linux-kernel - Re: 2.6.39, 3.0.0-rc7+: complete system freeze with rsync on big directory

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Date:	Thu, 21 Jul 2011 11:28:04 +0200
From:	Lars Täuber <taeuber@...w.de>
To:	Michael Brade <brade@...ormatik.uni-muenchen.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.39, 3.0.0-rc7+: complete system freeze with rsync on big
 directory

Hi Michael,

I'm just curious, because I have troubles with storage IO too.

Am Thu, 21 Jul 2011 11:19:15 +0200
Michael Brade <brade@...ormatik.uni-muenchen.de> schrieb:
> Hi,
> 
> this is perfectly reproducible: with vanilla 2.6.39.x and 3.0.0 from 
> yesterday's git my system completely freezes after a minute or so when I do
> 
>    rsync -cavSH -n /source/ /dest/
> 
> Watching htop, it freezes only after the caches are full but not
> immediately when the caches are full. No Alt-SysRq-magic is working
> anymore, nothing responds at all after the freeze. This is on tty1, no X
> server running.
> 
> Note the -n which means dry run. I also mounted both directories read-only,
> so it's not the write commands. I am using XFS on both directories, one is 
> mounted with iscsi, the other is local and encrypted with loop-aes. The 
> directory size is >20 GB, 4000-6000 files. I first noticed it when a 
> cp -a /source /dest froze the system.
> 
> When I go back to 2.6.37.6 it works fine. I didn't try 2.6.38 yet.
> 
> I am running this on a Dell Vostro, amd64, 6 GB RAM, 8x Intel Core i7 CPU Q 
> 740 @ 1.73GHz.
> 
> Any ideas how to debug this despite the freeze? Do you need my kernel
> config? Do you need any other info? Please CC me.

Could you try to capture the log via serial console?
(linux/Documentation/serial-console.txt)

What kind of disks/controller/driver do you use?



Lars
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