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We use jstack on servers to detect if java apps are getting deadlocked. It's not working on one of our Linux servers. I think O/S version is: $cat /etc/issue.net Red Hat Enterprise Linux Server release 5.6 (Tikanga) Kernel \r on an \m Java version running on server: java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode) When I try: jstack 19114 I get: 19114: Unable to open socket file: target process not responding or HotSpot VM not loaded The -F option can be used when the target process is not responding When I try: jstack -F 19114 I get: Attaching to process ID 19114, please wait... Debugger attached successfully. Deadlock Detection: No deadlocks found. Thread 19180: (state = BLOCKED) Error occurred during stack walking: sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed for a lwp at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(LinuxDebuggerLocal.java:152) at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet(LinuxDebuggerLocal.java:466) at sun.jvm.hotspot.debugger.linux.LinuxThread.getContext(LinuxThread.java:65) at sun.jvm.hotspot.runtime.linux_amd64.LinuxAMD64JavaThreadPDAccess.getCurrentFrameGuess(LinuxAMD64JavaThreadPDAccess.java:92) at sun.jvm.hotspot.runtime.JavaThread.getCurrentFrameGuess(JavaThread.java:256) at sun.jvm.hotspot.runtime.JavaThread.getLastJavaVFrameDbg(JavaThread.java:218) at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76) at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45) at sun.jvm.hotspot.tools.JStack.run(JStack.java:60) at sun.jvm.hotspot

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