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From 3a774c78473c4fc3dcd1dc39f8c9daec4c5a6502 Mon Sep 17 00:00:00 2001
Date: Thu, 21 Sep 2023 14:45:54 +0800
Subject: 8213397-Stack-dump-should-show-more-clearly-when-a-t.patch
---
hotspot/src/share/vm/oops/instanceKlass.cpp | 23 +-
hotspot/src/share/vm/runtime/thread.cpp | 2 +
hotspot/src/share/vm/runtime/thread.hpp | 8 +
.../src/share/vm/runtime/thread.inline.hpp | 12 +
hotspot/src/share/vm/runtime/vframe.cpp | 8 +
.../TestThreadDumpClassInitMonitor.java | 217 ++++++++++++++++++
6 files changed, 259 insertions(+), 11 deletions(-)
create mode 100644 hotspot/test/runtime/Thread/TestThreadDumpClassInitMonitor.java
diff --git a/hotspot/src/share/vm/oops/instanceKlass.cpp b/hotspot/src/share/vm/oops/instanceKlass.cpp
index 538645bbe..993778270 100644
--- a/hotspot/src/share/vm/oops/instanceKlass.cpp
+++ b/hotspot/src/share/vm/oops/instanceKlass.cpp
@@ -920,25 +920,28 @@ void InstanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) {
bool wait = false;
+ assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
+ JavaThread* jt = (JavaThread*)THREAD;
+
// refer to the JVM book page 47 for description of steps
// Step 1
{
oop init_lock = this_oop->init_lock();
ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
- Thread *self = THREAD; // it's passed the current thread
-
// Step 2
// If we were to use wait() instead of waitInterruptibly() then
// we might end up throwing IE from link/symbol resolution sites
// that aren't expected to throw. This would wreak havoc. See 6320309.
- while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) {
- wait = true;
- ol.waitUninterruptibly(CHECK);
+ while (this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(jt)) {
+ wait = true;
+ jt->set_class_to_be_initialized(this_oop());
+ ol.waitUninterruptibly(jt);
+ jt->set_class_to_be_initialized(NULL);
}
// Step 3
- if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) {
+ if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(jt)) {
DTRACE_CLASSINIT_PROBE_WAIT(recursive, InstanceKlass::cast(this_oop()), -1,wait);
return;
}
@@ -968,7 +971,7 @@ void InstanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) {
// Step 6
this_oop->set_init_state(being_initialized);
- this_oop->set_init_thread(self);
+ this_oop->set_init_thread(jt);
}
// Step 7
@@ -1004,8 +1007,6 @@ void InstanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) {
// Step 8
{
- assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
- JavaThread* jt = (JavaThread*)THREAD;
DTRACE_CLASSINIT_PROBE_WAIT(clinit, InstanceKlass::cast(this_oop()), -1,wait);
// Timer includes any side effects of class initialization (resolution,
// etc), but not recursive entry into call_class_initializer().
@@ -1031,14 +1032,14 @@ void InstanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) {
CLEAR_PENDING_EXCEPTION;
// JVMTI has already reported the pending exception
// JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
- JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
+ JvmtiExport::clear_detected_exception(jt);
{
EXCEPTION_MARK;
this_oop->set_initialization_state_and_notify(initialization_error, THREAD);
CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
// JVMTI has already reported the pending exception
// JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
- JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
+ JvmtiExport::clear_detected_exception(jt);
}
DTRACE_CLASSINIT_PROBE_WAIT(error, InstanceKlass::cast(this_oop()), -1,wait);
if (e->is_a(SystemDictionary::Error_klass())) {
diff --git a/hotspot/src/share/vm/runtime/thread.cpp b/hotspot/src/share/vm/runtime/thread.cpp
index 2be226463..50543ac73 100644
--- a/hotspot/src/share/vm/runtime/thread.cpp
+++ b/hotspot/src/share/vm/runtime/thread.cpp
@@ -1538,6 +1538,8 @@ void JavaThread::initialize() {
_popframe_preserved_args_size = 0;
_frames_to_pop_failed_realloc = 0;
+_class_to_be_initialized = NULL;
+
pd_initialize();
}
diff --git a/hotspot/src/share/vm/runtime/thread.hpp b/hotspot/src/share/vm/runtime/thread.hpp
index 220fe9316..1d3caf9aa 100644
--- a/hotspot/src/share/vm/runtime/thread.hpp
+++ b/hotspot/src/share/vm/runtime/thread.hpp
@@ -1802,11 +1802,19 @@ public:
bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
inline void set_done_attaching_via_jni();
+
+ // Stack dump assistance: Track the class we want to initialize but for which we have to wait
+ // on its init_lock() because it is already being initialized.
+ inline void set_class_to_be_initialized(InstanceKlass* k);
+ inline InstanceKlass* class_to_be_initialized() const;
+
private:
// This field is used to determine if a thread has claimed
// a par_id: it is UINT_MAX if the thread has not claimed a par_id;
// otherwise its value is the par_id that has been claimed.
uint _claimed_par_id;
+
+ InstanceKlass* _class_to_be_initialized;
public:
uint get_claimed_par_id() { return _claimed_par_id; }
void set_claimed_par_id(uint id) { _claimed_par_id = id;}
diff --git a/hotspot/src/share/vm/runtime/thread.inline.hpp b/hotspot/src/share/vm/runtime/thread.inline.hpp
index b05e0ec5c..d3ab3aba9 100644
--- a/hotspot/src/share/vm/runtime/thread.inline.hpp
+++ b/hotspot/src/share/vm/runtime/thread.inline.hpp
@@ -74,4 +74,16 @@ inline void JavaThread::set_done_attaching_via_jni() {
OrderAccess::fence();
}
+// Allow tracking of class initialization monitor use
+inline void JavaThread::set_class_to_be_initialized(InstanceKlass* k) {
+ assert((k == NULL && _class_to_be_initialized != NULL) ||
+ (k != NULL && _class_to_be_initialized == NULL), "incorrect usage");
+ assert(this == Thread::current(), "Only the current thread can set this field");
+ _class_to_be_initialized = k;
+}
+
+inline InstanceKlass* JavaThread::class_to_be_initialized() const {
+ return _class_to_be_initialized;
+}
+
#endif // SHARE_VM_RUNTIME_THREAD_INLINE_HPP
diff --git a/hotspot/src/share/vm/runtime/vframe.cpp b/hotspot/src/share/vm/runtime/vframe.cpp
index b3a6d0770..93d62ade7 100644
--- a/hotspot/src/share/vm/runtime/vframe.cpp
+++ b/hotspot/src/share/vm/runtime/vframe.cpp
@@ -176,6 +176,14 @@ void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
Klass* k = obj->klass();
st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", (address)obj, k->external_name());
}
+ else if (thread()->osthread()->get_state() == OBJECT_WAIT) {
+ // We are waiting on an Object monitor but Object.wait() isn't the
+ // top-frame, so we should be waiting on a Class initialization monitor.
+ InstanceKlass* k = thread()->class_to_be_initialized();
+ if (k != NULL) {
+ st->print_cr("\t- waiting on the Class initialization monitor for %s", k->external_name());
+ }
+ }
}
diff --git a/hotspot/test/runtime/Thread/TestThreadDumpClassInitMonitor.java b/hotspot/test/runtime/Thread/TestThreadDumpClassInitMonitor.java
new file mode 100644
index 000000000..8aa218efb
--- /dev/null
+++ b/hotspot/test/runtime/Thread/TestThreadDumpClassInitMonitor.java
@@ -0,0 +1,217 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8213397 8217337
+ * @summary Check that the thread dump shows when a thread is blocked
+ * on a class initialization monitor
+ *
+ * @library /testlibrary
+ * @run main/othervm TestThreadDumpClassInitMonitor
+ */
+
+import com.oracle.java.testlibrary.*;
+
+import java.io.IOException;
+import java.util.List;
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+
+public class TestThreadDumpClassInitMonitor {
+ // jstack tends to be closely bound to the VM that we are running
+ // so use getTestJDKTool() instead of getCompileJDKTool() or even
+ // getJDKTool() which can fall back to "compile.jdk".
+ final static String JSTACK = JDKToolFinder.getTestJDKTool("jstack");
+ final static String PID = getPid();
+ final static Thread current = Thread.currentThread();
+
+ /*
+ * This is the output we're looking for:
+ *
+ * "TestThread" #22 prio=5 os_prio=0 cpu=1.19ms elapsed=0.80s tid=0x00007f8f9405d800 nid=0x568b in Object.wait() [0x00007f8fd94d0000]
+ * java.lang.Thread.State: RUNNABLE
+ * Thread: 0x00007f8f9405d800 [0x568b] State: _at_safepoint _has_called_back 0 _at_poll_safepoint 0 // DEBUG ONLY
+ * JavaThread state: _thread_blocked // DEBUG ONLY
+ * at TestThreadDumpClassInitMonitor$Target$1.run(TestThreadDumpClassInitMonitor.java:69)
+ * - waiting on the Class initialization monitor for TestThreadDumpClassInitMonitor$Target
+ *
+ */
+ final static String TEST_THREAD = "TestThread";
+ final static String TEST_THREAD_ENTRY = "\"" + TEST_THREAD;
+ final static String IN_OBJECT_WAIT = "in Object.wait()";
+ final static String THREAD_STATE = "java.lang.Thread.State: RUNNABLE";
+ final static String THREAD_INFO = "Thread:"; // the details are not important
+ final static String JAVATHREAD_STATE = "JavaThread state: _thread_blocked";
+ final static String CURRENT_METHOD = "at TestThreadDumpClassInitMonitor$Target$1.run";
+ final static String WAIT_INFO = "- waiting on the Class initialization monitor for TestThreadDumpClassInitMonitor$Target";
+
+ volatile static boolean ready = false;
+
+ static List<String> stackDump; // jstack output as lines
+
+ static class Target {
+
+ static int field;
+
+ // The main thread will initialize this class and so
+ // execute the actual test logic here.
+ static {
+ if (Thread.currentThread() != current) {
+ throw new Error("Initialization logic error");
+ }
+ System.out.println("Initializing Target class in main thread");
+
+ Thread t = new Thread() {
+ public void run() {
+ System.out.println("Test thread about to access Target");
+ ready = true; // tell main thread we're close
+ // This will block until the main thread completes
+ // static initialization of target
+ Target.field = 42;
+ System.out.println("Test thread done");
+ }
+ };
+ t.setName(TEST_THREAD);
+ t.start();
+
+ // We want to run jstack once the test thread is blocked but
+ // there's no programmatic way to detect that. So we check the flag
+ // that will be set just before it should block, then by the time
+ // we can exec jstack it should be ready.
+ try {
+ while (!ready) {
+ Thread.sleep(200);
+ }
+ }
+ catch (InterruptedException ie) {
+ throw new Error("Shouldn't happen");
+ }
+
+ // Now run jstack
+ try {
+ ProcessBuilder pb = new ProcessBuilder(JSTACK, PID);
+ OutputAnalyzer output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ stackDump = output.asLines();
+ }
+ catch (IOException ioe) {
+ throw new Error("Launching jstack failed", ioe);
+ }
+ }
+ }
+
+
+ public static void main(String[] args) throws Throwable {
+ // Implicitly run the main test logic
+ Target.field = 21;
+
+ // Now check the output of jstack
+ try {
+ // product builds miss 2 lines of information in the stack
+ boolean isProduct = !Platform.isDebugBuild();
+ int foundLines = 0;
+ parseStack: for (String line : stackDump) {
+ switch(foundLines) {
+ case 0: {
+ if (!line.startsWith(TEST_THREAD_ENTRY)) {
+ continue;
+ }
+ foundLines++;
+ if (!line.contains(IN_OBJECT_WAIT)) {
+ throw new Error("Unexpected initial stack line: " + line);
+ }
+ continue;
+ }
+ case 1: {
+ if (!line.trim().equals(THREAD_STATE)) {
+ throw new Error("Unexpected thread state line: " + line);
+ }
+ if (isProduct) {
+ foundLines += 3;
+ } else {
+ foundLines++;
+ }
+ continue;
+ }
+ case 2: { // Debug build
+ if (!line.startsWith(THREAD_INFO)) {
+ throw new Error("Unexpected thread info line: " + line);
+ }
+ foundLines++;
+ continue;
+ }
+ case 3: { // Debug build
+ if (!line.trim().equals(JAVATHREAD_STATE)) {
+ throw new Error("Unexpected JavaThread state line: " + line);
+ }
+ foundLines++;
+ continue;
+ }
+ case 4: {
+ if (!line.trim().startsWith(CURRENT_METHOD)) {
+ throw new Error("Unexpected current method line: " + line);
+ }
+ foundLines++;
+ continue;
+ }
+ case 5: {
+ if (!line.trim().equals(WAIT_INFO)) {
+ throw new Error("Unexpected monitor information line: " + line);
+ }
+ break parseStack;
+ }
+ default: throw new Error("Logic error in case statement");
+ }
+ }
+
+ if (foundLines == 0) {
+ throw new Error("Unexpected stack content - did not find line starting with "
+ + TEST_THREAD_ENTRY);
+ }
+ }
+ catch (Error e) {
+ // Dump the full stack trace on error so we can check the content
+ for (String line : stackDump) {
+ System.out.println(line);
+ }
+ throw e;
+ }
+ }
+
+ // This helper relies on RuntimeMXBean.getName() returning a string
+ // that looks like this: 5436@mt-haku
+ //
+ // The testlibrary has tryFindJvmPid(), but that uses a separate
+ // process which is much more expensive for finding out your own PID.
+ //
+ static String getPid() {
+ RuntimeMXBean runtimebean = ManagementFactory.getRuntimeMXBean();
+ String vmname = runtimebean.getName();
+ int i = vmname.indexOf('@');
+ if (i != -1) {
+ vmname = vmname.substring(0, i);
+ }
+ return vmname;
+ }
+}
\ No newline at end of file
--
2.22.0
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