jstack(1) NAME jstack - Prints Java thread stack traces for a Java process, core file, or remote debug server. This command is experimental and unsupported. SYNOPSIS jstack [ options ] pid jstack [ options ] executable core jstack [ options ] [ server-id@ ] remote-hostname-or-IP options The command-line options. See Options. pid The process ID for which the stack trace is printed. The process must be a Java process. To get a list of Java processes running on a machine, use the jps(1) command. executable The Java executable from which the core dump was produced. core The core file for which the stack trace is to be printed. 3
command prints Java stack traces of Java threads for a specified Java process, core file, or remote debug server. For each Java frame, the full class name, method name, byte code index (BCI), and line number, when available, are printed. With the -m option, the jstack command prints both Java and native frames of all threads with the program counter (PC). OPTIONS -F Force a stack dump when jstack [-l] pid does not respond. -l Long listing. Prints additional information about locks such as a list of owned java.util.concurrent ownable synchronizers. See the AbstractOwnableSynchronizer class description at http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/AbstractOwnableSynchronizer.html -m Prints a mixed mode stack trace that has both Java and native C/C++ frames. 4
0x00007f3492d03149 in pthread_cond_timedwait@@GLIBC_2.3 at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:23 #1 0x00007f3491e5361f in os::PlatformEvent::park(long) () from /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #2 0x00007f3491e54ff3 in os::sleep(Thread*, long, bool) () from /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #3 0x00007f3491c56f02 in JVM_Sleep () from /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #4 0x00007f348bc15994 in ?? () #5 0x00007f348c009800 in ?? () #6 0x00007f348bc156e2 in ?? () ….. #10 0x00007f348b3b3480 in ?? () #11 0x0000000000000000 in ?? () 7
stack frame (an activation). Frames can be C or Java frames, and the Java frames can be interpreted or compiled. In contrast, vframes represent source-level activations, so that one physical frame can correspond to multiple source level frames because of inlining. A frame is comprised of {pc, fp, sp} frame_x86.hpp frame interpreted compiled vframe vframe vframe 10
length) Read length addressable memory units from the inferior, starting at address. Returns a buffer object, which behaves much like an array or a string. It can be modified and given to the Inferior.write_memory function. In Python 3, the return value is a memoryview object 16
= gdb.selected_inferior().read_memory(addr, size) except: return None i = size - 1 n = 0 while i >= 0: n = n << 8 m = ord(buf[i]) n += m i -= 1 return n 17
public: // The last entry is identified over in the serviceability agent by // the fact that it has a NULL fieldName static VMStructEntry localHotSpotVMStructs[]; // The last entry is identified over in the serviceability agent by // the fact that it has a NULL typeName static VMTypeEntry localHotSpotVMTypes[]; // Table of integer constants required by the serviceability agent. // The last entry is identified over in the serviceability agent by // the fact that it has a NULL typeName static VMIntConstantEntry localHotSpotVMIntConstants[]; ……. 21
typeName; // The type name containing the given field (example: "Klass") const char* fieldName; // The field name within the type (example: "_name") const char* typeString; // Quoted name of the type of this field (example: "Symbol*"; int32_t isStatic; // Indicates whether following field is an offset or an address uint64_t offset; // Offset of field within structure; only used for nonstatic fields void* address; // Address of field; only used for static fields } VMStructEntry; Hotspot VMを構成する(C++の)クラス・フィールドを表現 22
class VMStructs; protected: static StubQueue* _code; // the interpreter code (codelets) abstractInterpreter.hpp stubs.hpp class StubQueue: public CHeapObj<mtCode> { friend class VMStructs; private: StubInterface* _stub_interface; // the interface prototype address _stub_buffer; // where all stubs are stored int _buffer_size; // the buffer size in bytes 37
pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 #1 0x00007f3491e5361f in os::PlatformEvent::park(long) () at /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #2 0x00007f3491e54ff3 in os::sleep(Thread*, long, bool) () at /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #3 0x00007f3491c56f02 in JVM_Sleep () at /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #4 0x00007f348bc15994 in j java/lang/Thread#sleep(J)V () #5 0x00007f348bc07c4d in j a#xxx3()V () #6 0x00007f348bc07c4d in j a#xxx2()V () #7 0x00007f348bc07c4d in j a#xxx1()V () #8 0x00007f348bc07c4d in j a#main([Ljava/lang/String;)V () #9 0x00007f348bc007a7 in <<entryframe>> () #10 0x00007f3491bc3c46 in JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, T at /v3/java/jdk1.8.0_66/jre/lib/amd64/server/libjvm.so #11 0x00007f3491c05262 in jni_invoke_static(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID #12 0x00007f3491c21c6a in jni_CallStaticVoidMethod () at /v3/java/jdk1.8.0_66/jre/lib/amd64/server/ #13 0x00007f3492ae7bcc in JavaMain () at /v3/java/jdk1.8.0_66/bin/../lib/amd64/jli/libjli.so #14 0x00007f3492cfd6aa in start_thread (arg=0x7f349311b700) at pthread_create.c:333 #15 0x00007f3492618eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 40
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