[    4.541598] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    4.541700] #PF: supervisor write access in kernel mode
[    4.541756] #PF: error_code(0x0002) - not-present page
[    4.541810] PGD 0 P4D 0 
[    4.541837] Oops: Oops: 0002 [#1] SMP
[    4.541885] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    4.541985] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.542052] Workqueue: netns cleanup_net
[    4.542110] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.542174] 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
[    4.542359] RSP: 0018:ffff9e88c024fbb8 EFLAGS: 00010046
[    4.542424] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    4.542505] RDX: ffff9e88c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.542587] RBP: ffff9e88c024fbf0 R08: ffffffff9f093e00 R09: 0000000000000101
[    4.542666] R10: ffffffff9fc080d8 R11: ffff9e88c013cff8 R12: 0000000000000000
[    4.542745] R13: ffff9e88c024fce8 R14: 0000000000000020 R15: ffff9e88c024fdf0
[    4.542827] FS:  0000000000000000(0000) GS:ffff8cff9e911000(0000) knlGS:0000000000000000
[    4.542917] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.542989] CR2: 0000000000000000 CR3: 000000000480c006 CR4: 0000000000772ef0
[    4.543070] PKRU: 55555554
[    4.543094] Call Trace:
[    4.543127]  <TASK>
[    4.543162]  __cancel_work+0x29/0xe0
[    4.543216]  ? dev_deactivate_many+0x2c9/0x300
[    4.543280]  __cancel_work_sync+0x16/0x80
[    4.543321]  __dev_close_many+0x113/0x2b0
[    4.543372]  netif_close_many+0x98/0x160
[    4.543417]  ? rcu_barrier_entrain+0xb0/0xb0
[    4.543484]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    4.543539]  default_device_exit_batch+0x29b/0x300
[    4.543594]  ? mutex_lock+0x12/0x30
[    4.543649]  ops_undo_list+0xec/0x1f0
[    4.543692]  cleanup_net+0x1b7/0x300
[    4.543739]  process_one_work+0x162/0x380
[    4.543786]  worker_thread+0x299/0x3c0
[    4.543835]  ? rescuer_thread+0x4c0/0x4c0
[    4.543877]  kthread+0x101/0x1f0
[    4.543927]  ? kthreads_online_cpu+0x110/0x110
[    4.543981]  ? kthreads_online_cpu+0x110/0x110
[    4.544034]  ret_from_fork+0x11c/0x140
[    4.544083]  ? kthreads_online_cpu+0x110/0x110
[    4.544139]  ret_from_fork_asm+0x11/0x20
[    4.544189]  </TASK>
[    4.544213] Modules linked in:
[    4.544258] CR2: 0000000000000000
[    4.544302] ---[ end trace 0000000000000000 ]---
[    4.544353] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.544407] 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
[    4.544614] RSP: 0018:ffff9e88c024fbb8 EFLAGS: 00010046
[    4.544666] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    4.544745] RDX: ffff9e88c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.544825] RBP: ffff9e88c024fbf0 R08: ffffffff9f093e00 R09: 0000000000000101
[    4.544904] R10: ffffffff9fc080d8 R11: ffff9e88c013cff8 R12: 0000000000000000
[    4.544983] R13: ffff9e88c024fce8 R14: 0000000000000020 R15: ffff9e88c024fdf0
[    4.545064] FS:  0000000000000000(0000) GS:ffff8cff9e911000(0000) knlGS:0000000000000000
[    4.545142] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.545205] CR2: 0000000000000000 CR3: 000000000480c006 CR4: 0000000000772ef0
[    4.545284] PKRU: 55555554
[    4.545317] note: kworker/u16:1[66] exited with irqs disabled

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