Bug#544067: grub-pc: grub-probe: error: cannot find a device for /.

[Luca Capello]

Hi Felix!

On Fri, 28 Aug 2009 16:13:46 +0200, Felix Zielcke wrote:
> Am Freitag, den 28.08.2009, 15:36 +0200 schrieb Luca Capello:
>> BTW, I do not have two hard disks on my machine, but only /dev/sda.
>
> Just remove it from device.map if you want or run grub-mkdevicemap.

I do not remember since which version both /dev/sda and /dev/sdb are
there, but I consider this as a bug.  Re-running grub-mkdevicemap
produced:

  # cat /boot/grub/device.map
  (hd0)   /dev/sda
  (hd1)   /dev/mmcblk0

And indeed I have a microSD in my SD reader, thus everything is OK.

>> -- Package-specific info:
>> 
>> *********************** BEGIN /proc/mounts
>> /dev/mapper/vggismo-lvroot / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0
>> /dev/dm-3 /home ext3 rw,relatime,errors=continue,data=ordered 0 0
>
> Seems like the dmsetup upgrade went a bit wrong for you.

Note that while /proc/mounts contains the above, `mount` correctly
reports / being /dev/dm-2.

> Check with `ls -l /dev/mapper/' if the files there are real devices or
> symlinks to /dev/dm-?

Yes, they are symlinks.

> If they're symlinks then this is #542435 which is actually caused by an
> upstream dmsetup change: #542422

BTW, in my case everything but /boot is on an encrypted LUKS, then LVM.

FWIW, the very same LVM bug caused cryptsetup to break: #544773.

> Though that has been fixed now but it seems like for some people just
> upgrading the package and rebooting doestn't solve the problem.

I do not reboot so often (thanks to my ThinkPad X60 correctly handling
ACPI suspend and hibernate), thus I guess that the LVM change was not
taken into consideration.

> In that case run `echo change > /sys/block/dm-?/uevent'
> Replace the ? with every /dev/dm-* device you have.

Done, and everything worked as expected.

I am not sure how to proceed here: it seems the bug was unrelated to
grub-pc, thus feel free to close or reassign it.

Thx, bye,
Gismo / Luca
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