Re: Kernel panic, FS corruption Was: Re: Call for RAID-6 users

If you can reproduce it with ext2/3 it would make debugging simpler, 
because I understand the ext code and data structures a lot better.

This demonstrates it on ext2.  I can't seem to reproduce it with just
simple use of 'dd', but it shows up if I untar a ton of data.

This script:
- creates five 100MB "disks" through loopback
- puts them in a six-disk RAID-6 array (resulting size=400MB, degraded)
- untars about 350MB of data to the array
- runs e2fsck, which shows filesystem errors

Usage: 
- put r6ext.sh and big.tar.bz2 in a directory
- run r6ext.sh as root

Sorry for the huge files, but e2fsck didn't show any problems when I
scaled everything down by a factor of 10.  You could probably make
your own big.tar.bz2 and see the same problem, as there's nothing
special about this data.

  http://stonewall.mit.edu/~jim/r6ext.sh
  http://stonewall.mit.edu/~jim/big.tar.bz2 (77MB)

-jim