[    2.319367] u32 classifier
[    2.319417]     input device check on
[    2.319451]     Actions configured
[    2.342655] netem: version 1.3
[    2.488548] sctp: Hash tables configured (bind 256/256)
[    2.819734] htb: netem qdisc 10: is non-work-conserving?
[    4.611124] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    4.611212] #PF: supervisor write access in kernel mode
[    4.611267] #PF: error_code(0x0002) - not-present page
[    4.611310] PGD 0 P4D 0 
[    4.611350] Oops: Oops: 0002 [#1] SMP
[    4.611397] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    4.611492] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.611555] Workqueue: netns cleanup_net
[    4.611600] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.611663] 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
[    4.611824] RSP: 0018:ffffc08ec0067bb8 EFLAGS: 00010046
[    4.611869] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.611942] RDX: ffffc08ec0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.612029] RBP: ffffc08ec0067bf0 R08: ffff9dfec1393683 R09: 0000000000000002
[    4.612093] R10: ffff9dfefec28640 R11: ffff9dfec1392e90 R12: 0000000000000000
[    4.612182] R13: ffffc08ec0067ce8 R14: 0000000000000020 R15: ffffc08ec0067df0
[    4.612251] FS:  0000000000000000(0000) GS:ffff9dff4e1d8000(0000) knlGS:0000000000000000
[    4.612324] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.612394] CR2: 0000000000000000 CR3: 0000000021041006 CR4: 0000000000772ef0
[    4.612471] PKRU: 55555554
[    4.612495] Call Trace:
[    4.612532]  <TASK>
[    4.612567]  __cancel_work+0x29/0xe0
[    4.612617]  ? queue_delayed_work_on+0x54/0x60
[    4.612667]  __cancel_work_sync+0x16/0x80
[    4.612707]  __dev_close_many+0x11b/0x280
[    4.612750]  netif_close_many+0x98/0x160
[    4.612795]  unregister_netdevice_many_notify+0x1d8/0xa50
[    4.612861]  ? unregister_netdevice_queue+0x29/0xe0
[    4.612912]  default_device_exit_batch+0x29b/0x300
[    4.612959]  ops_undo_list+0xec/0x1f0
[    4.613002]  cleanup_net+0x1b7/0x2b0
[    4.613050]  process_one_work+0x162/0x380
[    4.613089]  worker_thread+0x299/0x3c0
[    4.613132]  ? rescuer_thread+0x4c0/0x4c0
[    4.613167]  kthread+0x101/0x1f0
[    4.613211]  ? kthreads_online_cpu+0x110/0x110
[    4.613260]  ? kthreads_online_cpu+0x110/0x110
[    4.613307]  ret_from_fork+0x11c/0x140
[    4.613350]  ? kthreads_online_cpu+0x110/0x110
[    4.613402]  ret_from_fork_asm+0x11/0x20
[    4.613457]  </TASK>
[    4.613484] Modules linked in: sctp ip6_udp_tunnel udp_tunnel xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables x_tables sch_netem cls_u32 sch_htb veth
[    4.613648] CR2: 0000000000000000
[    4.613686] ---[ end trace 0000000000000000 ]---
[    4.613731] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.613779] 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
[    4.613972] RSP: 0018:ffffc08ec0067bb8 EFLAGS: 00010046
[    4.614022] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.614088] RDX: ffffc08ec0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.614160] RBP: ffffc08ec0067bf0 R08: ffff9dfec1393683 R09: 0000000000000002
[    4.614240] R10: ffff9dfefec28640 R11: ffff9dfec1392e90 R12: 0000000000000000
[    4.614318] R13: ffffc08ec0067ce8 R14: 0000000000000020 R15: ffffc08ec0067df0
[    4.614397] FS:  0000000000000000(0000) GS:ffff9dff4e1d8000(0000) knlGS:0000000000000000
[    4.614467] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.614530] CR2: 0000000000000000 CR3: 0000000021041006 CR4: 0000000000772ef0
[    4.614613] PKRU: 55555554
[    4.614645] note: kworker/u16:0[12] exited with irqs disabled