request for linux readahead bug testing
Andre Robatino
andre at bwh.harvard.edu
Thu Feb 7 01:04:52 UTC 2008
Andre Robatino wrote:
> 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.
After doing some further tests, I find that I can only reproduce the
problem with CDs, not with DVDs. So if anyone has unpadded CDs, such as
rescue CDs, and a Fedora box with a >= 2.6.23 kernel and a CD/DVD drive
that has ever had mediacheck problems in the past, could you attempt
reading them with the rawread script to see if the read fails near the
end? Thanks.
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