dd: reblock failure -- sporadic failures

[Bob Proulx]

This seems very strange.  Periodically I have seen the dd reblock test
fail.  It isn't a hard failure and that seems like a critical clue to
me.  But it also seems quite strange.

  http://buildbot.proulx.com:9000/i686-gnu-linux-full/builds/990/step-test/0

  + dd bs=3 ibs=1 obs=1
  ...
  + diff -u err exp-no-reblock
  --- err         2008-11-29 07:07:22.000000000 -0700
  +++ exp-no-reblock   2008-11-29 07:07:21.000000000 -0700
  @@ -1,3 +1,3 @@
  -1+1 records in
  -1+1 records out
  +0+2 records in
  +0+2 records out
   4 bytes (4 B) copied
  + fail=1

Bob