Description of problem:
When attempting to report a crash of the current build of "rhythmbox" by means of abrt, debugging information is retrieved in order to create a useful backtrace. One of the concerned packages is webkitgtk3-debuginfo-1.3.11-3.fc15.x86_64.rpm which in the current case is downloaded to /var/run/abrt/tmp-2515-1298125790/.
After the debuginfo package has been downloaded, 20% of /var/run are used. Before having unpacked it completely, 100% of /var/run are used. At this point, the system locks hard, requiring a hard reset.

Version-Release number of selected component (if applicable):
abrt-1.1.17-1.fc15.1.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Crash rhythmbox by clicking selecting menu item "Import file...".
2. Report bug via abrt.
  
Actual results:
Retrieving and extracting debugging info for package webkitgtk fails because the 1024 MB tmpfs of /var/run is too small to cope with it.

Expected results:
Debugging info for package webkitgtk is retrieved and unpacked successfully.

Additional info:
According to http://fedoraproject.org/wiki/Features/var-run-tmpfs "/var/run and /var/lock contain small runtime files", please note the word "SMALL".
For the current F15 tree, /var/run is mounted as tmpfs with a size of 1024 MB (on my system) which seems to be an ample amount. System memory is 2048 MB.
However, downloading the debug info of webkitgtk grabs 20% of /var/run, and the extracted debuginfo exceeds the remaining 80% which led to locking up my system in one case. At a second attempt, abrt gracefully aborted this operation because of unsufficient file system space without locking up the system.