I am using eclipse 4.2 and after installing keshmesh and running it after a while I get the following error:
An internal error occurred during: "Finding bugs in myProject...".
Attempted to beginRule: P/myProject, does not match outer scope rule: MutexSchedulingRule, resource: P/myProject
Findbugs was also having this problem and it was fixed in version 2.0.2. So you probably have to upgrade the findbugs you use...
http://sourceforge.net/p/findbugs/bugs/1112/
http://sourceforge.net/p/findbugs/bugs/1121/