linux-kernel - Re: [BUG] general protection fault when connecting an old mp3/usb device

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Message-ID: <2899b7cb-106b-48dc-890f-9cc80f1d1f8b@acm.org>
Date: Tue, 19 Aug 2025 12:20:51 -0700
From: Bart Van Assche <bvanassche@....org>
To: phil@...lpotter.co.uk
Cc: David Wang <00107082@....com>, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, James.Bottomley@...senPartnership.com,
 martin.petersen@...cle.com
Subject: Re: [BUG] general protection fault when connecting an old mp3/usb
 device

On 8/18/25 2:50 AM, David Wang wrote:
> [Sat Aug 23 03:56:09 2025] Oops: general protection fault, probably for non-canonical address 0x2e2e2f2e2e2f308e: 0000 [#1] SMP NOPTI
> [Sat Aug 23 03:56:09 2025] Call Trace:
> [Sat Aug 23 03:56:09 2025]  <TASK>
> [Sat Aug 23 03:56:09 2025]  sr_do_ioctl+0x5b/0x1c0 [sr_mod]
> [Sat Aug 23 03:56:09 2025]  sr_packet+0x2c/0x50 [sr_mod]
> [Sat Aug 23 03:56:09 2025]  cdrom_get_disc_info+0x60/0xe0 [cdrom]
> [Sat Aug 23 03:56:09 2025]  cdrom_mrw_exit+0x29/0xb0 [cdrom]
> [Sat Aug 23 03:56:09 2025]  ? xa_destroy+0xaa/0x120
> [Sat Aug 23 03:56:09 2025]  unregister_cdrom+0x76/0xc0 [cdrom]
> [Sat Aug 23 03:56:09 2025]  sr_free_disk+0x44/0x50 [sr_mod]
> [Sat Aug 23 03:56:09 2025]  disk_release+0xb0/0xe0
> [Sat Aug 23 03:56:09 2025]  device_release+0x37/0x90
> [Sat Aug 23 03:56:09 2025]  kobject_put+0x8e/0x1d0
> [Sat Aug 23 03:56:09 2025]  blkdev_release+0x11/0x20
> [Sat Aug 23 03:56:09 2025]  __fput+0xe3/0x2a0
> [Sat Aug 23 03:56:09 2025]  task_work_run+0x59/0x90
> [Sat Aug 23 03:56:09 2025]  exit_to_user_mode_loop+0xd6/0xe0
> [Sat Aug 23 03:56:09 2025]  do_syscall_64+0x1c1/0x1e0
> [Sat Aug 23 03:56:09 2025]  entry_SYSCALL_64_after_hwframe+0x76/0x7e

Phillip, is this behavior perhaps introduced by commit 5ec9d26b78c4
("cdrom: Call cdrom_mrw_exit from cdrom_release function")? Please do
not call code that invokes ioctls from the disk_release() callback.

Thanks,

Bart.