linux-ext4 - Re: 2.6.23-rc6: hanging ext3 dbench tests

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Date:	Mon, 24 Sep 2007 11:01:58 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Andy Whitcroft <apw@...dowen.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, sct@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	adilger@...sterfs.com, ext4 <linux-ext4@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, mel@....ul.ie
Subject: Re: 2.6.23-rc6: hanging ext3 dbench tests

Hi Andy,

I managed to reproduce the dbench problem. (not sure if its the same
thing or not - but symptoms are same). My problem has nothing to do 
with ext3. I can produce it on ext2, jfs also.

Whats happening on my machine is ..

dbench forks of 4 children and sends them a signal to start the work.
3 out of 4 children gets the signal and does the work. One of the child
never gets the signal so, it waits forever in pause(). So, parent waits
for a longtime to kill it.

BTW, I was trying to find out when this problem started showing up.
So far, I managed to track it to 2.6.23-rc4. (2.6.23-rc3 doesn't seem
to have this problem). I am going to do bi-sect and find out which
patch caused this.

I am using dbench-2.0 which consistently reproduces the problem on
my x86-64 box. Did you find anything new with your setup ?

Thanks,
Badari

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