Re: [bug] csum mismatches and failed xfstests with 3.8-rc1 -rc4

[Chris Mason <chris.mason@fusionio.com>]

On Tue, Jan 22, 2013 at 07:26:15AM -0700, David Sterba wrote:
> On Fri, Jan 04, 2013 at 01:50:59PM +0100, David Sterba wrote:
> > I've noticed a few csum mismatch messages, and a few failed xfstests:
> 
> They're still there, we're on rc4, so I started looking for potential
> patches to revert, but tonight the test reproduced csums with these
> patches removed:

I'm able to trigger crc errors with just 50 parallel fsx O_DIRECT procs
hammering in parallel.  Trying to nail down the test case a little
better.

#!/bin/bash

num=$1

if [ "x$num" == "x" ]; then
    num=50
fi

echo "using $num procs"

for x in `seq 1 $num` ; do
    echo -n "$x "
    fsx -q xxxf$x -Z -R -W -r 4096 -w 4096 &
done
echo "waiting"
wait