close_many+0x11b/0x280
[   32.094236]  netif_close_many+0x98/0x160
[   32.094281]  unregister_netdevice_many_notify+0x1d8/0xa50
[   32.094344]  ? unregister_netdevice_queue+0x29/0xe0
[   32.094405]  default_device_exit_batch+0x29b/0x300
[   32.094464]  ops_undo_list+0xec/0x1f0
[   32.094505]  cleanup_net+0x1b7/0x2b0
[   32.094545]  process_one_work+0x162/0x380
[   32.094604]  worker_thread+0x299/0x3c0
[   32.094645]  ? rescuer_thread+0x4c0/0x4c0
[   32.094691]  kthread+0x101/0x1f0
[   32.094743]  ? kthreads_online_cpu+0x110/0x110
[   32.094805]  ? kthreads_online_cpu+0x110/0x110
[   32.094860]  ret_from_fork+0x11c/0x140
[   32.094916]  ? kthreads_online_cpu+0x110/0x110
[   32.094980]  ret_from_fork_asm+0x11/0x20
[   32.095029]  </TASK>
[   32.095065] Modules linked in: xt_mark nft_compat nf_tables
[   32.095123] CR2: 0000000000000000
[   32.095169] ---[ end trace 0000000000000000 ]---
[   32.095226] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   32.095283] 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
[   32.095491] RSP: 0018:ffffb53200067bb8 EFLAGS: 00010046
[   32.095550] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[   32.095633] RDX: ffffb53200067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[   32.095723] RBP: ffffb53200067bf0 R08: ffff891881393673 R09: 0000000000000002
[   32.095808] R10: ffff8918bec28840 R11: ffff891881392e90 R12: 0000000000000000
[   32.095902] R13: ffffb53200067ce8 R14: 0000000000000020 R15: ffffb53200067df0
[   32.095993] FS:  0000000000000000(0000) GS:ffff89190e5c1000(0000) knlGS:0000000000000000
[   32.096081] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.096159] CR2: 0000000000000000 CR3: 0000000004f3e002 CR4: 0000000000772ef0
[   32.096251] PKRU: 55555554
[   32.096281] note: kworker/u16:0[12] exited with irqs disabled