Bug#760148: grub-common: grub-mount hangs forever, trying to mount ext4 partition, causing 100% CPU load

[Colin Watson]

On Mon, Sep 01, 2014 at 12:08:15PM +0200, Johannes Rohr wrote:
> I have an Arch Linux install on /dev/sda9. 
> 
> When OS Prober is run, grub-mount /dev/sda9 /var/lib/os-prober/mount
> just hangs forever, causing 100% CPU load. There are no issues with
> other partitions, it seems.

This will take a few debugging passes.  The first step is to narrow this
down to a few operations that will reproduce the hang without needing to
run all of os-prober.  Could you put "set -x" on the first line of
/usr/share/os-prober/common.sh, re-run os-prober, and attach the output?
Hopefully this will let us make a guess at a reduced test case.

Thanks,

-- 
Colin Watson                                       [cjwatson at debian.org]