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Date:      Wed, 07 Nov 2007 14:16:11 -0500
From:      Joe Marcus Clarke <marcus@FreeBSD.org>
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:  <47320EFB.7040304@FreeBSD.org>
In-Reply-To: <1194457019.35649.82.camel@opus.cse.buffalo.edu>
References:  <200710131857.46963.pieter@degoeje.nl>	<200710140408.46121.pieter@degoeje.nl> <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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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 running unpatched for a while now with multiple GNOME 2.20
TB builds running, and I have not seen this panic.  It's probably been
three weeks now.

Joe

- --
Joe Marcus Clarke
FreeBSD GNOME Team	::	gnome@FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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