Re: 2.6.23-rc6: hanging ext3 dbench tests

From: Badari Pulavarty
Date: Mon Sep 24 2007 - 13:59:51 EST

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 ?


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