Date: Thu, 8 Nov 2007 19:30:27 +0100 From: Peter Holm <peter@holm.cc> To: Ken Smith <kensmith@cse.Buffalo.EDU> Cc: Tim Bishop <tim-lists@bishnet.net>, freebsd-current@freebsd.org, avleeuwen@piwebs.com, Rolf Witt <fbsd-st@donut.de>, Kostik Belousov <kostikbel@gmail.com>, Pieter de Goeje <pieter@degoeje.nl> Subject: Re: panic: ffs_blkfree: freeing free block Message-ID: <20071108183027.GA32851@peter.osted.lan> In-Reply-To: <1194457019.35649.82.camel@opus.cse.buffalo.edu> References: <471427BE.10500@freebsd.org> <d86b48730710160320i4edd98b9v94e451c1e5f6531b@mail.gmail.com> <20071016112907.GD6511@deviant.kiev.zoral.com.ua> <4715FAA7.7030404@freebsd.org> <20071018093948.GN6511@deviant.kiev.zoral.com.ua> <d86b48730710180259u4dccccdcx245bc333c41258e3@mail.gmail.com> <d86b48730710180940h4f29cdden3c48c23a75328819@mail.gmail.com> <20071019091249.GI88271@carrick.bishnet.net> <d86b48730710230235y78865ed4nd2849ed3f01a92d5@mail.gmail.com> <1194457019.35649.82.camel@opus.cse.buffalo.edu>
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On Wed, Nov 07, 2007 at 12:36:59PM -0500, Ken Smith wrote: > On Tue, 2007-10-23 at 11:35 +0200, Arjan van Leeuwen wrote: > > 2007/10/19, Tim Bishop <tim-lists@bishnet.net>: > > > > > > On Thu, Oct 18, 2007 at 06:40:04PM +0200, Arjan van Leeuwen wrote: > > > > > are softupdates on ? > > > > > > > > > > Yes. Turning them off seems to fix the problem (fingers crossed - I > > > only > > > > > turned it off this morning, didn't have a panic yet) > > > > > > > > After working for a whole day without softupdates, I can say that > > > turning > > > > them off at least causes less panics to happen than with them turned on, > > > > maybe they even don't happen at all without softupdates; I haven't had a > > > > panic all day, while I have one every few hours with softupdates turned > > > on. > > > > > > I've been running for the best part of a day now with softupdates turned > > > off and so far no panics. I'm running tinderbox on the host, and it > > > would quite reliably crash it before. > > > > > > Of course it's hard to say if this has fixed the problem... maybe it > > > doesn't happen as often, or maybe my data is being slowly chewed up > > > instead ;-) > > > > It looks like on the same system, I'm able to reliably panic zfs as well, > > under the exact same conditions (i.e. linking a particularly big piece of > > software). Maybe this is not a problem in the filesystem at all. I've not > > been able to get a coredump yet from the zfs panic. > > This is in 7.0-PRERELEASE, btw (I switched to RELENG_7 when the branching > > happened). > > Is anyone who had been able to trigger this panic still having problems > with recent kernels (and soft updates turned on)? I've checked with a > few people who had been experiencing the panic and they can no longer > trigger it. > > It's at least a tiny bit possible some of the VM fixes that have gone in > addressed this problem. We'd like to find out if anyone can still > trigger this. > I have been hunting this problem for a while, but not been able to reproduce it lately. -- Peter Holm
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