[    6.899046] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    6.899131] #PF: supervisor write access in kernel mode
[    6.899188] #PF: error_code(0x0002) - not-present page
[    6.899238] PGD 0 P4D 0 
[    6.899267] Oops: Oops: 0002 [#1] SMP
[    6.899302] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    6.899392] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.899456] Workqueue: netns cleanup_net
[    6.899498] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.899551] 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
[    6.899721] RSP: 0018:ffffbfb14025fbb8 EFLAGS: 00010046
[    6.899778] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    6.899851] RDX: ffffbfb14025fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.899926] RBP: ffffbfb14025fbf0 R08: ffffffffbae6d160 R09: 0000000000000101
[    6.900000] R10: ffffffffbb6080d8 R11: ffffbfb140003ff8 R12: 0000000000000000
[    6.900071] R13: ffffbfb14025fce8 R14: 0000000000000020 R15: ffffbfb14025fdf0
[    6.900146] FS:  0000000000000000(0000) GS:ffff9d77c2dd8000(0000) knlGS:0000000000000000
[    6.900224] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.900292] CR2: 0000000000000000 CR3: 0000000003bbc001 CR4: 0000000000772ef0
[    6.900367] PKRU: 55555554
[    6.900397] Call Trace:
[    6.900423]  <TASK>
[    6.900454]  __cancel_work+0x29/0xe0
[    6.900494]  ? dev_deactivate_many+0x2c9/0x300
[    6.900551]  __cancel_work_sync+0x16/0x80
[    6.900587]  __dev_close_many+0x11b/0x280
[    6.900629]  netif_close_many+0x98/0x160
[    6.900667]  unregister_netdevice_many_notify+0x1d8/0xa50
[    6.900723]  default_device_exit_batch+0x29b/0x300
[    6.900776]  ops_undo_list+0xec/0x1f0
[    6.900817]  cleanup_net+0x1b7/0x2b0
[    6.900852]  process_one_work+0x162/0x380
[    6.900888]  worker_thread+0x299/0x3c0
[    6.900925]  ? rescuer_thread+0x4c0/0x4c0
[    6.900963]  kthread+0x101/0x1f0
[    6.900999]  ? kthreads_online_cpu+0x110/0x110
[    6.901053]  ? kthreads_online_cpu+0x110/0x110
[    6.901102]  ret_from_fork+0x11c/0x140
[    6.901146]  ? kthreads_online_cpu+0x110/0x110
[    6.901200]  ret_from_fork_asm+0x11/0x20
[    6.901245]  </TASK>
[    6.901269] Modules linked in: nf_conntrack_netlink nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables
[    6.901394] CR2: 0000000000000000
[    6.901433] ---[ end trace 0000000000000000 ]---
[    6.901484] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.901538] 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
[    6.901710] RSP: 0018:ffffbfb14025fbb8 EFLAGS: 00010046
[    6.901766] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    6.901840] RDX: ffffbfb14025fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.901915] RBP: ffffbfb14025fbf0 R08: ffffffffbae6d160 R09: 0000000000000101
[    6.901991] R10: ffffffffbb6080d8 R11: ffffbfb140003ff8 R12: 0000000000000000
[    6.902064] R13: ffffbfb14025fce8 R14: 0000000000000020 R15: ffffbfb14025fdf0
[    6.902140] FS:  0000000000000000(0000) GS:ffff9d77c2dd8000(0000) knlGS:0000000000000000
[    6.902215] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.902276] CR2: 0000000000000000 CR3: 0000000003bbc001 CR4: 0000000000772ef0
[    6.902353] PKRU: 55555554
[    6.902376] note: kworker/u16:1[68] exited with irqs disabled