Created attachment 34641 [details]
Proposed patch to fix pm-suspend

pm-suspend hangs with the process "grep -vxFf /var/run/pm-utils/pm-suspend/ storage/parameters.rm /var/run/pm-utils/pm-suspend/storage/parameters" taking 100% CPU

An update in grep 2.6.2 broke the -Ff option for pattern files with blank lines causing an infinite loop, and the behavior of -Ff in grep 2.6.3 will match all lines if the pattern file contains a blank line. See http://lists.gnu.org/archive/html/bug-grep/2010-04/msg00037.html

/var/run/pm-utils/pm-suspend/storage/parameters.rm is generated with a leading blank line in pm-utils/functions remove_parameters with a 
echo '' > "$PARAMETERS.rm"
command.

From looking at the source, pm-utils=1.3.0 will also be affected.

See also: http://bugs.archlinux.org/task/18881

Steps to reproduce:
1) Run pm-suspend with grep>=2.6.2 (may only affect multibyte locales per bugfix news at http://savannah.gnu.org/forum/forum.php?forum_id=6274)

Attached is a proposed patch.

For the record, I'm running Arch Linux on an MSI Wind U100.