[   38.288204] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   38.288307] #PF: supervisor write access in kernel mode
[   38.288349] #PF: error_code(0x0002) - not-present page
[   38.288388] PGD 0 P4D 0 
[   38.288421] Oops: Oops: 0002 [#1] SMP
[   38.288469] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[   38.288548] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.288616] Workqueue: netns cleanup_net
[   38.288678] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   38.288733] 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
[   38.288877] RSP: 0018:ffffac448025fbb8 EFLAGS: 00010046
[   38.288918] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   38.288990] RDX: ffffac448025fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[   38.289048] RBP: ffffac448025fbf0 R08: 0000000000000000 R09: 0000000000000101
[   38.289102] R10: ffffffffa5608110 R11: 0000000000000001 R12: 0000000000000000
[   38.289162] R13: ffffac448025fce8 R14: 0000000000000020 R15: ffffac448025fdf0
[   38.289222] FS:  0000000000000000(0000) GS:ffffa00cd8dd8000(0000) knlGS:0000000000000000
[   38.289292] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.289342] CR2: 0000000000000000 CR3: 0000000007641001 CR4: 0000000000772ef0
[   38.289406] PKRU: 55555554
[   38.289429] Call Trace:
[   38.289458]  <TASK>
[   38.289485]  __cancel_work+0x29/0xe0
[   38.289526]  ? dev_deactivate_many+0x2c9/0x300
[   38.289583]  __cancel_work_sync+0x16/0x80
[   38.289627]  __dev_close_many+0x11b/0x280
[   38.289671]  netif_close_many+0x98/0x160
[   38.289707]  unregister_netdevice_many_notify+0x1d8/0xa50
[   38.289757]  default_device_exit_batch+0x29b/0x300
[   38.289803]  ops_undo_list+0xec/0x1f0
[   38.289847]  cleanup_net+0x1b7/0x2b0
[   38.289885]  process_one_work+0x162/0x380
[   38.289924]  worker_thread+0x299/0x3c0
[   38.289971]  ? rescuer_thread+0x4c0/0x4c0
[   38.290004]  kthread+0x101/0x1f0
[   38.290048]  ? kthreads_online_cpu+0x110/0x110
[   38.290095]  ? kthreads_online_cpu+0x110/0x110
[   38.290137]  ret_from_fork+0x11c/0x140
[   38.290184]  ? kthreads_online_cpu+0x110/0x110
[   38.290228]  ret_from_fork_asm+0x11/0x20
[   38.290271]  </TASK>
[   38.290297] Modules linked in: nf_conntrack_netlink nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_numgen nf_tables
[   38.290395] CR2: 0000000000000000
[   38.290432] ---[ end trace 0000000000000000 ]---
[   38.290478] RIP: 0010:work_grab_pending+0x2f/0x1b0
[   38.290521] 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
[   38.290669] RSP: 0018:ffffac448025fbb8 EFLAGS: 00010046
[   38.290711] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[   38.290770] RDX: ffffac448025fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[   38.290826] RBP: ffffac448025fbf0 R08: 0000000000000000 R09: 0000000000000101
[   38.290885] R10: ffffffffa5608110 R11: 0000000000000001 R12: 0000000000000000
[   38.290945] R13: ffffac448025fce8 R14: 0000000000000020 R15: ffffac448025fdf0
[   38.291013] FS:  0000000000000000(0000) GS:ffffa00cd8dd8000(0000) knlGS:0000000000000000
[   38.291080] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.291129] CR2: 0000000000000000 CR3: 0000000007641001 CR4: 0000000000772ef0
[   38.291187] PKRU: 55555554
[   38.291212] note: kworker/u16:1[68] exited with irqs disabled