[    2.060058] gre: GRE over IPv4 demultiplexer driver
[    2.214764] ip_gre: GRE over IPv4 tunneling driver
[    2.462629] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.462708] #PF: supervisor write access in kernel mode
[    2.462750] #PF: error_code(0x0002) - not-present page
[    2.462793] PGD 0 P4D 0 
[    2.462822] Oops: Oops: 0002 [#1] SMP
[    2.462862] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.462944] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.463002] Workqueue: netns cleanup_net
[    2.463047] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.463101] 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
[    2.463258] RSP: 0018:ffff9f664024fc30 EFLAGS: 00010046
[    2.463303] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000004
[    2.463371] RDX: ffff9f664024fc68 RSI: 0000000000000000 RDI: 0000000000000000
[    2.463439] RBP: ffff9f664024fc68 R08: 0000000000000400 R09: 0000000000000001
[    2.463506] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[    2.463574] R13: ffff9f664024fd60 R14: 0000000000000020 R15: ffff9f664024fdf0
[    2.463645] FS:  0000000000000000(0000) GS:ffff89af30591000(0000) knlGS:0000000000000000
[    2.463724] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.463786] CR2: 0000000000000000 CR3: 0000000006c46001 CR4: 0000000000772ef0
[    2.463856] PKRU: 55555554
[    2.463877] Call Trace:
[    2.463902]  <TASK>
[    2.463932]  __cancel_work+0x29/0xe0
[    2.463971]  ? dev_deactivate_many+0x2c9/0x300
[    2.464023]  __cancel_work_sync+0x16/0x80
[    2.464063]  __dev_close_many+0x113/0x2b0
[    2.464104]  netif_close_many+0x98/0x160
[    2.464138]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.464191]  ? rtnl_is_locked+0x15/0x20
[    2.464232]  ops_undo_list+0x1de/0x1f0
[    2.464272]  cleanup_net+0x1b7/0x300
[    2.464305]  process_one_work+0x162/0x380
[    2.464347]  worker_thread+0x299/0x3c0
[    2.464387]  ? rescuer_thread+0x4c0/0x4c0
[    2.464426]  kthread+0x101/0x1f0
[    2.464466]  ? kthreads_online_cpu+0x110/0x110
[    2.464512]  ? kthreads_online_cpu+0x110/0x110
[    2.464563]  ret_from_fork+0x11c/0x140
[    2.464605]  ? kthreads_online_cpu+0x110/0x110
[    2.464656]  ret_from_fork_asm+0x11/0x20
[    2.464692]  </TASK>
[    2.464713] Modules linked in: ip_gre gre
[    2.464754] CR2: 0000000000000000
[    2.464787] ---[ end trace 0000000000000000 ]---
[    2.464832] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.464884] 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
[    2.465043] RSP: 0018:ffff9f664024fc30 EFLAGS: 00010046
[    2.465087] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000004
[    2.465152] RDX: ffff9f664024fc68 RSI: 0000000000000000 RDI: 0000000000000000
[    2.465221] RBP: ffff9f664024fc68 R08: 0000000000000400 R09: 0000000000000001
[    2.465289] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[    2.465356] R13: ffff9f664024fd60 R14: 0000000000000020 R15: ffff9f664024fdf0
[    2.465431] FS:  0000000000000000(0000) GS:ffff89af30591000(0000) knlGS:0000000000000000
[    2.465505] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.465568] CR2: 0000000000000000 CR3: 0000000006c46001 CR4: 0000000000772ef0
[    2.465638] PKRU: 55555554
[    2.465659] note: kworker/u16:1[66] exited with irqs disabled

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