Re: 2.6.23-rc6: hanging ext3 dbench tests

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To: Andy Whitcroft <apw@...>
Cc: Linus Torvalds <torvalds@...>, <sct@...>, Andrew Morton <akpm@...>, <adilger@...>, ext4 <linux-ext4@...>, lkml <linux-kernel@...>, <mel@...>
Date: Monday, September 24, 2007 - 2:01 pm

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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Messages in current thread:
2.6.23-rc6: hanging ext3 dbench tests, Andy Whitcroft, (Tue Sep 11, 8:42 am)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Linus Torvalds, (Tue Sep 11, 12:58 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Andy Whitcroft, (Tue Sep 11, 1:30 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Andy Whitcroft, (Fri Sep 14, 5:49 am)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Andy Whitcroft, (Wed Sep 19, 2:15 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Badari Pulavarty, (Mon Sep 24, 2:01 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Linus Torvalds, (Mon Sep 24, 4:04 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Badari Pulavarty, (Mon Sep 24, 8:28 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Badari Pulavarty, (Mon Sep 24, 5:20 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Andrew Morton, (Mon Sep 24, 3:12 pm)
Re: 2.6.23-rc6: hanging ext3 dbench tests, Jan Kara, (Tue Sep 11, 12:55 pm)