Messages in this thread | | | Date | Wed, 5 Apr 2006 11:01:17 +0200 | From | Jan Niehusmann <> | Subject | Re: [Alsa-devel] Slab corruptions & Re: 2.6.17-rc1: Oops in sound applications |
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On Wed, Apr 05, 2006 at 02:28:47AM +0200, Jan Niehusmann wrote: > If I now add the patch you suggested, correcting the check in > snd_pcm_oss_open_file(), accessing /dev/dsp instead leads to EINVAL. > > So I guess git bisect really lead me to this already known bug.
And another update. Sorry for sending so many small mails, but I want to keep you informed to avoid unnecessary duplication of work.
To make sure I didn't do something stupid like confusing kernel versions, I retried with 2.6.17-rc1 and the mentioned patch. It oopses again, but the behaviour is different:
Versions 2.6.16 to commit bf1bbb5a49eec51c30d341606885507b501b37e8 only allow a single open of /dev/dsp, and do not oops.
Commit 3bf75f9b90c981f18f27a0d35a44f488ab68c8ea and later do oops with commands as simple as 'yes >/dev/dsp'.
Commit 3bf75f9b90c981f18f27a0d35a44f488ab68c8ea with the patch to snd_pcm_oss_open_file() applied do not oops, but block every access to /dev/dsp with EINVAL.
2.6.17-rc1 with the patch to snd_pcm_oss_open_file(), again, allows opening of /dev/dsp, 'yes >/dev/dsp' does work as expected, but for example twinkle (a VoIP application) gives garbled sound. Additionally, I am now able to open /dev/dsp a second time (eg. 'yes >/dev/dsp' while twinkle uses the sound device), immediately leading to an oops.
My guess is that this bug is just not triggered in commit 3bf75f9b90c981f18f27a0d35a44f488ab68c8ea because, for some other reason, /dev/dsp is completely unusable.
Jan
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