[    3.326546] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    3.326637] #PF: supervisor write access in kernel mode
[    3.326687] #PF: error_code(0x0002) - not-present page
[    3.326739] PGD 0 P4D 0 
[    3.326763] Oops: Oops: 0002 [#1] SMP
[    3.326803] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    3.326885] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.326949] Workqueue: netns cleanup_net
[    3.326991] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.327045] 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
[    3.327221] RSP: 0018:ffffb73400067bb8 EFLAGS: 00010046
[    3.327273] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000088
[    3.327350] RDX: ffffb73400067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.327426] RBP: ffffb73400067bf0 R08: ffffffff96893e00 R09: 0000000000000101
[    3.327498] R10: ffffffff974080d8 R11: ffffb73400003ff8 R12: 0000000000000000
[    3.327572] R13: ffffb73400067ce8 R14: 0000000000000020 R15: ffffb73400067df0
[    3.327650] FS:  0000000000000000(0000) GS:ffff955e66f91000(0000) knlGS:0000000000000000
[    3.327732] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.327792] CR2: 0000000000000000 CR3: 000000002c246006 CR4: 0000000000772ef0
[    3.327868] PKRU: 55555554
[    3.327892] Call Trace:
[    3.327920]  <TASK>
[    3.327946]  __cancel_work+0x29/0xe0
[    3.327988]  __cancel_work_sync+0x16/0x80
[    3.328025]  __dev_close_many+0x113/0x2b0
[    3.328072]  netif_close_many+0x98/0x160
[    3.328108]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    3.328158]  ? unregister_netdevice_queue+0x29/0xe0
[    3.328207]  default_device_exit_batch+0x29b/0x300
[    3.328256]  ? mutex_lock+0x12/0x30
[    3.328301]  ops_undo_list+0xec/0x1f0
[    3.328339]  cleanup_net+0x1b7/0x300
[    3.328376]  process_one_work+0x162/0x380
[    3.328416]  worker_thread+0x299/0x3c0
[    3.328452]  ? rescuer_thread+0x4c0/0x4c0
[    3.328491]  kthread+0x101/0x1f0
[    3.328528]  ? kthreads_online_cpu+0x110/0x110
[    3.328576]  ? kthreads_online_cpu+0x110/0x110
[    3.328626]  ret_from_fork+0x11c/0x140
[    3.328673]  ? kthreads_online_cpu+0x110/0x110
[    3.328722]  ret_from_fork_asm+0x11/0x20
[    3.328761]  </TASK>
[    3.328786] Modules linked in:
[    3.328834] CR2: 0000000000000000
[    3.328872] ---[ end trace 0000000000000000 ]---
[    3.328922] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.328963] 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
[    3.329083] RSP: 0018:ffffb73400067bb8 EFLAGS: 00010046
[    3.329117] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000088
[    3.329167] RDX: ffffb73400067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.329218] RBP: ffffb73400067bf0 R08: ffffffff96893e00 R09: 0000000000000101
[    3.329269] R10: ffffffff974080d8 R11: ffffb73400003ff8 R12: 0000000000000000
[    3.329319] R13: ffffb73400067ce8 R14: 0000000000000020 R15: ffffb73400067df0
[    3.329369] FS:  0000000000000000(0000) GS:ffff955e66f91000(0000) knlGS:0000000000000000
[    3.329419] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.329461] CR2: 0000000000000000 CR3: 000000002c246006 CR4: 0000000000772ef0
[    3.329513] PKRU: 55555554
[    3.329535] note: kworker/u16:0[12] exited with irqs disabled

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