Bug 210748

Summary:	sys-kernel/gentoo-sources-2.6.24-r2: crash when disconnecting usb sound device
Product:	Gentoo Linux	Reporter:	Stephan Birkl <sbp>
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED OBSOLETE
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
URL:	http://bugzilla.kernel.org/show_bug.cgi?id=9196
Whiteboard:	watch-linux-bugzilla
Package list:		Runtime testing required:	---
Attachments:	dmesg oops output

Description Stephan Birkl 2008-02-19 19:56:34 UTC

I'm using a sony usb headset (snd_usb_audio) with gentoo sources 2.6.24-r2. When i disconnected the device i noticed a kernel OOPS in dmesg which i will attach. I rebooted my machine and tried to reproduce the problem by disconnecting the device. On the first time nothing special happened, but on the second time the whole system freezed.

Reproducible: Always

Comment 1 Stephan Birkl 2008-02-19 19:57:34 UTC

Created attachment 144010 [details]
dmesg oops output

Comment 2 Mike Pagano gentoo-dev

2008-02-24 22:30:31 UTC

Is this related?

It's assigned to gregkh.

http://bugzilla.kernel.org/show_bug.cgi?id=9196

Comment 3 Daniel Drake (RETIRED) gentoo-dev

2008-02-24 23:11:16 UTC

Nice find, certainly identical.

Stephan, please do the following. It will identify the line of code causing the crash. Please post the results on the upstream bug. The following must be done on a kernel which has not been modified (i.e. no compiler or config changes) since your oops message was posted.

# emerge -n gdb
# cd /usr/src/linux
# rm sound/core/control.o
# make CONFIG_DEBUG_INFO=y sound/core/control.o
# gdb sound/core/control.o

Then at the gdb prompt:

# list *snd_ctl_dev_disconnect+0x17

Comment 4 Daniel Drake (RETIRED) gentoo-dev

2008-02-24 23:11:51 UTC

will continue on upstream bug