db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3786) Assert failure in CacheEntry.unkeepForRemove when running stress.multi
Date Mon, 21 Jul 2008 10:39:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615206#action_12615206
] 

Knut Anders Hatlen commented on DERBY-3786:
-------------------------------------------

It looks like one thread calls ConcurrentCache.remove() while another thread is blocked inside
the same method. According to the javadoc for CacheManager.remove(), callers of remove() must
synchronize so that no two threads try to remove the same object concurrently:

	/**
		Delete and remove an object from the cache. It is up to the user of the cache
		to provide synchronization of some form that ensures that only one caller
		executes remove() on a cached object.
		<BR>

> Assert failure in CacheEntry.unkeepForRemove when running stress.multi
> ----------------------------------------------------------------------
>
>                 Key: DERBY-3786
>                 URL: https://issues.apache.org/jira/browse/DERBY-3786
>             Project: Derby
>          Issue Type: Bug
>          Components: Services
>    Affects Versions: 10.5.0.0
>         Environment: 32 hardware execution threads
>            Reporter: Kristian Waagan
>            Priority: Minor
>
> When running stress.multi on a machine with 32 hardware execution threads, I observed
the following assert failure in two independent runs:
> -----
> 2008-07-18 02:15:14.415 GMT Thread[Thread-8,5,workers] (XID = 94699), (SESSIONID = 16923),
(DATABASE = mydb), (DRDAID = null), Failed Statement is: insert into a values (1)
> 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.services.cache.CacheEntry.unkeepForRemove(CacheEntry.java:217)
>         at org.apache.derby.impl.services.cache.ConcurrentCache.remove(ConcurrentCache.java:446)
>         at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.removeStatement(GenericLanguageConnectionContext.java:898)
>         at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:516)
>         at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:88)
>         at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:794)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:606)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:555)
>         at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:329)
>         at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:508)
>         at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:350)
>         at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:248)
>         at org.apache.derby.impl.tools.ij.mtTestCase.runMe(mtTestCase.java:246)
>         at org.apache.derby.impl.tools.ij.mtTester.run(mtTester.java:91)
>         at java.lang.Thread.run(Thread.java:619)
> Cleanup action completed
> -----
> In stress.log:
> -----
> Tester8: insert2 Fri Jul 18 04:15:12 CEST 2008
> Tester6: TERMINATING due to unexpected error:
> FatalException: XJ001: Java exception: 'ASSERT FAILED: org.apache.derby.shared.common.sanity.AssertFailure'.
> Tester1: SELECT2 Fri Jul 18 04:15:13 CEST 2008
> Tester8: stopping on request after 820 iterations
> Tester10: stopping on request after 859 iterations
> Tester1: stopping on request after 847 iterations
> Tester7: TERMINATING due to unexpected error:
> FatalException: XJ001: Java exception: 'ASSERT FAILED: org.apache.derby.shared.common.sanity.AssertFailure'.
> Tester9: stopping on request after 722 iterations
> Tester3: stopping on request after 880 iterations
> Tester5: stopping on request after 858 iterations
> Tester4: stopping on request after 839 iterations
> WARNING: testers didn't die willingly, so I'm going to kill 'em.
>         This may result in connection resources that aren't cleaned up
>         (e.g. you may see problems in the final script run with deadlocks).
> -----
> A few runs on a similar but slightly slower machine didn't experience the same failure,
so the bug is likely timing dependent.
> I'll perform some more runs and see how hard it is to reproduce.
> I haven't investigated what will happen in an insane build.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message