I am running a relatively recent githead (April 17) of 3.9.1. I have a single pattern that results in a segmentation fault when running pdbtool test --validate patterndb.xml patterndb can be found at http://web.uvic.ca/~erempel/syslog-ng/patterndb.xml As it stands now I realize that the pattern does NOT match the test, but it should not segfault. A single space removed from the pattern makes the test succeed. The working patterndb is at http://web.uvic.ca/~erempel/syslog-ng/patterndb2.xml Any help would be appreciated.