From mboxrd@z Thu Jan  1 00:00:00 1970
From: Justin Piszcz <jpiszcz@lucidpixels.com>
Subject: if (stripe_cache_size =< chunk_size) { BUG() }
Date: Tue, 26 Jun 2007 07:20:00 -0400 (EDT)
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If you set the stripe_cache_size less than or equal to the chunk size of 
the SW RAID5 array, the processes will hang in D-state indefinitely until 
you change the stripe_cache_size to > chunk_size.

Tested with 2.6.22-rc6 and a 128 KiB RAID5 Chunk Size, when I set it to 
256 KiB, no problems.  128 KiB and below cause issues.

Justin.