Date: Mon, 28 Apr 2003 18:09:38 -0700 From: "Cliff L. Biffle" <cbiffle@safety.net> To: current@freebsd.org Subject: Re: vchans seem to affect /dev/dsp* availability Message-ID: <200304281809.38091.cbiffle@safety.net> In-Reply-To: <200304271730.53960.cbiffle@safety.net> References: <200304271730.53960.cbiffle@safety.net>
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On Sunday 27 April 2003 05:30 pm, Cliff L. Biffle wrote: > When I have vchans enabled, every few attempts at opening /dev/dsp* result > in 'Operation not supported by device.' Also, while they're enabled, some > programs (most reproduceably artsd) peg my CPU after outputting sound data > in certain situations. I've had a few people report that they get this issue even with vchans enabled, and I can confirm this. After a kernel rebuild with some debugging switches, I'm now getting a lock order reversal message that seems to coincide with the dsp breakage. Here's the messages, if anyone can make sense of 'em. :-) -Cliff L. Biffle --- lock order reversal 1st 0xc1dea840 pcm0:play:0 (pcm channel) @ /usr/src/sys/dev/sound/pcm/sound.c:191 2nd 0xc1dea9c0 pcm0 (sound cdev) @ /usr/src/sys/dev/sound/pcm/sound.c:163 Stack backtrace: lock order reversal 1st 0xc1cbb9c0 pcm0:play:0 (pcm channel) @ /usr/src/sys/dev/sound/pcm/sound.c:191 2nd 0xc21aab40 pcm0 (sound cdev) @ /usr/src/sys/dev/sound/pcm/sound.c:163 Stack backtrace:
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