segmentation fault in the Java virtual machine

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1. An unexpected error has been detected by HotSpot Virtual Machine:
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2. SIGSEGV (0xb) at pc=0xb7825cd1, pid=2109, tid=1841359792
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3. Java VM: Java HotSpot(TM) Server VM (1.5.0_06-b05 mixed mode)
4. Problematic frame:
5. V [libjvm.so+0x3c9cd1]
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6. An error report file with more information is saved as hs_err_pid2109.log
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7. If you would like to submit a bug report, please visit:
8. http://java.sun.com/webapps/bugreport/crash.jsp
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Not really sure if this a Linux, a Java or a JIRA problem...

Removing the Lucene lock files and restarting Tomcat recovered the situation...