Bug#558686: what version of libparted are you using?
I've just begun reading about this problem, and have a quick question:
What version of libparted are you using?
I ask because there have been significant changes in the area
of detecting when partitions are active.
In particular: v1.9.0-137-g048602c
ped_partition_busy: do not call the libparted exception handler
Modify libparted/arch/linux.c _partition_get_part_dev() to not call
_device_stat() but instead use stat directly, as _device_stat() calls
the libparted exception handler, and we don't want this here, the only
caller of _partition_get_part_dev() is _partition_is_mounted(), which
in turn only gets called by linux_partition_is_busy(), and we don't
want to "throw" exceptions from ped_partition_busy().
This issue was noticed in combination with pyparted as used by
anaconda, see: http://bugzilla.redhat.com/527035#c10