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From "Kristian Waagan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5447) Deadlock in AutomaticIndexStatisticsTest.testShutdownWhileScanningThenDelete (BasePage.releaseExclusive and Observable.deleteObserver (BaseContainerHandle))
Date Thu, 06 Oct 2011 11:54:30 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121867#comment-13121867
] 

Kristian Waagan commented on DERBY-5447:
----------------------------------------

The stack for the problem with an insane build:
"index-stat-thread":
	at java.util.Observable.deleteObserver(Observable.java:95)
	- waiting to lock <0x00000000e83304a8> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
	at org.apache.derby.impl.store.raw.data.BasePage.releaseExclusive(BasePage.java:1819)
	- locked <0x00000000e8c9f980> (a org.apache.derby.impl.store.raw.data.StoredPage)
	at org.apache.derby.impl.store.raw.data.CachedPage.releaseExclusive(CachedPage.java:531)
	at org.apache.derby.impl.store.raw.data.StoredPage.releaseExclusive(StoredPage.java:1066)
	at org.apache.derby.impl.store.raw.data.BasePage.unlatch(BasePage.java:1371)
	at org.apache.derby.impl.store.access.btree.ControlRow.release(ControlRow.java:926)
	at org.apache.derby.impl.store.access.btree.BTreeScan.positionAtNextPage(BTreeScan.java:505)
	at org.apache.derby.impl.store.access.btree.BTreeForwardScan.fetchRows(BTreeForwardScan.java:464)
	at org.apache.derby.impl.store.access.btree.BTreeScan.fetchNextGroup(BTreeScan.java:1681)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl$KeyComparator.fetchRows(IndexStatisticsDaemonImpl.java:1221)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.updateIndexStatsMinion(IndexStatisticsDaemonImpl.java:463)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.generateStatistics(IndexStatisticsDaemonImpl.java:323)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.processingLoop(IndexStatisticsDaemonImpl.java:794)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.run(IndexStatisticsDaemonImpl.java:710)
	at java.lang.Thread.run(Thread.java:679)
"main":
	at org.apache.derby.impl.store.raw.data.BasePage.releaseExclusive(BasePage.java:1814)
	- waiting to lock <0x00000000e8c9f980> (a org.apache.derby.impl.store.raw.data.StoredPage)
	at org.apache.derby.impl.store.raw.data.CachedPage.releaseExclusive(CachedPage.java:531)
	at org.apache.derby.impl.store.raw.data.StoredPage.releaseExclusive(StoredPage.java:1066)
	at org.apache.derby.impl.store.raw.data.BasePage.update(BasePage.java:1625)
	at java.util.Observable.notifyObservers(Observable.java:159)
	at java.util.Observable.notifyObservers(Observable.java:115)
	at org.apache.derby.impl.store.raw.data.BaseContainerHandle.informObservers(BaseContainerHandle.java:1008)
	at org.apache.derby.impl.store.raw.data.BaseContainerHandle.close(BaseContainerHandle.java:414)
	- locked <0x00000000e83304a8> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
	at org.apache.derby.impl.store.access.btree.OpenBTree.close(OpenBTree.java:490)
	at org.apache.derby.impl.store.access.btree.BTreeScan.closeForEndTransaction(BTreeScan.java:2021)
	at org.apache.derby.impl.store.access.btree.index.B2IForwardScan.closeForEndTransaction(B2IForwardScan.java:107)
	at org.apache.derby.impl.store.access.RAMTransaction.closeControllers(RAMTransaction.java:245)
	at org.apache.derby.impl.store.access.RAMTransactionContext.cleanupOnError(RAMTransactionContext.java:97)
	at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(ContextManager.java:343)
	at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.stop(IndexStatisticsDaemonImpl.java:919)
	- locked <0x00000000e78b35b0> (a java.util.ArrayList)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.disableIndexStatsRefresher(DataDictionaryImpl.java:13891)
	at org.apache.derby.impl.db.DatabaseContextImpl.cleanupOnError(DatabaseContextImpl.java:69)
	at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(ContextManager.java:343)
	at org.apache.derby.impl.jdbc.TransactionResourceImpl.cleanupOnError(TransactionResourceImpl.java:437)
	at org.apache.derby.impl.jdbc.EmbedConnection.<init>(EmbedConnection.java:633)
	at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(EmbedConnection30.java:73)
	at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(EmbedConnection40.java:51)
	at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Driver40.java:70)
	at org.apache.derby.jdbc.InternalDriver.connect(InternalDriver.java:248)
	at org.apache.derby.jdbc.EmbeddedDataSource.getConnection(EmbeddedDataSource.java:480)
	at org.apache.derby.jdbc.EmbeddedDataSource.getConnection(EmbeddedDataSource.java:424)
	at org.apache.derbyTesting.junit.JDBCDataSource.shutdownDatabase(JDBCDataSource.java:266)
	at org.apache.derbyTesting.functionTests.tests.store.AutomaticIndexStatisticsTest.testShutdownWhileScanningThenDelete(AutomaticIndexStatisticsTest.java:187)

                
> Deadlock in AutomaticIndexStatisticsTest.testShutdownWhileScanningThenDelete (BasePage.releaseExclusive
and Observable.deleteObserver (BaseContainerHandle))
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5447
>                 URL: https://issues.apache.org/jira/browse/DERBY-5447
>             Project: Derby
>          Issue Type: Bug
>          Components: Services
>    Affects Versions: 10.9.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Critical
>
> Java deadlock involving BasePage.releaseExclusive and Observable.deleteObserver, the
observable being a BaseContainerHandle instance, seen when running  AutomaticIndexStatisticsTest.testShutdownWhileScanningThenDelete.
> The activities involved are a scan of a conglomerate and the index statistics daemon
being stopped as part of the database shutdown.
> Here are the relevant parts of the stack trace:
> "index-stat-thread" daemon prio=10 tid=0x00007f4e34244000 nid=0x380b waiting for monitor
entry [0x00007f4e30aef000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
>         at java.util.Observable.deleteObserver(Observable.java:95)
>         - waiting to lock <0x00000000f51132d0> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
>         at org.apache.derby.impl.store.raw.data.BasePage.releaseExclusive(BasePage.java:1819)
>         - locked <0x00000000f6d5a280> (a org.apache.derby.impl.store.raw.data.StoredPage)
>         at org.apache.derby.impl.store.raw.data.CachedPage.releaseExclusive(CachedPage.java:531)
>         at org.apache.derby.impl.store.raw.data.StoredPage.releaseExclusive(StoredPage.java:1066)
>         at org.apache.derby.impl.store.raw.data.BasePage.unlatch(BasePage.java:1371)
>         at org.apache.derby.impl.store.access.btree.ControlRow.release(ControlRow.java:926)
>         at org.apache.derby.impl.store.access.btree.BTreeScan.savePositionAndReleasePage(BTreeScan.java:2146)
>         at org.apache.derby.impl.store.access.btree.BTreeForwardScan.fetchRows(BTreeForwardScan.java:442)
>         at org.apache.derby.impl.store.access.btree.BTreeScan.fetchNextGroup(BTreeScan.java:1681)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl$KeyComparator.fetchRows(IndexStatisticsDaemonImpl.java:1221)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.updateIndexStatsMinion(IndexStatisticsDaemonImpl.java:463)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.generateStatistics(IndexStatisticsDaemonImpl.java:323)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.processingLoop(IndexStatisticsDaemonImpl.java:794)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.run(IndexStatisticsDaemonImpl.java:710)
>         at java.lang.Thread.run(Thread.java:679)
> "main":
>         at org.apache.derby.impl.store.raw.data.BasePage.isLatched(BasePage.java:1383)
>         - waiting to lock <0x00000000f6d5a280> (a org.apache.derby.impl.store.raw.data.StoredPage)
>         at org.apache.derby.impl.store.raw.data.BasePage.update(BasePage.java:1621)
>         at java.util.Observable.notifyObservers(Observable.java:159)
>         at java.util.Observable.notifyObservers(Observable.java:115)
>         at org.apache.derby.impl.store.raw.data.BaseContainerHandle.informObservers(BaseContainerHandle.java:1008)
>         at org.apache.derby.impl.store.raw.data.BaseContainerHandle.close(BaseContainerHandle.java:414)
>         - locked <0x00000000f51132d0> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
>         at org.apache.derby.impl.store.access.btree.OpenBTree.close(OpenBTree.java:490)
>         at org.apache.derby.impl.store.access.btree.BTreeScan.closeForEndTransaction(BTreeScan.java:2021)
>         at org.apache.derby.impl.store.access.btree.index.B2IForwardScan.closeForEndTransaction(B2IForwardScan.java:107)
>         at org.apache.derby.impl.store.access.RAMTransaction.closeControllers(RAMTransaction.java:245)
>         at org.apache.derby.impl.store.access.RAMTransactionContext.cleanupOnError(RAMTransactionContext.java:97)
>         at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(ContextManager.java:343)
>         at org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.stop(IndexStatisticsDaemonImpl.java:919)
>         - locked <0x00000000f4a5a070> (a java.util.ArrayList)
>         at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.disableIndexStatsRefresher(DataDictionaryImpl.java:13891)
>         at org.apache.derby.impl.db.DatabaseContextImpl.cleanupOnError(DatabaseContextImpl.java:69)
>         at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(ContextManager.java:343)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.cleanupOnError(TransactionResourceImpl.java:437)
>         at org.apache.derby.impl.jdbc.EmbedConnection.<init>(EmbedConnection.java:633)
>         at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(EmbedConnection30.java:73)
>         at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(EmbedConnection40.java:51)
>         at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Driver40.java:70)
>         at org.apache.derby.jdbc.InternalDriver.connect(InternalDriver.java:248)
>         at org.apache.derby.jdbc.EmbeddedDataSource.getConnection(EmbeddedDataSource.java:480)
>         at org.apache.derby.jdbc.EmbeddedDataSource.getConnection(EmbeddedDataSource.java:424)
>         at org.apache.derbyTesting.junit.JDBCDataSource.shutdownDatabase(JDBCDataSource.java:266)
>         at org.apache.derbyTesting.functionTests.tests.store.AutomaticIndexStatisticsTest.testShutdownWhileScanningThenDelete(AutomaticIndexStatisticsTest.java:187)
> I have access to a machine on which this can be reproduced pretty simple. It's an Intel(R)
Core(TM)2 Duo CPU E8500 @ 3.16GHz running Fedora 15.
> Java is:
> OpenJDK Runtime Environment (IcedTea6 1.10.2) (fedora-58.1.10.2.fc15-x86_64)
> OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
> In a way this bug is critical, since it causes two threads to hang forever. However,
for it to happen the database must be shut down while the index statistics daemon is doing
work and the timing must be right. There may be other ways to trigger the bug where Observable.update
and BasePage.releaseExclusive are involved.

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