[    2.177233] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.177318] #PF: supervisor write access in kernel mode
[    2.177362] #PF: error_code(0x0002) - not-present page
[    2.177409] PGD 0 P4D 0 
[    2.177432] Oops: Oops: 0002 [#1] SMP
[    2.177466] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.177553] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.177611] Workqueue: netns cleanup_net
[    2.177652] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.177701] 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
[    2.177861] RSP: 0018:ffffabc20024fbb8 EFLAGS: 00010046
[    2.177906] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.177975] RDX: ffffabc20024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.178056] RBP: ffffabc20024fbf0 R08: ffffffffacc93e00 R09: 0000000000000101
[    2.178125] R10: ffffffffad8080d8 R11: ffffabc20013cff8 R12: 0000000000000000
[    2.178195] R13: ffffabc20024fce8 R14: 0000000000000020 R15: ffffabc20024fdf0
[    2.178266] FS:  0000000000000000(0000) GS:ffff8d2f10d11000(0000) knlGS:0000000000000000
[    2.178341] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.178398] CR2: 0000000000000000 CR3: 0000000004394006 CR4: 0000000000772ef0
[    2.178470] PKRU: 55555554
[    2.178498] Call Trace:
[    2.178524]  <TASK>
[    2.178546]  __cancel_work+0x29/0xe0
[    2.178586]  ? dev_deactivate_many+0x2c9/0x300
[    2.178639]  __cancel_work_sync+0x16/0x80
[    2.178672]  __dev_close_many+0x113/0x2b0
[    2.178716]  netif_close_many+0x98/0x160
[    2.178748]  ? rcu_barrier_entrain+0xb0/0xb0
[    2.178795]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.178847]  default_device_exit_batch+0x29b/0x300
[    2.178893]  ? mutex_lock+0x12/0x30
[    2.178933]  ops_undo_list+0xec/0x1f0
[    2.178970]  cleanup_net+0x1b7/0x300
[    2.179010]  process_one_work+0x162/0x380
[    2.179044]  worker_thread+0x299/0x3c0
[    2.179083]  ? rescuer_thread+0x4c0/0x4c0
[    2.179115]  kthread+0x101/0x1f0
[    2.179150]  ? kthreads_online_cpu+0x110/0x110
[    2.179196]  ? kthreads_online_cpu+0x110/0x110
[    2.179241]  ret_from_fork+0x11c/0x140
[    2.179283]  ? kthreads_online_cpu+0x110/0x110
[    2.179329]  ret_from_fork_asm+0x11/0x20
[    2.179366]  </TASK>
[    2.179388] Modules linked in:
[    2.179423] CR2: 0000000000000000
[    2.179456] ---[ end trace 0000000000000000 ]---
[    2.179501] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.179547] 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
[    2.179705] RSP: 0018:ffffabc20024fbb8 EFLAGS: 00010046
[    2.179750] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.179820] RDX: ffffabc20024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.179893] RBP: ffffabc20024fbf0 R08: ffffffffacc93e00 R09: 0000000000000101
[    2.179962] R10: ffffffffad8080d8 R11: ffffabc20013cff8 R12: 0000000000000000
[    2.180032] R13: ffffabc20024fce8 R14: 0000000000000020 R15: ffffabc20024fdf0
[    2.180101] FS:  0000000000000000(0000) GS:ffff8d2f10d11000(0000) knlGS:0000000000000000
[    2.180169] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.180225] CR2: 0000000000000000 CR3: 0000000004394006 CR4: 0000000000772ef0
[    2.180293] PKRU: 55555554
[    2.180315] note: kworker/u16:1[66] exited with irqs disabled

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