Bug#1107479: util-linux: blkid hangs forever after inserting a DVD-RAM
On 7/2/25 5:08 PM, Ben Hutchings wrote:
> On Sun, 2025-06-29 at 12:26 +0200, Uwe Kleine-König wrote:
>> Hello Roland,
>>
>> On Sun, Jun 29, 2025 at 11:46:00AM +0200, Roland Sommer wrote:
>>> [correcting CC recipients]
>>
>> Huh, how did I manage that (rhetorical question)? Thanks
>>
>>>> Ahh, now that makes sense. pktsetup calls `/sbin/modprobe pktcdvd`
>>>> explicitly, the blacklist entry doesn't help for that. Without the
>>>> kernel module renamed, does the 2nd DVD-RAM result in the blocking
>>>> behaviour?
>>>
>>> Yes.
>>
>> OK, that makes sense. So udev does in this order:
>>
>> - auto-load the module (which is suppressed with the backlist entry)
>> - call blkid (which blocks if the module is loaded)
>> - call pktsetup (which loads the module even in presence of the
>> blacklist entry).
> [...]
>
> I tested with a CD-RW, and the behaviour was slightly different:
>
> - Nothing automtically created a pktcdvd device, so blkid initially
> worked with a CD-RW inserted and the pktcdvd modules loaded.
> - After running pktsetup to create the block device /dev/pktcdvd/0,
> blkid and any other program attempting to open that device hung.
>
> My conslusion is that pktcdvd is eqaully broken for CD-RWs.
Not surprising. Maybe we should take another stab at killing it
from the kernel.
--
Jens Axboe
Reply to: