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<TITLE> [Mono-bugs] [Bug 477049] New: Using XmlNode.SelectSingleNode with multiple threads almost always fails and throws an Exception.
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<H1>[Mono-bugs] [Bug 477049] New: Using XmlNode.SelectSingleNode with multiple threads almost always fails and throws an Exception.</H1>
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<B>bugzilla_noreply at novell.com</B>
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<A HREF="mailto:mono-bugs%40lists.ximian.com?Subject=%5BMono-bugs%5D%20%5BBug%20477049%5D%20New%3A%20Using%20XmlNode.SelectSingleNode%20with%0A%20multiple%20threads%20almost%20always%20fails%20and%20throws%20an%20Exception.&In-Reply-To="
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TITLE="[Mono-bugs] [Bug 477049] New: Using XmlNode.SelectSingleNode with multiple threads almost always fails and throws an Exception.">bugzilla_noreply at novell.com
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</A><BR>
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<I>Wed Feb 18 11:57:42 EST 2009</I>
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<PRE><A HREF="https://bugzilla.novell.com/show_bug.cgi?id=477049">https://bugzilla.novell.com/show_bug.cgi?id=477049</A>
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Summary: Using XmlNode.SelectSingleNode with multiple threads
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almost always fails and throws an Exception.
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Classification: Mono
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Product: Mono: Class Libraries
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Version: 2.4.x
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Platform: All
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OS/Version: Windows XP
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Status: NEW
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Severity: Normal
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Priority: P5 - None
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Component: Sys.XML
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AssignedTo: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">atsushi at ximian.com</A>
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ReportedBy: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">Vernish13 at gmail.com</A>
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QAContact: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at lists.ximian.com</A>
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Found By: ---
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Created an attachment (id=273657)
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--> (<A HREF="https://bugzilla.novell.com/attachment.cgi?id=273657">https://bugzilla.novell.com/attachment.cgi?id=273657</A>)
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Includes Test.cs and TestFile.xml
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User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.0.6)
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Gecko/2009011913 Firefox/3.0.6
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Start multiple threads and each creates its own XmlDocument from the same file.
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Then each of those threads starts multiple threads to read their XmlDocument.
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While reading each thread uses XmlNode.SelectSingleNode(). SelectSingleNode
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will very frequently return null when it should have returned an XmlNode.
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Sometimes an Assertion Exception will be thrown also.
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Reproducible: Always
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Steps to Reproduce:
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1. Extract the attached zip file. It should contain Test.cs and TestFile.xml
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2. Compile Test.cs. Using gmcs or csc. Ex. csc Test.cs
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3. Run at the console ( >mono Test.exe ). If it completes successfully, run
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it again.
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Actual Results:
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Actual Results Vary. I have seen it complete successfully, but normally one of
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the errors below occurs.
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Most Common Is :
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Unhandled Exception: System.NullReferenceException: Object reference not set to
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an instance of an object
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at System.Xml.XPath.CompiledExpression.EvaluateNodeSet
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(System.Xml.XPath.BaseI
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terator iter) [0x00000]
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at System.Xml.XPath.XPathNavigator.Select (System.Xml.XPath.XPathExpression
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ex
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pr, IXmlNamespaceResolver ctx) [0x00000]
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at System.Xml.XPath.XPathNavigator.Select (System.Xml.XPath.XPathExpression
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ex
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pr) [0x00000]
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at System.Xml.XmlNode.SelectSingleNode (System.String xpath,
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System.Xml.XmlNam
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espaceManager nsmgr) [0x00000]
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at System.Xml.XmlNode.SelectSingleNode (System.String xpath) [0x00000]
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at SelectNodeTests.Program.RepeatedMetadataNodeLookUp
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(SelectNodeTests.ThreadR
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eadData data) [0x00000]
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at SelectNodeTests.Program.ReadDocument (System.Object arg) [0x00000]
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This has happened a couple times :
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System.Xml.XPath.NullIterator doesn't implement interface
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System.IFormatProvider
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* Assertion: should not be reached at ..\mono\mini\mini-trampolines.c:67
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This application has requested the Runtime to terminate it in an unusual way.
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Please contact the application's support team for more information.
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Expected Results:
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"Done" Displayed on the console.
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--
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Configure bugmail: <A HREF="https://bugzilla.novell.com/userprefs.cgi?tab=email">https://bugzilla.novell.com/userprefs.cgi?tab=email</A>
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------- You are receiving this mail because: -------
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You are the QA contact for the bug.
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</PRE>
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