Date: Fri, 13 Aug 2004 15:25:11 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: Doug White <dwhite@gumbysoft.com> Cc: freebsd-current@freebsd.org Subject: Re: Deadlocks with recent SMP current Message-ID: <Pine.NEB.3.96L.1040813152348.73100I-100000@fledge.watson.org> In-Reply-To: <20040813102922.E93695@carver.gumbysoft.com>
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On Fri, 13 Aug 2004, Doug White wrote: > On Fri, 13 Aug 2004, Martin Blapp wrote: > > > Since yesterday I'm getting complete deadlocks. This time unrelated > > the servers are nor loaded at all, the just freeze after a while. > > No break into DDB possible at all. > > Welcome to the club; I've been having them on my -curent builder since > Aug 4. I'm going to set up a duplicate box and start binary-searching > for the offending commit(s). > > Preemption is the default, disabled. > > My box is a dual-600MHz P3 with 1GB RAM and running kde. A make -j3 > buildworld will lock it up 75% of the time. It'll survive a nonparallel > build, and it'll survive a kernel build. > > Haven't tried WITNESS+INVARIANTS yet since it really dogs the machine. > :) If I leave SMP boxes running large parallel kernel builds overnight, I will eventually get a solid hang. I tried it on a new SMP box with an NMI button I received yesterday but was unable to get into the debugger. I'm in the process of de-obfuscating the NMI path to increase the chances of successfully getting into the debugger and then I'll try again to see what I can figure out. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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