Bug#294691: kernel-image-2.6.8-1-686-smp: DVD Burner fails to function after burning a CD-R

[Horms <horms@debian.org>]

On Fri, Feb 11, 2005 at 12:29:09AM -0500, Shawn M. Jones wrote:
> Package: kernel-image-2.6.8-1-686-smp
> Version: 2.6.8-10
> Severity: normal
> 
> 
> At some point recently, my DVD Burner failed to return md5sums from
> recently created discs.  As this was an inexpensive small-name brand
> device, I assumed that it had merely quit functioning and picked up a
> Pioneer DVR-109 as a replacement.
> 
> That too, does not function.
> 
> I can do an MD5 sum on a disc if I do not burn any CDs from that drive,
> but once I burn a CD, reading from the drive becomes... problematic.
> The drive is mountable and its contents are readable, but the md5sum
> program returns the same md5sum each time, no matter what disc, no
> matter what iso image.  Also, mounting CDs afterwards may or may not
> work.
> 
> Switching to the kernel-image-2.6.10-1-686-smp from sid has no effect on the
> problem.
> 
> Switching to the 2.6.9 kernel used with Knoppix 3.7 appears to fix the
> problem if I have both drives plugged in at the same time.
> 
> This is really odd.
> 
> I'm going to do a fresh install of Sarge soon to see if this solves the
> problem.

There was a a security fix to iotls for DVD devides a few months back,
which basically now requires safe ioctls to be whitelisted,
and this whitelist is still in the process of evolving.

Here are some things to try.
   1. Running your commands as root. Its a work around, but it should
      identify the whitelist as the problem.
   2. 2.6.8-13, this contains some fixes
   3. 2.6.8-14 from SVN, I can make a snapshot available if that helps.

-- 
Horms