linux-kernel - Re: [Bug #27842] [regression?] hang with 2.6.37 on a BTRFS test machine

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Message-Id: <201102031220.46250.Martin@lichtvoll.de>
Date:	Thu, 3 Feb 2011 12:20:32 +0100
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Florian Mickler <florian@...kler.org>,
	linux-btrfs@...r.kernel.org, "Helmut Hullen" <Hullen@...nline.de>
Subject: Re: [Bug #27842] [regression?] hang with 2.6.37 on a BTRFS test machine

Added linux-btrfs and Helmut Hullen, who seemed to experience hangs on a 
T23 with BTRFS as well, to Cc.

Am Thursday 03 February 2011 schrieb Rafael J. Wysocki:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.36 and 2.6.37.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.36 and 2.6.37.  Please verify if it still should
> be listed and let the tracking team know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=27842
> Subject		: [regression?] hang with 2.6.37 on a BTRFS test machine
> Submitter	: Martin Steigerwald <Martin@...htvoll.de>
> Date		: 2011-01-23 12:06 (11 days old)
> Message-ID	: <201101231306.23069.Martin@...htvoll.de>
> References	: http://marc.info/?l=linux-kernel&m=129578445613283&w=2

Well I now tested with 2.6.36 for more than a week and I did not see any 
of such hangs upto now. The machine seems table with 2.6.36. So I think 
its really an regression of 2.6.37.

I am stuck with what to try next. Since trying to track it down to a 
specific commit appears too involved for me and its appears also quite 
laborious to get any value debug information out of the kernel - cause it 
can take days for the bug to appear -, I am inclined to either test with 
2.6.37.1 once its available or just give it a go with 2.6.38-rc3 or rc4. 
Maybe 2.6.38-rc3/4 would be the best bet, I have seen a report on the 
btrfs mailing list of 2.6.38 fixing a BTRFS hang bug that appeared with 
2.6.37. I am just not sure whether its related or not.

Re: [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of 
the same page
http://marc.info/?l=linux-btrfs&m=129623925116051&w=2

There is another thread about 2.6.37 related BTRFS hang:

flush-btrfs-1 hangs when building openwrt
http://marc.info/?l=linux-btrfs&m=129594547616298&w=2

I will add this as comment to the bug report as well.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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