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List:       dragonfly-bugs
Subject:    [DragonFlyBSD - Bug #2554] panic: chn_wrfeed(pcm0:play:2:dsp0.2): amt 4096 > source size 0, flags 0x
From:       Francis GUDIN via Redmine <bugtracker-admin () leaf ! dragonflybsd ! org>
Date:       2013-05-03 17:35:13
Message-ID: redmine.journal-11494.20130503103513 () leaf ! dragonflybsd ! org
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Issue #2554 has been updated by fgudin.


Upload done: ~crash/*28*
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Bug #2554: panic: chn_wrfeed(pcm0:play:2:dsp0.2): amt 4096 > source size 0, flags 0x0
http://bugs.dragonflybsd.org/issues/2554

Author: fgudin
Status: New
Priority: Low
Assignee: 
Category: 
Target version: 


Hello,
I've been suffering from this for quite some time (couldn't pinpoint the exact moment \
it appeared): while playing an .avi with mplayer, the machine would dump and reboot \
(dump and all will be uploading to leaf in a moment). This is a small box (VIA CPU) \
where everything is done in software (no DRM, etc.): I suspect that for some reason \
mplayer doesn't keep up filling data to the sound driver buffer, and at the wrong \
time, the kernel attempts to feed the hw channel, and boom. The attached patch seems \
to cure (I forgot it during my update to the 3.4 branch, and this morning it stroke \
back again). However, I'm neither certain my analysis is correct, nor that's the \
proper fix. Could anybody glance at it and provide advice, please ?

Thank you,
-- 
Francis



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