[    2.311703] ip (255) used greatest stack depth: 12136 bytes left
[    6.698312] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    6.698399] #PF: supervisor write access in kernel mode
[    6.698448] #PF: error_code(0x0002) - not-present page
[    6.698492] PGD 0 P4D 0 
[    6.698515] Oops: Oops: 0002 [#1] SMP
[    6.698555] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    6.698645] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.698700] Workqueue: netns cleanup_net
[    6.698739] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.698798] 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
[    6.698955] RSP: 0018:ffff9d2700067bb8 EFLAGS: 00010046
[    6.698999] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000004
[    6.699065] RDX: ffff9d2700067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.699131] RBP: ffff9d2700067bf0 R08: ffff8b37c1d5e483 R09: 0000000000000002
[    6.699198] R10: ffff8b37feda8640 R11: ffff8b37c1d5dc90 R12: 0000000000000000
[    6.699263] R13: ffff9d2700067ce8 R14: 0000000000000020 R15: ffff9d2700067df0
[    6.699329] FS:  0000000000000000(0000) GS:ffff8b3849958000(0000) knlGS:0000000000000000
[    6.699408] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.699464] CR2: 0000000000000000 CR3: 00000000089ff003 CR4: 0000000000772ef0
[    6.699532] PKRU: 55555554
[    6.699553] Call Trace:
[    6.699578]  <TASK>
[    6.699607]  __cancel_work+0x29/0xe0
[    6.699646]  ? queue_delayed_work_on+0x54/0x60
[    6.699697]  __cancel_work_sync+0x16/0x80
[    6.699736]  __dev_close_many+0x11b/0x280
[    6.699770]  netif_close_many+0x98/0x160
[    6.699803]  ? rcu_barrier_entrain+0xb0/0xb0
[    6.699851]  unregister_netdevice_many_notify+0x1d8/0xa50
[    6.699898]  ? unregister_netdevice_queue+0x29/0xe0
[    6.699949]  default_device_exit_batch+0x29b/0x300
[    6.699995]  ops_undo_list+0xec/0x1f0
[    6.700033]  cleanup_net+0x1b7/0x2b0
[    6.700072]  process_one_work+0x162/0x380
[    6.700110]  worker_thread+0x299/0x3c0
[    6.700149]  ? rescuer_thread+0x4c0/0x4c0
[    6.700183]  kthread+0x101/0x1f0
[    6.700227]  ? kthreads_online_cpu+0x110/0x110
[    6.700276]  ? kthreads_online_cpu+0x110/0x110
[    6.700325]  ret_from_fork+0x11c/0x140
[    6.700365]  ? kthreads_online_cpu+0x110/0x110
[    6.700415]  ret_from_fork_asm+0x11/0x20
[    6.700458]  </TASK>
[    6.700485] Modules linked in: tcp_diag inet_diag nft_tproxy nf_tproxy_ipv6 nf_tproxy_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[    6.700598] CR2: 0000000000000000
[    6.700636] ---[ end trace 0000000000000000 ]---
[    6.700678] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.700731] 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
[    6.700893] RSP: 0018:ffff9d2700067bb8 EFLAGS: 00010046
[    6.700938] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000004
[    6.701005] RDX: ffff9d2700067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.701072] RBP: ffff9d2700067bf0 R08: ffff8b37c1d5e483 R09: 0000000000000002
[    6.701137] R10: ffff8b37feda8640 R11: ffff8b37c1d5dc90 R12: 0000000000000000
[    6.701204] R13: ffff9d2700067ce8 R14: 0000000000000020 R15: ffff9d2700067df0
[    6.701271] FS:  0000000000000000(0000) GS:ffff8b3849958000(0000) knlGS:0000000000000000
[    6.701343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.701398] CR2: 0000000000000000 CR3: 00000000089ff003 CR4: 0000000000772ef0
[    6.701467] PKRU: 55555554
[    6.701488] note: kworker/u16:0[12] exited with irqs disabled