From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 26 Oct 2010 18:27:22 +0200 From: Lucio De Re To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Message-ID: <20101026162722.GA4059@fangle.proxima.alt.za> References: <20101024122035.GB14331@fangle.proxima.alt.za> <6701519c3b154bfb8462542b787fbae5@coraid.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Subject: Re: [9fans] lock diagnostics on Fossil server Topicbox-Message-UUID: 6e03f6ae-ead6-11e9-9d60-3106f5b1d025 On Tue, Oct 26, 2010 at 07:28:57AM -0700, Russ Cox wrote: > > Like Lucio and Cinap, I am skeptical that this is the fix. > > It's a real bug and a correct fix, as we've discussed before, > but if the kernel loses this race I believe it will crash dereferencing nil. > Lucio showed a kernel that was very much still running. > And a very busy one, at that, because while I had stats(1) running, it showed load at max. I may not remember correctly, but I think there lots of context switches as well, but load was saturating. I can re-create the problem if anybody wants me to help diagnose it. ++L