From: Lennart Poettering <mznyfn@0pointer.de>
To: ALSA Development Mailing List <alsa-devel@alsa-project.org>
Subject: Something wrong with snd_pcm_avail_update
Date: Wed, 24 Sep 2008 02:19:54 +0200 [thread overview]
Message-ID: <20080924001954.GA5422@tango.0pointer.de> (raw)
Heya!
There seems to be something wrong with snd_pcm_update_avail() for mmap
in recent 2.6.26 kernels:
Quoting Alexander Gavrilov:
<snip>
Fedora 9 with kernel 2.6.26.3-29 exhibits a bug where
the driver decrements its hw.ptr under certain stress
conditions, or at least it appears so from debugging.
It causes alsa-lib to give absurdly huge avail numbers
to pulseaudio, which crashes it. This patch adds a
work-around to avoid such unfriendly behavior until
the bug is fixed.
As this is not a real fix, it displays a message every
time it is activated.
</snip>
https://bugzilla.redhat.com/show_bug.cgi?id=462200
(see the patch attached to that bug report)
Takashi, Jaroslav, do you know anything about this?
Lennart
--
Lennart Poettering Red Hat, Inc.
lennart [at] poettering [dot] net ICQ# 11060553
http://0pointer.net/lennart/ GnuPG 0x1A015CC4
next reply other threads:[~2008-09-24 0:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-24 0:19 Lennart Poettering [this message]
2008-09-24 7:56 ` Something wrong with snd_pcm_avail_update Takashi Iwai
2008-09-24 8:58 ` Jaroslav Kysela
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