Bug ID: JDK-6670173 SA: jstack fails due to null sp on x86

Type: Bug
Component: core-svc
Sub-Component: tools
Affected Version: 5.0

Priority: P4
Status: Resolved
Resolution: Fixed
OS: solaris_10
CPU: x86

Submitted: 2008-03-02
Updated: 2014-02-26
Resolved: 2009-03-24

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Other
1.4.2_21Fixed

Observed on Solaris 10 x86, jstack fails to give a stacktrace. 

e.g.
(5.10)$ jstack 2135
Attaching to process ID 2135, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 1.5.0_14-b03
Thread t@1: (state = BLOCKED)


Thread t@14: (state = BLOCKED)


Thread t@13: (state = BLOCKED)


...

This failure is not observed on Solaris 8 x86.

WORK AROUND None.

02-03-2008

EVALUATION In X86CurrentFrameGuess we are finding a null sp from the thread context, and bailing out. In JDK6 as part of 6463133, we change the "frame guesser" to look again if the sp it finds is null. Putting this single change from that CR into 5.0 makes jstack work. (Another tactic of starting guessing from fp instead of sp also worked.) *** (#1 of 1): [ UNSAVED ] ###@###.###

02-03-2008

SUGGESTED FIX Copy this change from JDK6: hotspot/agent/src/share/classes/sun/jvm/hotspot/runtime/x86/X86CurrentFrameGuess.java 1.1 if (sp == null) { 1.10.1.1 // Bail out if no last java frame eithe 1.10.1.1 if (thread.getLastJavaSP() != null) { 1.10.1.1 setValues(thread.getLastJavaSP(), thread.getLastJavaFP(), null); 1.10.1.1 return true; 1.10.1.1 } 1.1 // Bail out

02-03-2008