Date: Mon, 23 Feb 2004 22:07:09 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: b_oshea@yahoo.com Cc: mat@cnd.mcgill.ca Subject: Re: 5.2.1-RC hangs occasionally when sound files are played using the pcm driver Message-ID: <200402240607.i1O6797E073003@gw.catspoiler.org> In-Reply-To: <20040224025537.18179.qmail@web10503.mail.yahoo.com>
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On 23 Feb, Brian O'Shea wrote: > --- Brian O'Shea <b_oshea@yahoo.com> wrote: >> --- Mathew Kanner <mat@cnd.mcgill.ca> wrote: >> > >> > Hello Brian, >> > Don Lewis commited changes to the 5.2- tree on 2/14. Could >> > you update and try again, also please do run with witness and >> > invariants, and if possible try to get a crashdump so we can see >> > what's happening. >> >> Sure. I'll try to reproduce it with witness and invariants first, just >> to avoid changing too many conditions at the same time. Failing that, >> I'll update to the latest 5.2 tree and see if the problem goes away. > > makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols > options INVARIANTS #Enable calls of extra sanity checking > options INVARIANT_SUPPORT #Extra sanity checks of internal > structures, required by INVARIANTS > options WITNESS #Enable checks to detect deadlocks and > cycles > #options WITNESS_SKIPSPIN #Don't run witness on spinlocks for > speed > > Ok, the problem seems to happen much more reliably now, but still no > panic (so no crash dump). However, I did notice that for some reason > I had built an SMP kernel. All kernels that I have seen exhibit this pcm > driver hang were apparently SMP kernels...I guess that's the default > in GENERIC, which I copied and adapted for my kernel config. As my system > only has one CPU, I will build a UP kernel and see if that has any > effect. Witness won't trigger a panic. It just prints some information to the console about the error. SMP is now the default and runs fine on UP boxes.
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