[    2.176314] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.176422] #PF: supervisor write access in kernel mode
[    2.176472] #PF: error_code(0x0002) - not-present page
[    2.176524] PGD 0 P4D 0 
[    2.176551] Oops: Oops: 0002 [#1] SMP
[    2.176599] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.176698] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.176782] Workqueue: netns cleanup_net
[    2.176838] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.176909] 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
[    2.177102] RSP: 0018:ffffabadc0067bb8 EFLAGS: 00010046
[    2.177155] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000000
[    2.177233] RDX: ffffabadc0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.177307] RBP: ffffabadc0067bf0 R08: ffffffff8a893e00 R09: 0000000000000101
[    2.177385] R10: ffffffff8b4080d8 R11: ffffabadc0003ff8 R12: 0000000000000000
[    2.177464] R13: ffffabadc0067ce8 R14: 0000000000000020 R15: ffffabadc0067df0
[    2.177546] FS:  0000000000000000(0000) GS:ffff9beab2f91000(0000) knlGS:0000000000000000
[    2.177630] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.177695] CR2: 0000000000000000 CR3: 000000003ce46003 CR4: 0000000000772ef0
[    2.177775] PKRU: 55555554
[    2.177807] Call Trace:
[    2.177834]  <TASK>
[    2.177861]  __cancel_work+0x29/0xe0
[    2.177914]  ? queue_delayed_work_on+0x54/0x60
[    2.177966]  __cancel_work_sync+0x16/0x80
[    2.178006]  __dev_close_many+0x113/0x2b0
[    2.178054]  netif_close_many+0x98/0x160
[    2.178100]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.178169]  ? unregister_netdevice_queue+0x29/0xe0
[    2.178230]  default_device_exit_batch+0x29b/0x300
[    2.178289]  ? mutex_lock+0x12/0x30
[    2.178335]  ops_undo_list+0xec/0x1f0
[    2.178382]  cleanup_net+0x1b7/0x300
[    2.178421]  process_one_work+0x162/0x380
[    2.178468]  worker_thread+0x299/0x3c0
[    2.178515]  ? rescuer_thread+0x4c0/0x4c0
[    2.178560]  kthread+0x101/0x1f0
[    2.178600]  ? kthreads_online_cpu+0x110/0x110
[    2.178653]  ? kthreads_online_cpu+0x110/0x110
[    2.178706]  ret_from_fork+0x11c/0x140
[    2.178753]  ? kthreads_online_cpu+0x110/0x110
[    2.178813]  ret_from_fork_asm+0x11/0x20
[    2.178861]  </TASK>
[    2.178893] Modules linked in:
[    2.178934] CR2: 0000000000000000
[    2.178972] ---[ end trace 0000000000000000 ]---
[    2.179025] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.179085] 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
[    2.179267] RSP: 0018:ffffabadc0067bb8 EFLAGS: 00010046
[    2.179320] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000000
[    2.179400] RDX: ffffabadc0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.179485] RBP: ffffabadc0067bf0 R08: ffffffff8a893e00 R09: 0000000000000101
[    2.179570] R10: ffffffff8b4080d8 R11: ffffabadc0003ff8 R12: 0000000000000000
[    2.179649] R13: ffffabadc0067ce8 R14: 0000000000000020 R15: ffffabadc0067df0
[    2.179729] FS:  0000000000000000(0000) GS:ffff9beab2f91000(0000) knlGS:0000000000000000
[    2.179814] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.179879] CR2: 0000000000000000 CR3: 000000003ce46003 CR4: 0000000000772ef0
[    2.179958] PKRU: 55555554
[    2.179983] note: kworker/u16:0[12] exited with irqs disabled

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