[    1.889340] ip (262) used greatest stack depth: 12408 bytes left
[    2.012360] GACT probability NOT on
[    2.013265] tc (272) used greatest stack depth: 11840 bytes left
[    6.055615] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    6.055696] #PF: supervisor write access in kernel mode
[    6.055739] #PF: error_code(0x0002) - not-present page
[    6.055785] PGD 0 P4D 0 
[    6.055813] Oops: Oops: 0002 [#1] SMP
[    6.055856] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    6.055933] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.055987] Workqueue: netns cleanup_net
[    6.056031] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.056085] 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
[    6.056222] RSP: 0018:ffffb7a7c024fbb8 EFLAGS: 00010046
[    6.056267] RAX: 0000000000000246 RBX: 0000000000000000 RCX: ffffffff9f9be7a9
[    6.056323] RDX: ffffb7a7c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.056379] RBP: ffffb7a7c024fbf0 R08: 0000000000000400 R09: 0000000000000001
[    6.056435] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[    6.056504] R13: ffffb7a7c024fce8 R14: 0000000000000020 R15: ffffb7a7c024fdf0
[    6.056569] FS:  0000000000000000(0000) GS:ffff9e325e511000(0000) knlGS:0000000000000000
[    6.056631] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.056684] CR2: 0000000000000000 CR3: 0000000001b25002 CR4: 0000000000772ef0
[    6.056741] PKRU: 55555554
[    6.056764] Call Trace:
[    6.056792]  <TASK>
[    6.056819]  __cancel_work+0x29/0xe0
[    6.056872]  ? dev_deactivate_many+0x2c9/0x300
[    6.056936]  __cancel_work_sync+0x16/0x80
[    6.056977]  __dev_close_many+0x113/0x2b0
[    6.057026]  netif_close_many+0x98/0x160
[    6.057075]  unregister_netdevice_many_notify+0x10c/0xaa0
[    6.057131]  ? vlan_vid_del+0xfc/0x180
[    6.057173]  default_device_exit_batch+0x29b/0x300
[    6.057213]  ? mutex_lock+0x12/0x30
[    6.057254]  ops_undo_list+0xec/0x1f0
[    6.057289]  cleanup_net+0x1b7/0x300
[    6.057324]  process_one_work+0x162/0x380
[    6.057358]  worker_thread+0x299/0x3c0
[    6.057394]  ? rescuer_thread+0x4c0/0x4c0
[    6.057427]  kthread+0x101/0x1f0
[    6.057462]  ? kthreads_online_cpu+0x110/0x110
[    6.057505]  ? kthreads_online_cpu+0x110/0x110
[    6.057548]  ret_from_fork+0x11c/0x140
[    6.057590]  ? kthreads_online_cpu+0x110/0x110
[    6.057635]  ret_from_fork_asm+0x11/0x20
[    6.057673]  </TASK>
[    6.057695] Modules linked in: act_gact cls_flower sch_ingress
[    6.057749] CR2: 0000000000000000
[    6.057782] ---[ end trace 0000000000000000 ]---
[    6.057829] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    6.057879] 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
[    6.058016] RSP: 0018:ffffb7a7c024fbb8 EFLAGS: 00010046
[    6.058061] RAX: 0000000000000246 RBX: 0000000000000000 RCX: ffffffff9f9be7a9
[    6.058116] RDX: ffffb7a7c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    6.058179] RBP: ffffb7a7c024fbf0 R08: 0000000000000400 R09: 0000000000000001
[    6.058236] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[    6.058294] R13: ffffb7a7c024fce8 R14: 0000000000000020 R15: ffffb7a7c024fdf0
[    6.058352] FS:  0000000000000000(0000) GS:ffff9e325e511000(0000) knlGS:0000000000000000
[    6.058413] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.058466] CR2: 0000000000000000 CR3: 0000000001b25002 CR4: 0000000000772ef0
[    6.058532] PKRU: 55555554
[    6.058556] note: kworker/u16:1[66] exited with irqs disabled