[    2.289282] ip (270) used greatest stack depth: 12168 bytes left
[    4.977682] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    4.977765] #PF: supervisor write access in kernel mode
[    4.977820] #PF: error_code(0x0002) - not-present page
[    4.977863] PGD 0 P4D 0 
[    4.977891] Oops: Oops: 0002 [#1] SMP
[    4.977927] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    4.978000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.978049] Workqueue: netns cleanup_net
[    4.978093] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.978141] 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
[    4.978329] RSP: 0018:ffffaac440067bb8 EFLAGS: 00010046
[    4.978381] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.978440] RDX: ffffaac440067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.978514] RBP: ffffaac440067bf0 R08: ffff93ff8139b673 R09: 0000000000000002
[    4.978566] R10: ffff93ffbec28840 R11: ffff93ff8139ae90 R12: 0000000000000000
[    4.978629] R13: ffffaac440067ce8 R14: 0000000000000020 R15: ffffaac440067df0
[    4.978692] FS:  0000000000000000(0000) GS:ffff940002991000(0000) knlGS:0000000000000000
[    4.978752] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.978805] CR2: 0000000000000000 CR3: 000000002e446006 CR4: 0000000000772ef0
[    4.978880] PKRU: 55555554
[    4.978902] Call Trace:
[    4.978928]  <TASK>
[    4.978953]  __cancel_work+0x29/0xe0
[    4.978994]  ? queue_delayed_work_on+0x54/0x60
[    4.979038]  __cancel_work_sync+0x16/0x80
[    4.979077]  __dev_close_many+0x113/0x2b0
[    4.979113]  netif_close_many+0x98/0x160
[    4.979146]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    4.979200]  ? unregister_netdevice_queue+0x29/0xe0
[    4.979241]  default_device_exit_batch+0x29b/0x300
[    4.979284]  ? mutex_lock+0x12/0x30
[    4.979329]  ops_undo_list+0xec/0x1f0
[    4.979371]  cleanup_net+0x1b7/0x300
[    4.979406]  process_one_work+0x162/0x380
[    4.979447]  worker_thread+0x299/0x3c0
[    4.979480]  ? rescuer_thread+0x4c0/0x4c0
[    4.979519]  kthread+0x101/0x1f0
[    4.979552]  ? kthreads_online_cpu+0x110/0x110
[    4.979593]  ? kthreads_online_cpu+0x110/0x110
[    4.979636]  ret_from_fork+0x11c/0x140
[    4.979676]  ? kthreads_online_cpu+0x110/0x110
[    4.979728]  ret_from_fork_asm+0x11/0x20
[    4.979763]  </TASK>
[    4.979792] Modules linked in:
[    4.979837] CR2: 0000000000000000
[    4.979885] ---[ end trace 0000000000000000 ]---
[    4.979937] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.979981] 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
[    4.980118] RSP: 0018:ffffaac440067bb8 EFLAGS: 00010046
[    4.980153] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.980228] RDX: ffffaac440067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.980288] RBP: ffffaac440067bf0 R08: ffff93ff8139b673 R09: 0000000000000002
[    4.980340] R10: ffff93ffbec28840 R11: ffff93ff8139ae90 R12: 0000000000000000
[    4.980399] R13: ffffaac440067ce8 R14: 0000000000000020 R15: ffffaac440067df0
[    4.980469] FS:  0000000000000000(0000) GS:ffff940002991000(0000) knlGS:0000000000000000
[    4.980534] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.980582] CR2: 0000000000000000 CR3: 000000002e446006 CR4: 0000000000772ef0
[    4.980643] PKRU: 55555554
[    4.980668] note: kworker/u16:0[12] exited with irqs disabled

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