when trying to use jstack, it fails: # jstack -l -F -m 13492 Attaching to process ID 13492, please wait... sun.jvm.hotspot.debugger.NoSuchSymbolException: Could not find symbol "gHotSpotVMTypes" in any of the known library names (libjvm.so, libjvm_g.so, gamma_g) at sun.jvm.hotspot.HotSpotTypeDataBase.lookupInProcess(HotSpotTypeDataBase.java:585) at sun.jvm.hotspot.HotSpotTypeDataBase.readVMTypes(HotSpotTypeDataBase.java:150) at sun.jvm.hotspot.HotSpotTypeDataBase.<init>(HotSpotTypeDataBase.java:85) at sun.jvm.hotspot.bugspot.BugSpotAgent.setupVM(BugSpotAgent.java:569) at sun.jvm.hotspot.bugspot.BugSpotAgent.go(BugSpotAgent.java:493) at sun.jvm.hotspot.bugspot.BugSpotAgent.attach(BugSpotAgent.java:331) at sun.jvm.hotspot.tools.Tool.start(Tool.java:163) at sun.jvm.hotspot.tools.JStack.main(JStack.java:86) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.tools.jstack.JStack.runJStackTool(JStack.java:136) at sun.tools.jstack.JStack.main(JStack.java:102) Debugger attached successfully. jstack requires a java VM process/core! # java -version java version "1.7.0_07" OpenJDK Runtime Environment (IcedTea7 2.3.2) (Gentoo build 1.7.0_07-b30) OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)
today i got different error (i did not try on the same application yesterday): $ ps ax | grep java 20867 ? Sl 0:36 /usr/lib/jvm/icedtea-7/bin/java -classpath /usr/share/josm/lib/josm.jar -Djava.library.path=/lib:/usr/lib -jar /usr/share/josm/lib/josm.jar $ jstack -l -F -m 20867 Attaching to process ID 20867, please wait... Debugger attached successfully. Server compiler detected. JVM version is 23.2-b09 Exception in thread "main" java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.tools.jstack.JStack.runJStackTool(JStack.java:136) at sun.tools.jstack.JStack.main(JStack.java:102) Caused by: java.lang.RuntimeException: Unable to deduce type of thread from address 0x00007f69580ca800 (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread, or SurrogateLockerThread) at sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:152) at sun.jvm.hotspot.runtime.Threads.first(Threads.java:140) at sun.jvm.hotspot.tools.PStack.initJFrameCache(PStack.java:205) at sun.jvm.hotspot.tools.PStack.run(PStack.java:66) at sun.jvm.hotspot.tools.PStack.run(PStack.java:53) at sun.jvm.hotspot.tools.PStack.run(PStack.java:48) at sun.jvm.hotspot.tools.JStack.run(JStack.java:60) at sun.jvm.hotspot.tools.Tool.start(Tool.java:221) at sun.jvm.hotspot.tools.JStack.main(JStack.java:86) ... 6 more Caused by: sun.jvm.hotspot.types.WrongTypeException: No suitable match for type of address 0x00007f69580ca800 at sun.jvm.hotspot.runtime.InstanceConstructor.newWrongTypeException(InstanceConstructor.java:62) at sun.jvm.hotspot.runtime.VirtualConstructor.instantiateWrapperFor(VirtualConstructor.java:80) at sun.jvm.hotspot.runtime.Threads.createJavaThreadWrapper(Threads.java:148) ... 14 more jstack from oracle-jdk-bin works fine.
i just found out that the original report is invalid. i used wrong process id. anyway, the report in comment #1 is still valid.
Even if you get the pid wrong the output is not what one would expect. I can't reproduce the issue though. May I ask you to add your emerge --info for icedtea in the hope it helps someone to track the issue down?
just checked again today and works fine so i was probably doing something wrong before
