Date: Tue, 20 Jul 2010 15:59:45 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-stable@freebsd.org Cc: Markus Gebert <markus.gebert@hostpoint.ch> Subject: Re: 8.1-RC2 MCE caused by some LAPIC/clock changes? (was: 8.1-RC2 - PCI fatal error or MCE triggered by USB/ehci on Sun X4100M2?) Message-ID: <201007201559.45081.jhb@freebsd.org> In-Reply-To: <F744F475-3D2B-4BC6-856A-A5D302AA8681@hostpoint.ch> References: <6B57591F-9FA2-45EB-825F-1DB025C0635D@hostpoint.ch> <9DCFE2F6-D7CB-49CB-8EBC-06C1E5EBB727@hostpoint.ch> <F744F475-3D2B-4BC6-856A-A5D302AA8681@hostpoint.ch>
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On Saturday, July 17, 2010 2:35:21 pm Markus Gebert wrote: > > On 13.07.2010, at 16:02, Markus Gebert wrote: > > > Unfortunately, I have not been able to get anything useful out the svn commit logs, which could explain this. Maybe someone else has an idea what could have changed between 7 and 8 to break it, and again between 8 and CURRENT to magically fix it again. > > I tracked this down further. I couldn't easily downgrade my 8.1 installation to see when the problem was introduced because the zpool version used is 14. So I tried to figure out, when the problem was solved in CURRENT. > > I started with the first possible revision that can boot off my v14 pool (r201143, Dec 28, zfs v14 commit). With this revision, I was able to trigger the MCE. > > Then I took some later revision (rev206010, Apr 1, chosen randomly), and I couldn't reproduce the problem. I started narrowing the revisions down until I found out, that while on r202386 I'm still able to trigger the MCE, r202387 seems to solve the problem on CURRENT: > > http://svn.freebsd.org/viewvc/base?view=revision&revision=202387 Although this change was MFC'd, it was later disabled by default because it causes issues on other machines. I think there is a tunable you need to set in loader.conf to enable it for 8.1. Attilio (the author of that commit) should know which tunable to set. -- John Baldwin
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