problem reading DVD after starting packetwriting with empty drive

[David Meier]

Binary package hint: linux-source-2.6.22

Some symptoms are similar to https://bugs.launchpad.net/bugs/118330, https://bugs.launchpad.net/bugs/58018, https://bugs.launchpad.net/bugs/42023 and https://bugs.launchpad.net/bugs/152547

Under some circumstances, it is impossible to read the complete content of a DVD. Only the beginning is accessible, everithing beyond a certain point is not.

dmesg reports something like
[ 271.520000] attempt to access beyond end of device
[ 271.520000] sr0: rw=0, want=7097048, limit=2097151
[ 271.520000] Buffer I/O error on device sr0, logical block 1774261

Ways to reproduce
Configure Packetwriting for the DVD-drive in /etc/default/udftools and then either
1. Boot with empty DVD drive. Insert and mount DVD.
or 2. Stop udftools; rmmod pktcdvd sr-mod; reload modules and restart udftools with empty drive, insert DVD

How to make it work again
Stop udftools; rmmod pktcdvd sr-mod; insert DVD (does not have to remain in the drive); reload modules and restart udftools
Just restarting udftools does not work, both pktcdvd and sr-mod need to be reloaded.

Additional information
$ uname -a
Linux schlupp 2.6.22-14-generic #1 SMP Tue Feb 12 07:42:25 UTC 2008 i686 GNU/Linux

The drive is a LiteOn LH-20A1L. I remember having similar reading problems with my old IDE writer, which I thought to be dying. I also configured packetwriting the IDE drive (read-only) in my Thinkpad X20 (which normally does not make sense, admittedly) - same problem. I expect the problem to occur with any drive for which packet writing is enabled in /etc/default/udftools.

Additional information

$ uname -a
Linux schlupp 2.6.22-14-generic #1 SMP Tue Feb 12 07:42:25 UTC 2008 i686 GNU/Linux

lspci and dmesg follow.

[Leann Ogasawara (leannogasawara)]

Hi David,

The Hardy Heron Alpha series is currently under development and contains an updated version of the kernel. I don't suppose you'd be willing to test the latest Hardy Alpha release and verify if this bug is still an issue? http://www.ubuntu.com/testing . Please let us know. We'll keep this report open against the actively developed kernel but will close against 2.6.22. Thanks.

[David Meier (droebbel-melta)]

Same problem with current hardy and 2.6.24-12-generic.

[David Meier (droebbel-melta)]

I'd also like to emphasize that this bug is likely affect every system as soon as you configure udftools for packetwriting (1 minute max).

I am happy to test, but any developer able to debug the matter should also be able to test it himself, which might simplify the whole thing ;)

[Leann Ogasawara (leannogasawara)]

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

[Launchpad Janitor (janitor)]

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

[Gintautas Miliauskas (gintas)]

I ran into this very same problem with a brand new Intrepid kernel:

[~]$ uname -a
Linux satellite 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686 GNU/Linux

Took quite a while to isolate and debug. Disabling udftools (version 1.0.0b3-14) fixed it.

[Jeremy Foshee (jeremyfoshee)]

This bug report was marked as Triaged a while ago but has not had any updated comments for quite some time. Please let us know if this issue remains in the current Ubuntu release, http://www.ubuntu.com/getubuntu/download . If the issue remains, click on the current status under the Status column and change the status back to "New". Thanks.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[Jeremy Foshee (jeremyfoshee)]

This bug report was marked as Incomplete and has not had any updated comments for quite some time. As a result this bug is being closed. Please reopen if this is still an issue in the current Ubuntu release http://www.ubuntu.com/getubuntu/download . Also, please be sure to provide any requested information that may have been missing. To reopen the bug, click on the current status under the Status column and change the status back to "New". Thanks.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]