linux-kernel - Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt

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Message-ID: <47C979EF.7070906@wpkg.org>
Date:	Sat, 01 Mar 2008 16:44:47 +0100
From:	Tomasz Chmielewski <mangoo@...g.org>
To:	dm-devel@...hat.com, LKML <linux-kernel@...r.kernel.org>,
	agk@...hat.com, herbert@...dor.apana.org.au,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt

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
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