Bug 55321

Summary: modprobe -r snd_hda_intel crashes the kernel
Product: Drivers Reporter: Martin Ziegler (ziegler)
Component: Sound(ALSA)Assignee: Jaroslav Kysela (perex)
Status: CLOSED CODE_FIX    
Severity: normal CC: alan, florian, tiwai
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.9.0-rc2-00333-ge204378 Subsystem:
Regression: Yes Bisected commit-id:
Attachments: config
Fix patch

Description Martin Ziegler 2013-03-16 11:16:04 UTC 
Created attachment 95501 [details]
config

This can be reproduced by

   modprobe -r snd_hda_intel ; echo -e "\a"

modprobe -r snd_hda_intel has caused problems on my Thinkpad T501 since
kernel version 3.8. But I only know now how to reproduce it reliably.
Bisecting between 3.7 and 3.8 results in 

 commit 8dbd2879e33be37adf40f747a5fb80ef1a6cd150
 Merge: b770ea5 d308ba5
 Author: Arnd Bergmann <arnd@arndb.de>
 Date:   Thu Nov 15 17:41:21 2012 +0100

    Merge branch 'omap/dt' into next/drivers

as the first bad commit.

I attach screenshots and config-3.9.0-rc2-00333-ge204378
Comment 2 Takashi Iwai 2013-03-17 09:19:30 UTC 
The bisection results looks bogus, unfortunately.

Could you give alsa-info.sh output (run with --no-upload option)?
Also, please check whether the problems persists on 3.9-rc, too.
Comment 3 Takashi Iwai 2013-03-17 09:26:46 UTC 
OK, I found the problem in the latest code.  But this shouldn't be present in 3.8.  You meant the problem is between 3.7 and 3.9?

If it was meant so, try the patch below.
Comment 4 Takashi Iwai 2013-03-17 09:27:15 UTC 
Created attachment 95641 [details]
Fix patch
Comment 5 Martin Ziegler 2013-03-17 10:00:43 UTC 
The patch fixes the problem in 3.9.0-rc2-00333-ge204378.
Thanks!

I will recheck if the bug was already in 3.8, as I thought.
Comment 6 Martin Ziegler 2013-03-17 10:38:51 UTC 
In 3.8.0 a series of unloading and loading of all snd-modules resulted
again in a crash. But I could not reproduce it  second time. So in 3.8 this
could be a different bug.
Comment 7 Florian Mickler 2013-03-24 10:21:15 UTC 
A patch referencing this bug report has been merged in Linux v3.9-rc4:

commit 31b6945a899a30f9dffa9cba8ed2e494784810a9
Author: Takashi Iwai <tiwai@suse.de>
Date:   Sun Mar 17 10:23:40 2013 +0100

    ALSA: hda - Fix missing beep detach in patch_conexant.c