Message-ID: <47C979EF.7070906@wpkg.org>
Date: Sat, 01 Mar 2008 16:44:47 +0100
From: Tomasz Chmielewski <mangoo@wpkg.org>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061110 Mandriva/1.5.0.8-1mdv2007.1 (2007.1) Thunderbird/1.5.0.8 Mnenhy/0.7.4.666
MIME-Version: 1.0
To: dm-devel@redhat.com, LKML <linux-kernel@vger.kernel.org>, agk@redhat.com,
       herbert@gondor.apana.org.au, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1378
Lines: 41

Ritesh Raj Sarraf wrote:

(...)

> Meanwhile I was able to reproduce the bug again with the same configuration 
> and the same scenario. So I believe that the bug can be reproduced 
> consistently.
> 
> Here are the steps:
> 
> 1) Initialize a device using dm-crypt and LUKS
> 2) Create a filesystem on top of it and mount it.
> 3) Write huge amount of data (as a normal user). Something like 150GB.
> 
> As the load goes hight (to something like 12-14), the kernel lock-up is logged 
> into dmesg.
> At that moment, the OS is barely responsive.

I tried to reproduce it on two machines running 2.6.24.2, with cfq 
scheduler.

One machine, with 5x HDD, RAID-5, dm-crypt/LUKS, LVM, ext3 on top of it 
all - I created a 250 GB file, the load was 4-5. No lockups or anything.
Later, removing that 250 GB file took over 7 minutes, but that's a 
different story.


Second machine, dm-crypt on a USB-connected drive, LVM, ext3 on top of 
it, X with nvidia binary blob (version 169.09). I created a 190 GB file, 
the load was indeed pretty high - up to about 14. But still, no lockups 
of any kind.


-- 
Tomasz Chmielewski
http://wpkg.org
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/