Bug#638887: udev: cdrom_id process can not be killed

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Jamie,

Jameson Graef Rollins wrote:

> So this problem is now happening with other udev functions as well:
>
> Aug 25 00:53:14 servo udevd[23014]: timeout: killing 'scsi_id --export --whitelisted --device=/dev/sr0' [23017]
>
> This leaves me not particularly convinced that this is not at least
> partially a udev issue.

Sure, udev could be triggering a kernel bug that it did not trigger
before.

Does downgrading udev or the kernel help?  /var/log/dpkg.log should
describe the upgrade history of both, and http://snapshot.debian.org/
has historical packages.

[...]
> Please tell me what I can do to help debug.

Please send the full content of /var/log/dmesg after running

	echo d >/proc/sysrq-trigger
	echo w >/proc/sysrq-trigger

when a process is in this hung state.

Thanks,
Jonathan