RFR for JDK-8025198 Intermittent test failure: java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
Martin Buchholz
martinrb at google.com
Sun Nov 3 04:46:35 UTC 2013
I think the author of this test was sleep-deprived by baby Tristan back in
2007.[image: Inline image 1]
I tried and failed to find a single synchronizer that properly does what we
are trying to do with allStarted here. Too bad CountDownLatch.countDown
doesn't return the count. Best to introduce another synchronizer. I
propose this fix:
diff --git
a/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
b/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
--- a/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
+++ b/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
@@ -136,6 +136,7 @@
}
static final CountDownLatch allStarted = new
CountDownLatch(flakes.size());
+ static final AtomicInteger taskSerial = new AtomicInteger(0);
static final CountDownLatch allContinue = new CountDownLatch(1);
static class PermissiveSecurityManger extends SecurityManager {
@@ -164,7 +165,8 @@
}
@Override protected void beforeExecute(Thread t, Runnable r) {
allStarted.countDown();
- if (allStarted.getCount() < getCorePoolSize())
+ // Get last core pool cohort to start in unison
+ if (flakes.size() - taskSerial.incrementAndGet() <
getCorePoolSize())
try { allContinue.await(); }
catch (InterruptedException x) { unexpected(x); }
beforeExecuteCount.getAndIncrement();
On Fri, Nov 1, 2013 at 6:48 PM, Tristan Yan <tristan.yan at oracle.com> wrote:
> This only happened when I tried a 1000 times loop run, see the jstack
> out put below:
> Also by using jmap/jhat, below values help me find the reason
> flakes.size() = 25
> allStarted.state = 1
> beforeExecuteCount.count = 1
>
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.0-b56 mixed mode):
>
> "Attach Listener" #32 daemon prio=9 os_prio=31 tid=0x00007faf1d808000
> nid=0x390b waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "Thread-22" #31 prio=5 os_prio=31 tid=0x00007faf1d07b000 nid=0x5d0b
> waiting on condition [0x000000019b530000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-21" #30 prio=5 os_prio=31 tid=0x00007faf1d80c800 nid=0x5507
> waiting on condition [0x000000019ae1b000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-20" #29 prio=5 os_prio=31 tid=0x00007faf1c10b000 nid=0x6307
> waiting on condition [0x000000019b227000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-18" #27 prio=5 os_prio=31 tid=0x00007faf1c10a000 nid=0x6107
> waiting on condition [0x000000019b42d000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-14" #23 prio=5 os_prio=31 tid=0x00007faf1d80c000 nid=0x500b
> waiting on condition [0x000000019ad18000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-13" #22 prio=5 os_prio=31 tid=0x00007faf1c108800 nid=0x5f03
> waiting on condition [0x000000019b32a000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-12" #21 prio=5 os_prio=31 tid=0x00007faf1d80b000 nid=0x540b
> waiting on condition [0x000000019ab12000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-10" #19 prio=5 os_prio=31 tid=0x00007faf1d80a800 nid=0x5107
> waiting on condition [0x000000019af1e000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-6" #14 prio=5 os_prio=31 tid=0x00007faf1d809800 nid=0x5807 waiting
> on condition [0x000000019ac15000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Thread-8" #16 prio=5 os_prio=31 tid=0x00007faf1d809000 nid=0x5b03 waiting
> on condition [0x000000019b124000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e9610> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
>
> "Service Thread" #8 daemon prio=9 os_prio=31 tid=0x00007faf1c837000
> nid=0x4b03 runnable [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007faf1c816000
> nid=0x4903 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007faf1c809800
> nid=0x4703 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007faf1c818000
> nid=0x4503 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007faf1c078800
> nid=0x4303 runnable [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
>
> "Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007faf1c811000 nid=0x2d03
> in Object.wait() [0x00000001999be000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x0000000168286218> (a java.lang.ref.ReferenceQueue$Lock)
> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
> - locked <0x0000000168286218> (a java.lang.ref.ReferenceQueue$Lock)
> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
> at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
>
> "Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007faf1c810800
> nid=0x2b03 in Object.wait() [0x00000001998bb000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x0000000168285c88> (a java.lang.ref.Reference$Lock)
> at java.lang.Object.wait(Object.java:502)
> at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
> - locked <0x0000000168285c88> (a java.lang.ref.Reference$Lock)
>
> "main" #1 prio=5 os_prio=31 tid=0x00007faf1c800000 nid=0x1b03 waiting on
> condition [0x000000010386e000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000001683e95e0> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at ThrowingTasks.realMain(ThrowingTasks.java:207)
> at ThrowingTasks.main(ThrowingTasks.java:267)
>
> "VM Thread" os_prio=31 tid=0x00007faf1c066000 nid=0x2903 runnable
>
> "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007faf1c80d000
> nid=0x2103 runnable
>
> "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007faf1c012000
> nid=0x2303 runnable
>
> "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007faf1c80e000
> nid=0x2503 runnable
>
> "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007faf1c013000
> nid=0x2703 runnable
>
> "VM Periodic Task Thread" os_prio=31 tid=0x00007faf1c06c800 nid=0x4d03
> waiting on condition
>
> JNI global references: 7
>
>
> On 02/11/2013 04:01, Martin Buchholz wrote:
>
>
>
> Including a jstack output extract might be useful for diagnosis.
>
> I have never seen this test fail. Is there a hint that might allow me
> to reproduce it?
>
>
>
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