linux-ext4 - Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective)

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Message-Id: <1292502095-sup-3835@think>
Date:	Thu, 16 Dec 2010 07:29:58 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Jon Nelson <jnelson@...poni.net>,
	Mike Snitzer <snitzer@...hat.com>, Matt <jackdachef@...il.com>,
	Milan Broz <mbroz@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	dm-devel <dm-devel@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	htd <htd@...cy-poultry.org>, htejun <htejun@...il.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective)

Excerpts from Dave Chinner's message of 2010-12-15 22:37:18 -0500:
> On Wed, Dec 08, 2010 at 07:20:24AM -0500, Chris Mason wrote:
> > 
> > Usually the trick to reproducing filesystem corruptions is adding memory
> > pressure.  The corruption is probably a bad interaction between reads
> > and writes, and we need to make sure the reads actually happen.
> > 
> > http://oss.oracle.com/~mason/pin_ram.c
> > 
> > gcc -Wall -o pin_ram pin_ram.c
> > 
> > pin_ram -m 80%-of-your-ram-in-mb
> 
> Implemented in xfstests about 10 years ago:
> 
> http://git.kernel.org/?p=fs/xfs/xfstests-dev.git;a=blob;f=src/usemem.c;h=b8794a6b209cebf8dbf312a8ef131e2e54b18d29;hb=HEAD

But mine can use shm! I don't remember adding it, so it must have grown
there while it sat on the oracle servers.  Our own special Christmas
magic.

-chris
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