[    8.281343] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    8.281448] #PF: supervisor write access in kernel mode
[    8.281507] #PF: error_code(0x0002) - not-present page
[    8.281563] PGD 0 P4D 0 
[    8.281608] Oops: Oops: 0002 [#1] SMP
[    8.281670] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    8.281777] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.281853] Workqueue: netns cleanup_net
[    8.281926] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    8.282015] 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
[    8.282223] RSP: 0018:ffffb6bb80067bb8 EFLAGS: 00010046
[    8.282294] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    8.282401] RDX: ffffb6bb80067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    8.282486] RBP: ffffb6bb80067bf0 R08: ffff9c6481393683 R09: 0000000000000002
[    8.282570] R10: ffff9c64bec28640 R11: ffff9c6481392e90 R12: 0000000000000000
[    8.282656] R13: ffffb6bb80067ce8 R14: 0000000000000020 R15: ffffb6bb80067df0
[    8.282744] FS:  0000000000000000(0000) GS:ffff9c6526dd8000(0000) knlGS:0000000000000000
[    8.282837] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.282910] CR2: 0000000000000000 CR3: 00000000068ef002 CR4: 0000000000772ef0
[    8.282996] PKRU: 55555554
[    8.283021] Call Trace:
[    8.283051]  <TASK>
[    8.283087]  __cancel_work+0x29/0xe0
[    8.283143]  ? queue_delayed_work_on+0x54/0x60
[    8.283202]  __cancel_work_sync+0x16/0x80
[    8.283252]  __dev_close_many+0x11b/0x280
[    8.283310]  netif_close_many+0x98/0x160
[    8.283357]  unregister_netdevice_many_notify+0x1d8/0xa50
[    8.283427]  ? unregister_netdevice_queue+0x29/0xe0
[    8.283488]  default_device_exit_batch+0x29b/0x300
[    8.283544]  ops_undo_list+0xec/0x1f0
[    8.283602]  cleanup_net+0x1b7/0x2b0
[    8.283656]  process_one_work+0x162/0x380
[    8.283708]  worker_thread+0x299/0x3c0
[    8.283752]  ? rescuer_thread+0x4c0/0x4c0
[    8.283800]  kthread+0x101/0x1f0
[    8.283847]  ? kthreads_online_cpu+0x110/0x110
[    8.283911]  ? kthreads_online_cpu+0x110/0x110
[    8.283968]  ret_from_fork+0x11c/0x140
[    8.284030]  ? kthreads_online_cpu+0x110/0x110
[    8.284090]  ret_from_fork_asm+0x11/0x20
[    8.284147]  </TASK>
[    8.284179] Modules linked in: nft_masq nft_chain_nat nf_nat nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[    8.284325] CR2: 0000000000000000
[    8.284373] ---[ end trace 0000000000000000 ]---
[    8.284433] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    8.284496] 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
[    8.284697] RSP: 0018:ffffb6bb80067bb8 EFLAGS: 00010046
[    8.284759] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000c00
[    8.284849] RDX: ffffb6bb80067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    8.284937] RBP: ffffb6bb80067bf0 R08: ffff9c6481393683 R09: 0000000000000002
[    8.285024] R10: ffff9c64bec28640 R11: ffff9c6481392e90 R12: 0000000000000000
[    8.285105] R13: ffffb6bb80067ce8 R14: 0000000000000020 R15: ffffb6bb80067df0
[    8.285203] FS:  0000000000000000(0000) GS:ffff9c6526dd8000(0000) knlGS:0000000000000000
[    8.285289] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.285361] CR2: 0000000000000000 CR3: 00000000068ef002 CR4: 0000000000772ef0
[    8.285442] PKRU: 55555554
[    8.285474] note: kworker/u16:0[12] exited with irqs disabled