Some people have reported the JVM crashes during a BUgzilla import.

from the stack trace the relevent lines are:

Current thread (0x080f2b38):  JavaThread "CompilerThread0" daemon [_thread_in_native, id=8380] 

and

Current CompileTask:
opto:1605 org.apache.lucene.index.IndexReader$1.doBody()Ljava/lang/Object; (99 bytes) 

I believe they are seeing the same JVM bug as reported at:
http://forum.java.sun.com/thread.jspa?threadID=691320&tstart=1

It refers to the bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6355639

It looks like it affects only the latest jvm 1.5_06-b05 (well the people all seem to be using it).
Workarounds include:

• You could perhaps try downgrading jvm's.
• Excluding that class from compilation:

  -XX:CompileCommand=exclude,org/apache/lucene/index/IndexReader\$1,doBody 
  

We have also ahd some reports of this affecting 1.5.0_05 as well