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

[Chris Mason]

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