[Bug 445852] Re: devkit-disks-probe-ata-smart causes HSM Violations on SSD, and potential hardware death

Andrew Simpson andrew.simpson at paradise.net.nz
Fri Dec 18 20:12:19 UTC 2009


O.K., I think I have a better workaround for this bug.

The problem is that udev reads the udev rule files into memory and then
uses inotify to watch for changes in the file.  As soon as the rule file
changes, udev is informed and re-reads the file.  That means that when
apt-get updates the rule file, damage can be done before you get a
chance to patch it again.

What I have done is put a dummy file in for devkit-disks-probe-ata-smart
and used dpkg-divert to make the system accept the dummy file.

Run the following command:

$ sudo dpkg-divert --divert --add --rename --divert /lib/udev/devkit-
disks-probe-ata-smart.bak  /lib/udev/devkit-disks-probe-ata-smart

This renames the existing file to devkit-disks-probe-ata-smart.bak and
tells dpkg / apt-get to install any new updates to the _changed_ file
name.

To see your divert (and others in the system):

$ sudo dpkg-divert --list

Now we create a dummy file:

$ sudo /lib/udev/nano devkit-disks-probe-ata-smart     (or some other
editor of your choice)

#!/bin/bash
#
exit 0

Save the file.

This dummy file does precisely nothing, but it allows udev to run it...

Make the new dummy file executable:

$ sudo chmod 755 /lib/udev/devkit-disks-probe-ata-smart

That's it.

When the bug gets really fixed, we need to remove the dummy file and
divert:

$ sudo rm /lib/udev/devkit-disks-probe-ata-smart
$ dpkg-divert --rename --remove  /lib/udev/devkit-disks-probe-ata-smart

-- 
devkit-disks-probe-ata-smart causes HSM Violations on SSD, and potential hardware death
https://bugs.launchpad.net/bugs/445852
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