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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3844) ASSERT failure in BasePage.unlatch() when running LobStreamsTest
Date Wed, 18 Nov 2009 15:12:39 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779480#action_12779480
] 

Bryan Pendleton commented on DERBY-3844:
----------------------------------------

The two separate calls to getBlob() share the same underlying stream, and the finalizer for
the first blob
object closes the stream out from underneath the second blob? Is that correct?

Could we use a reference-counted wrapper around the stream so that each blob could record
its own "interest" in the blob, and would know when it was the last blob to release the stream,
and thus it was safe to close it?


> ASSERT failure in BasePage.unlatch() when running LobStreamsTest
> ----------------------------------------------------------------
>
>                 Key: DERBY-3844
>                 URL: https://issues.apache.org/jira/browse/DERBY-3844
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.5.1.1
>         Environment: Solaris 10, AMD Opteron with 2 CPUs, Java(TM) SE Runtime Environment
(build 1.6.0_06-b02), Derby trunk revision 686755
>            Reporter: Knut Anders Hatlen
>         Attachments: derby-3844-1a-repro_test.diff
>
>
> I saw this failure when running suites.All to test the patch nested_transaction_v2.diff
which is posted on DERBY-3693. The failure did not occur when I reran the test, and I don't
believe the patch should have any effect on the code that failed. The ASSERT that is triggered
is this one (which indicates that we're trying to unlatch a page that's not latched):
> 		if (SanityManager.DEBUG) {
> 			SanityManager.ASSERT(isLatched());
> 		}
> Here's the full stack trace and thread dump:
> 1) testBlobWrite3Param(org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest)org.apache.derby.shared.common.sanity.AssertFailure:
ASSERT FAILED
> 	at org.apache.derby.shared.common.sanity.SanityManager.ASSERT(SanityManager.java:98)
> 	at org.apache.derby.impl.store.raw.data.BasePage.unlatch(BasePage.java:1319)
> 	at org.apache.derby.impl.store.raw.data.OverflowInputStream.fillByteHolder(OverflowInputStream.java:152)
> 	at org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.read(BufferedByteHolderInputStream.java:44)
> 	at java.io.DataInputStream.read(DataInputStream.java:132)
> 	at org.apache.derby.impl.jdbc.PositionedStoreStream.read(PositionedStoreStream.java:106)
> 	at org.apache.derby.impl.jdbc.AutoPositioningStream.read(AutoPositioningStream.java:113)
> 	at org.apache.derby.impl.jdbc.UpdatableBlobStream.read(UpdatableBlobStream.java:194)
> 	at org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.readBytesFromStream(LobStreamsTest.java:463)
> 	at org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.compareLob2File(LobStreamsTest.java:488)
> 	at org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.testBlobWrite3Param(LobStreamsTest.java:130)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:104)
> 	at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> 	at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
> 	at junit.extensions.TestSetup.run(TestSetup.java:25)
> 	at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
> ---------------
> Stack traces for all live threads:
> Thread name=derby.antiGC id=280 priority=1 state=WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	java.lang.Object.wait(Object.java:485)
> 	org.apache.derby.impl.services.monitor.AntiGC.run(BaseMonitor.java:2217)
> 	java.lang.Thread.run(Thread.java:619)
> Thread name=Signal Dispatcher id=4 priority=9 state=RUNNABLE isdaemon=true
> Thread name=main id=1 priority=5 state=RUNNABLE isdaemon=false
> 	java.lang.Thread.dumpThreads(Native Method)
> 	java.lang.Thread.getAllStackTraces(Thread.java:1477)
> 	org.apache.derby.shared.common.sanity.ThreadDump.getStackDumpString(ThreadDump.java:34)
> 	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	org.apache.derby.shared.common.sanity.AssertFailure$1.run(AssertFailure.java:165)
> 	java.security.AccessController.doPrivileged(Native Method)
> 	org.apache.derby.shared.common.sanity.AssertFailure.dumpThreads(AssertFailure.java:159)
> 	org.apache.derby.shared.common.sanity.AssertFailure.<init>(AssertFailure.java:82)
> 	org.apache.derby.shared.common.sanity.SanityManager.ASSERT(SanityManager.java:98)
> 	org.apache.derby.impl.store.raw.data.BasePage.unlatch(BasePage.java:1319)
> 	org.apache.derby.impl.store.raw.data.OverflowInputStream.fillByteHolder(OverflowInputStream.java:152)
> 	org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.read(BufferedByteHolderInputStream.java:44)
> 	java.io.DataInputStream.read(DataInputStream.java:132)
> 	org.apache.derby.impl.jdbc.PositionedStoreStream.read(PositionedStoreStream.java:106)
> 	org.apache.derby.impl.jdbc.AutoPositioningStream.read(AutoPositioningStream.java:113)
> 	org.apache.derby.impl.jdbc.UpdatableBlobStream.read(UpdatableBlobStream.java:194)
> 	org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.readBytesFromStream(LobStreamsTest.java:463)
> 	org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.compareLob2File(LobStreamsTest.java:488)
> 	org.apache.derbyTesting.functionTests.tests.jdbcapi.LobStreamsTest.testBlobWrite3Param(LobStreamsTest.java:130)
> 	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:104)
> 	junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> 	junit.extensions.TestSetup$1.protect(TestSetup.java:21)
> 	junit.extensions.TestSetup.run(TestSetup.java:25)
> 	org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
> Thread name=derby.rawStoreDaemon id=941 priority=5 state=TIMED_WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	org.apache.derby.impl.services.daemon.BasicDaemon.rest(BasicDaemon.java:571)
> 	org.apache.derby.impl.services.daemon.BasicDaemon.run(BasicDaemon.java:388)
> 	java.lang.Thread.run(Thread.java:619)
> Thread name=Timer-3 id=281 priority=5 state=WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	java.lang.Object.wait(Object.java:485)
> 	java.util.TimerThread.mainLoop(Timer.java:483)
> 	java.util.TimerThread.run(Timer.java:462)
> Thread name=Finalizer id=3 priority=8 state=WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
> 	java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
> 	java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
> Thread name=Reference Handler id=2 priority=10 state=WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	java.lang.Object.wait(Object.java:485)
> 	java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
> Thread name=derby.rawStoreDaemon id=933 priority=5 state=TIMED_WAITING isdaemon=true
> 	java.lang.Object.wait(Native Method)
> 	org.apache.derby.impl.services.daemon.BasicDaemon.rest(BasicDaemon.java:571)
> 	org.apache.derby.impl.services.daemon.BasicDaemon.run(BasicDaemon.java:388)
> 	java.lang.Thread.run(Thread.java:619)
> ---------------

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