@andy: Yes, the machine completely used to freeze in my previous tries(No,
VT switching, lock keys gone dead). dd perfectly read data from the dvd
inserted when the cd is not mounted. Another thing is that the system does
not try to automount in Jaunty(contrary to previous releases). When I
execute mount the system freezes. I don't recall kernel panics or
notifications from my pre-Jaunty tries, right now due to lack of VT's i can
not check. The cause is the pata_marvell driver i think.

Now to make things more interesting, in my second try after rebooting, i got
this instead of a crash;

root@endor:/etc# mount /dev/scd0 /media/cdrom0/
mount: /dev/sr0: unknown device

And, the dd part:
root@endor:/etc# dd if=/dev/scd0 of=out
dd: opening `/dev/scd0': No medium found

I might have time in weekend to inspect the problem in the weekend, so if
anything i can help with let me know.

On Tue, Apr 28, 2009 at 1:28 PM, Andy Whitcroft <email address hidden> wrote:

> @yaman --- when you say hang, so you mean that the machine stops
> completly dead when the issue occurs.  is it possible to login to the
> machine remotly?  is it possible to switch to an alternate VT with ctrl-
> alt-f1 etc?  It is possible the kernel is panic'ing and peoducing
> messages on VT1.  Another sensible test would be to trigger the fault by
> opening the device using 'dd' after a delay, and switching to VT1 before
> the problem occurs, a panic may be visible there.  I would recommend
> trying this with a final version of either Intrepid or Jaunty you appear
> to have used an early Intrepid previously.  Please report back here.
>
> ** Changed in: linux (Ubuntu)
>       Status: Incomplete => In Progress
>
> ** Changed in: linux (Ubuntu)
>       Status: In Progress => Incomplete
>
> ** Changed in: linux (Ubuntu)
>     Assignee: (unassigned) => Andy Whitcroft (apw)
>
> --
> hang on open("/dev/scd0", ... was gutsy ubiquity and partprobe hang
> https://bugs.launchpad.net/bugs/156052
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” source package in Ubuntu: Incomplete
> Status in “linux-source-2.6.22” source package in Ubuntu: Won't Fix
> Status in “ubiquity” source package in Ubuntu: Invalid
>
> Bug description:
> Boot either live cd:
> ubuntu-7.10-desktop-i386
> kubuntu-7.10-desktop-i386
>
> I have more detailed information about the kubuntu disk,
> but the same problem appeared with the ubuntu disk
>
> Using kubuntu live cd:
> Click on installer
> answer three questions
> it then says "scanning disk" and at some percentage (46%?)
> it freezes... only recourse is to power cycle.
> This is repeatable.
>
> Ok, try some other things.
> Finally i try something that narrows it down:
>
> strace partprobe -d -s
> This hangs at:
> open("/dev/scd0", ...
>
> Ok, boot the live cd again, this time do:
> rm /dev/scd0
> (as root of course)
> Now click on the install icon.
>
> Everything works!
> But three hours lost out of my life :~)
>
> Here is the relevent lshw output:
>
>        *-pci:1
>             description: PCI bridge
>             product: 82801H (ICH8 Family) PCI Express Port 2
>             vendor: Intel Corporation
>             physical id: 1c.1
>             bus info: pci@0000:00:1c.1
>             version: 02
>             width: 32 bits
>             clock: 33MHz
>             capabilities: pci pciexpress msi pm normal_decode bus_master
> cap_list
>             configuration: driver=pcieport-driver
>           *-ide
>                description: IDE interface
>                product: 88SE6101 single-port PATA133 interface
>                vendor: Marvell Technology Group Ltd.
>                physical id: 0
>                bus info: pci@0000:02:00.0
>                logical name: scsi4
>                version: b1
>                width: 32 bits
>                clock: 33MHz
>                capabilities: ide pm msi pciexpress bus_master cap_list
> emulated
>                configuration: driver=pata_marvell latency=0
> module=pata_marvell
>              *-cdrom
>                   description: DVD reader
>                   product: DVD D  DH16D2P
>                   vendor: ATAPI
>                   physical id: 0.1.0
>                   bus info: scsi@4:0.1.0
>                   logical name: /dev/cdrom
>                   logical name: /dev/dvd
>                   logical name: /dev/scd0
>                   logical name: /dev/sr0
>                   version: HP53
>                   capabilities: removable audio dvd
>                   configuration: ansiversion=5 status=open
>