Date: Wed, 28 Jan 2004 23:14:34 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: emoe@cox.net Cc: jhb@FreeBSD.org Subject: Re: 5.2-RELEASE panic in turnstile_wait Message-ID: <200401290714.i0T7EY7E085897@gw.catspoiler.org> In-Reply-To: <IJEJIDFLPIJEPPAPEIHCCEDBCEAA.emoe@cox.net>
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On 29 Jan, Erik Moe wrote: > My loader.conf looks like this... > > hw.pci.allow_unsupported_io_range="1" > hw.ata.atapi_dma="1" > > hw.snd.pcm0.vchans=4 > hw.snd.maxautovchans=4 There is a potential buffer overflow in the vchan code that can bzero() unrelated objects in the kernel heap, like the mutex that you found, and cause hard to track down system panics. The buffer overflow can be triggered by certain combinations of sound hardware and software. The 5.2-RELEASE errata list contains the following note: (9 Jan 2004) The use of multiple vchans (virtual audio channels with dynamic mixing in software) in the pcm(4) driver has been known to cause some instability. I finally came up with a fix for this problem that worked and checked it into the -CURRENT source within the last 24 hours. I'd recommend either disabling vchans or upgrading to -CURRENT, though you might be able to retrofit the contents of src/sys/dev/sound/pcm/ and rebuild your kernel.
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