request for linux readahead bug testing

[Andre Robatino <andre@xxxxxxxxxxxxxxx>]

 If anyone out there has experienced mediacheck failures with Red Hat 
or Fedora discs in the past, and still has both the discs in question 
and a F8 or rawhide box using the same CD or DVD drive that was being 
used when doing the mediacheck, could you run the following test?  Use 
the rawread script from

http://www.troubleshooters.com/linux/coasterless.htm

to read off the contents of the disc ISO as follows:

./rawread /dev/cdrom > disc.iso

If repeated read errors are experienced, stop it with Ctrl-C and check 
the size of disc.iso.  If the file is short of the expected size by less 
than about 150 KB, this indicates that the read error is probably caused 
by the readahead bug (wget -c can be used to download the remaining part 
of the file from download.fedora.redhat.com, and sha1sum can be used to 
verify that the resulting file is correct).  Any reports, either 
positive or negative, would be appreciated.  Both I and my father are 
using identical DVD drives (Sony DRU-120C) in different machines, and 
experience the readahead bug in F8.  Whether the bug manifests depends 
both on which kernel is being run, and on which CD/DVD drive is being 
used.  Zero-padding the disc while burning prevents the bug from 
manifesting.  I've reported the problem at

https://bugzilla.redhat.com/show_bug.cgi?id=397141

but so far there have been no corroborating reports.

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