[    3.356219] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    3.356299] #PF: supervisor write access in kernel mode
[    3.356348] #PF: error_code(0x0002) - not-present page
[    3.356395] PGD 0 P4D 0 
[    3.356420] Oops: Oops: 0002 [#1] SMP
[    3.356457] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    3.356535] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.356595] Workqueue: netns cleanup_net
[    3.356636] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.356694] 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
[    3.356830] RSP: 0018:ffffaf744024fbb8 EFLAGS: 00010046
[    3.356866] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    3.356927] RDX: ffffaf744024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.356987] RBP: ffffaf744024fbf0 R08: ffff96314139b673 R09: 0000000000000002
[    3.357042] R10: ffff96317ec28840 R11: ffff96314139ae90 R12: 0000000000000000
[    3.357124] R13: ffffaf744024fce8 R14: 0000000000000020 R15: ffffaf744024fdf0
[    3.357198] FS:  0000000000000000(0000) GS:ffff9631d3991000(0000) knlGS:0000000000000000
[    3.357262] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.357312] CR2: 0000000000000000 CR3: 0000000010446004 CR4: 0000000000772ef0
[    3.357374] PKRU: 55555554
[    3.357392] Call Trace:
[    3.357426]  <TASK>
[    3.357450]  __cancel_work+0x29/0xe0
[    3.357488]  ? queue_delayed_work_on+0x54/0x60
[    3.357536]  __cancel_work_sync+0x16/0x80
[    3.357569]  __dev_close_many+0x113/0x2b0
[    3.357611]  netif_close_many+0x98/0x160
[    3.357644]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    3.357682]  ? unregister_netdevice_queue+0x29/0xe0
[    3.357731]  default_device_exit_batch+0x29b/0x300
[    3.357782]  ? mutex_lock+0x12/0x30
[    3.357819]  ops_undo_list+0xec/0x1f0
[    3.357855]  cleanup_net+0x1b7/0x300
[    3.357894]  process_one_work+0x162/0x380
[    3.357939]  worker_thread+0x299/0x3c0
[    3.357986]  ? rescuer_thread+0x4c0/0x4c0
[    3.358021]  kthread+0x101/0x1f0
[    3.358060]  ? kthreads_online_cpu+0x110/0x110
[    3.358102]  ? kthreads_online_cpu+0x110/0x110
[    3.358145]  ret_from_fork+0x11c/0x140
[    3.358184]  ? kthreads_online_cpu+0x110/0x110
[    3.358232]  ret_from_fork_asm+0x11/0x20
[    3.358273]  </TASK>
[    3.358296] Modules linked in:
[    3.358339] CR2: 0000000000000000
[    3.358375] ---[ end trace 0000000000000000 ]---
[    3.358423] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.358473] 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
[    3.358618] RSP: 0018:ffffaf744024fbb8 EFLAGS: 00010046
[    3.358660] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    3.358731] RDX: ffffaf744024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.358807] RBP: ffffaf744024fbf0 R08: ffff96314139b673 R09: 0000000000000002
[    3.358869] R10: ffff96317ec28840 R11: ffff96314139ae90 R12: 0000000000000000
[    3.358935] R13: ffffaf744024fce8 R14: 0000000000000020 R15: ffffaf744024fdf0
[    3.358998] FS:  0000000000000000(0000) GS:ffff9631d3991000(0000) knlGS:0000000000000000
[    3.359059] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.359116] CR2: 0000000000000000 CR3: 0000000010446004 CR4: 0000000000772ef0
[    3.359186] PKRU: 55555554
[    3.359208] note: kworker/u16:1[66] exited with irqs disabled

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