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

[Liu Bo <bo.li.liu@oracle.com>]

On Tue, Jan 22, 2013 at 09:39:02AM -0500, Chris Mason wrote:
> 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.

After this patch(Btrfs: put csums on the right ordered extent),
I'm unable to get crc errors by running this script.

thanks,
liubo

> 
> #!/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
> --
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