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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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