On linux 2.6.9 the latest 5.0 update version of jstack throws debugger exception.

Thread 26023: (state = BLOCKED)
Error occurred during stack walking:
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerExc
eption: get_thread_regs failed for a lwp
       at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWo
rkerThread.execute(LinuxDebuggerLocal.java:134)
       at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegi
sterSet(LinuxDebuggerLocal.java:437)
       at sun.jvm.hotspot.debugger.linux.LinuxThread.getContext(LinuxThread.java
:48)
       at sun.jvm.hotspot.runtime.linux_x86.LinuxX86JavaThreadPDAccess.getCurren
tFrameGuess(LinuxX86JavaThreadPDAccess.java:75)
       at sun.jvm.hotspot.runtime.JavaThread.getCurrentFrameGuess(JavaThread.jav
a:252)
       at sun.jvm.hotspot.runtime.JavaThread.getLastJavaVFrameDbg(JavaThread.jav
a:211)
       at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:50)
       at sun.jvm.hotspot.tools.JStack.run(JStack.java:41)
       at sun.jvm.hotspot.tools.Tool.start(Tool.java:204)
       at sun.jvm.hotspot.tools.JStack.main(JStack.java:58)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed fo
r a lwp


One of sun customer is facing this problem and would like this bug
to be fixed in 5.0 update release.