Date: Sat, 5 Jun 2004 15:08:17 +0800 (CST) From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw> To: Don Lewis <truckman@FreeBSD.org> Cc: dl@leo.org Subject: Re: LOR No 9 and strange other kernel messages Message-ID: <0406051457071.70177@www.mmlab.cse.yzu.edu.tw> In-Reply-To: <200406050514.i555EPJM004758@gw.catspoiler.org> References: <200406050514.i555EPJM004758@gw.catspoiler.org>
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On Fri, 4 Jun 2004, Don Lewis wrote: > On 4 Jun, Tai-hwa Liang wrote: > > On Fri, 4 Jun 2004, Daniel Lang wrote: > >> Hi, > >> > >> I just went through my syslog and stumbled across a LOR, which is > >> documented on the Zabbadoz LOR page (id 009). > >> > >> The reason for this mail is the following kernel messages: > >> > >> [..] > >> Jun 1 11:08:06 atrbg11 kernel: x: 2 > >> Jun 1 11:08:06 atrbg11 kernel: x: 2 > >> [..] > >> > >> Seems some leftovers from a developer who did not want to > >> bother others with the gory details. ;-)) > > > > I guess that came from sys/dev/sound/pcm/sound.c:872. My Thinkpad T40 also > > ran into this when the disk/network(combination) load is high enough. > > Looks likely, but I'd expect this would only get triggered when sysctl > is used to set or query the number of vchans. In any case, this marks > another spot where locking is broken in the sound code. I use the default setting without tweaking any vchan related sysctl such like hw.snd.pcm0.vchans(leave it to default 0) or hw.snd.maxautovchans (also left to 0 on my T40). I'm wondering about whether this "bug" is ACPI related(interrupt storm?) since recently when I run "make buildworld buildkernel" on one terminal and do large file transmission(FTP ISO images on using em0) at the same time, the sound tends to become "broken." Meanwhile, the "x: 2" message popped on my console and later on my em0 doesn't work anymore(I have to do a reboot to get it back; however, the other part of the system still works while em0 was dead: sound continue playing, can compile/edit programs).
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