This issue is reported during beta test (on version PRQA plugin version 1.0.1), and reported by the tester like this:

Quote begin>
We have done some tests on Linux - using the plugin causes Jenkins to crash! We don't quite understand this - there was no information in the build log files.
However, we were able to run the command to analyse and generate the report as a normal build step as a shell command. We used exactly the same command as the for Windows:

• Obviously we used forward slashes in the path to the project

• I was wrong about qaw being called qaw.pl - it is called qaw on Linux

• qar is called qar.pl on Linux - but we added a symbolic link 'qar->qar.pl' in the qar binary directory. This seems the easiest solution (and perhaps we might include this link in future versions of war)
  <quote end