request for linux readahead bug testing
Andre Robatino
andre at bwh.harvard.edu
Mon Feb 4 18:17:36 UTC 2008
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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