Date: Tue, 28 Sep 2004 11:42:09 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Brian Fundakowski Feldman <green@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: panic: APIC: Previous IPI is stuck Message-ID: <200409281142.09481.jhb@FreeBSD.org> In-Reply-To: <20040927215511.GC24003@green.homeunix.org> References: <20040924230425.GB1164@green.homeunix.org> <200409271635.44017.jhb@FreeBSD.org> <20040927215511.GC24003@green.homeunix.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Monday 27 September 2004 05:55 pm, Brian Fundakowski Feldman wrote: > On Mon, Sep 27, 2004 at 04:35:44PM -0400, John Baldwin wrote: > > On Friday 24 September 2004 08:24 pm, Andy Farkas wrote: > > > I have been having this problem for a few weeks now. Glad I'm not the > > > only one. My box is a 4xPPro running 5.3-BETA5. It panics with either > > > ULE or 4BSD. > > > > > > My theory is that a physical IPI gets lost somewhere and the kerenl > > > spins waiting for it. But thats just a stab in the dark because nobody > > > cares to explain why IPI's would be stuck. > > > > The panic has to do with a previous IPI not finished being sent from the > > same CPU. I've yet to determine why this happens. You can try editing > > sys/i386/i386/local_apic.c and turning on 'DETECT_DEADLOCK' (I think it > > is just commented out) and seeing if that improves stability. I also see > > this on a 4xPIIXeon system I use for testing. > > Can KTR logging be leveraged to find the root cause(s) of these deadlocks, > or is it just so wildly unpredictable that it would be of no use? It might could be, but I think it would probably slow things down so much that they would go away. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200409281142.09481.jhb>