Bug 210748 – sys-kernel/gentoo-sources-2.6.24-r2: crash when disconnecting usb sound device

• Status: RESOLVED OBSOLETE
• Product: Gentoo Linux

[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 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) 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) 2008-02-24 23:11:51 UTC]

will continue on upstream bug