Date: Wed, 30 Apr 2003 16:33:21 +0200 From: Jan-Espen Pettersen <sigsegv@leakingmemory.org> To: Georg Funk <georgfunk@web.de> Cc: freebsd-current@freebsd.org Subject: Re: lock order reversal Message-ID: <200304301633.21927.sigsegv@leakingmemory.org> In-Reply-To: <200304301455.23334.georgfunk@web.de> References: <200304301455.23334.georgfunk@web.de>
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On Wednesday 30 April 2003 14:55, Georg Funk wrote: > Hi! > I'm running the FreeBSD 5.0-RELEASE. When I boot up, this appears: > > 1st 0xc12a7230 process lock (process lock) @ > ../../../kern/kern_descrip.c:2112 lock order reversal > I haven't noticed any disfunctions, but what does this mean? > > I get a similar error when I use my soundcard: > > lock order reversal > 1st 0xc120a680 pcm0 (sound softc) @ ../../../dev/sound/isa/mss.c:177 > 2nd 0xc120a740 pcm0:play:0 (pcm channel) @ > ../../../dev/sound/pcm/channel.c:441 > > I have to restart the KDE artsd before the soundcard works correct. Please > give me advice how to solve this. > > Thanks in advance, Georg Funk I have also seen that problem, and this patch seems to work here.. It is probably not very optimized, but the lock order reversal didn't show up again... cvs diff: Diffing sys/dev/sound/pcm Index: sys/dev/sound/pcm/dsp.c =================================================================== RCS file: /old/pub/FreeBSD/development/FreeBSD-CVS/src/sys/dev/sound/pcm/dsp.c,v retrieving revision 1.62 diff -r1.62 dsp.c 265,266c265 < pcm_unlock(d); < /* finished with snddev, new channels still locked */ --- > /* keep the snddev lock to avoid a lock order reversal, new channels still locked */ 271d269 < pcm_lock(d); 289d286 < pcm_lock(d); 306a304 > pcm_unlock(d); Regards, Jan-Espen Pettersen
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