FULL PRODUCT VERSION :
JVMs were on:

> java -version
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)

jstack itself was from 1.5.0_05

ADDITIONAL OS VERSION INFORMATION :
> uname -a
Linux sentrion.demo.sendmail.com 2.6.12.5 #1 SMP Wed Oct 5 02:50:11 UTC 2005 i686 pentium4 i386 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
When I run jstack against a Tomcat application it works fine, i.e., I get a stack trace with no issues or errors. Against another one of our applications (standalone java application not in Tomcat) I get numerous errors like:

Thread 3131: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
 - com.sendmail.iocaine.servers.mail.smtp.jilter.ProcessorQueue.getNextItem(long) @bci=89, line=106 (Compiled frame)
 - com.sendmail.iocaine.servers.mail.smtp.jilter.JilterProcessor.runThread() @bci=40, line=64 (Compiled frame)
Error occurred during stack walking:
java.lang.NullPointerException
        at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:214)
        at sun.jvm.hotspot.runtime.x86.X86Frame.addressOfInterpreterFrameMethod(X86Frame.java:442)
        at sun.jvm.hotspot.runtime.Frame.getInterpreterFrameMethod(Frame.java:354)
        at sun.jvm.hotspot.runtime.InterpretedVFrame.getMethod(InterpretedVFrame.java:19)
        at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:51)
        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)

I think maybe the key here is the "compiled frame" part of this. The working case against Tomcat was all with "interpreted frames".

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run jstack against a running version of our stanalone application.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect a jstack dump without errors.
ACTUAL -
Numerous threads fail to dump stack as follows:

Thread 3131: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
 - com.sendmail.iocaine.servers.mail.smtp.jilter.ProcessorQueue.getNextItem(long) @bci=89, line=106 (Compiled frame)
 - com.sendmail.iocaine.servers.mail.smtp.jilter.JilterProcessor.runThread() @bci=40, line=64 (Compiled frame)
Error occurred during stack walking:
java.lang.NullPointerException
        at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:214)
        at sun.jvm.hotspot.runtime.x86.X86Frame.addressOfInterpreterFrameMethod(X86Frame.java:442)
        at sun.jvm.hotspot.runtime.Frame.getInterpreterFrameMethod(Frame.java:354)
        at sun.jvm.hotspot.runtime.InterpretedVFrame.getMethod(InterpretedVFrame.java:19)
        at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:51)
        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)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
See Actual Result above.

REPRODUCIBILITY :
This bug can be reproduced always.