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  1. Qt
  2. QTBUG-22930

QMetaType::construct deadlocks if qRegisterMetaType is called during construction

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Details

    • Bug
    • Resolution: Done
    • Not Evaluated
    • 5.0.0
    • 5.0.0
    • Core: Object Model
    • None
    • qtbase b36a40ac0d17fea0b299630f3e3d4174eb7ce1a9
      Ubuntu 10.04 32-bit

    Description

      If QMetaType::construct is called with a custom type, and the custom type's constructor executes a qRegisterMetaType, that qRegisterMetaType will hang indefinitely. It may be a deadlock attempting to lock a mutex which is already locked by the current thread.

      Here is a sample backtrace, taken from tst_qxmlquery, which hangs due to this issue:

          QObject::connect: Cannot connect (null)::destroyed() to QHostInfoLookupManager::waitForThreadPoolDone()
    ********* Start testing of tst_QXmlQuery *********
    Config: Using QTest library 5.0.0, Qt 5.0.0
    PASS   : tst_QXmlQuery::initTestCase()
    PASS   : tst_QXmlQuery::defaultConstructor()
    PASS   : tst_QXmlQuery::copyConstructor()
    PASS   : tst_QXmlQuery::constructorQXmlNamePool()
    PASS   : tst_QXmlQuery::constructorQXmlNamePoolQueryLanguage()
    PASS   : tst_QXmlQuery::constructorQXmlNamePoolWithinQSimpleXmlNodeModel()
    PASS   : tst_QXmlQuery::assignmentOperator()
    PASS   : tst_QXmlQuery::isValid()
    PASS   : tst_QXmlQuery::sequentialExecution()
    PASS   : tst_QXmlQuery::bindVariableQString()
    PASS   : tst_QXmlQuery::bindVariableQStringNoExternalDeclaration()
    PASS   : tst_QXmlQuery::bindVariableQXmlName()
    PASS   : tst_QXmlQuery::bindVariableQXmlNameTriggerWarnings()
    PASS   : tst_QXmlQuery::bindVariableQStringQIODevice()
    PASS   : tst_QXmlQuery::bindVariableQStringQIODeviceWithByteArray()
    PASS   : tst_QXmlQuery::bindVariableQStringQIODeviceWithString()
    PASS   : tst_QXmlQuery::bindVariableQStringQIODeviceWithQFile()
    PASS   : tst_QXmlQuery::bindVariableQXmlNameQIODevice()
    PASS   : tst_QXmlQuery::bindVariableQXmlNameQIODeviceTriggerWarnings()
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    Warning in : The variable paramSelectWithTypeIntBoundWithBindVariableRequired is unused
    PASS   : tst_QXmlQuery::bindVariableXSLTSuccess()
    PASS   : tst_QXmlQuery::bindVariableTemporaryNode()
    PASS   : tst_QXmlQuery::setMessageHandler()
    PASS   : tst_QXmlQuery::messageHandler()
    PASS   : tst_QXmlQuery::evaluateToQAbstractXmlReceiverTriggerWarnings()
    PASS   : tst_QXmlQuery::evaluateToQXmlResultItems()
    PASS   : tst_QXmlQuery::evaluateToQXmlResultItemsTriggerWarnings()
    PASS   : tst_QXmlQuery::evaluateToQXmlResultItemsErrorAtEnd()
    PASS   : tst_QXmlQuery::evaluateToReceiver()
    PASS   : tst_QXmlQuery::evaluateToReceiverOnInvalidQuery()
    PASS   : tst_QXmlQuery::evaluateToQStringTriggerError()
    PASS   : tst_QXmlQuery::evaluateToQString()
    PASS   : tst_QXmlQuery::evaluateToQStringSignature()
    PASS   : tst_QXmlQuery::checkGeneratedBaselines()
    PASS   : tst_QXmlQuery::basicXQueryToQtTypeCheck()
    PASS   : tst_QXmlQuery::basicQtToXQueryTypeCheck()
    PASS   : tst_QXmlQuery::bindNode()
    PASS   : tst_QXmlQuery::relativeBaseURI()
    PASS   : tst_QXmlQuery::emptyBaseURI()
    PASS   : tst_QXmlQuery::roundTripDateWithinQXmlItem()
    PASS   : tst_QXmlQuery::bindingMissing()
    PASS   : tst_QXmlQuery::bindDefaultConstructedItem()
    PASS   : tst_QXmlQuery::bindEmptyNullString()
    PASS   : tst_QXmlQuery::bindEmptyString()
    PASS   : tst_QXmlQuery::rebindVariableSameType()
    PASS   : tst_QXmlQuery::rebindVariableDifferentType()
    PASS   : tst_QXmlQuery::rebindVariableWithNullItem()
    PASS   : tst_QXmlQuery::eraseQXmlItemBinding()
    PASS   : tst_QXmlQuery::eraseDeviceBinding()
    PASS   : tst_QXmlQuery::constCorrectness()
    PASS   : tst_QXmlQuery::objectSize()
    PASS   : tst_QXmlQuery::setUriResolver()
    PASS   : tst_QXmlQuery::uriResolver()
    PASS   : tst_QXmlQuery::messageXML()
    PASS   : tst_QXmlQuery::resultItemsDeallocatedQuery()
    PASS   : tst_QXmlQuery::copyCheckMessageHandler()
    PASS   : tst_QXmlQuery::shadowedVariables()
    PASS   : tst_QXmlQuery::setFocusQXmlItem()
    PASS   : tst_QXmlQuery::setFocusQUrl()
    PASS   : tst_QXmlQuery::setFocusQIODevice()
    PASS   : tst_QXmlQuery::setFocusQIODeviceAvoidVariableClash()
    PASS   : tst_QXmlQuery::setFocusQIODeviceFailure()
    PASS   : tst_QXmlQuery::setFocusQIODeviceTriggerWarnings()
    PASS   : tst_QXmlQuery::setFocusQString()
    PASS   : tst_QXmlQuery::setFocusQStringFailure()
    PASS   : tst_QXmlQuery::setFocusQStringSignature()
    PASS   : tst_QXmlQuery::recompilationWithEvaluateToResultFailing()
    PASS   : tst_QXmlQuery::secondEvaluationWithEvaluateToResultFailing()
    PASS   : tst_QXmlQuery::recompilationWithEvaluateToReceiver()
    PASS   : tst_QXmlQuery::fnDocOnQIODeviceTimeout()
    PASS   : tst_QXmlQuery::evaluateToQStringListOnInvalidQuery()
    PASS   : tst_QXmlQuery::evaluateToQStringList()
    PASS   : tst_QXmlQuery::evaluateToQStringListTriggerWarnings()
    PASS   : tst_QXmlQuery::evaluateToQStringListNoConversion()
    PASS   : tst_QXmlQuery::evaluateToQIODevice()
    PASS   : tst_QXmlQuery::evaluateToQIODeviceTriggerWarnings()
    PASS   : tst_QXmlQuery::evaluateToQIODeviceSignature()
    PASS   : tst_QXmlQuery::evaluateToQIODeviceOnInvalidQuery()
    PASS   : tst_QXmlQuery::setQueryQIODeviceQUrl()
    PASS   : tst_QXmlQuery::setQueryQIODeviceQUrlTriggerWarnings()
    PASS   : tst_QXmlQuery::setQueryQString()
    PASS   : tst_QXmlQuery::setQueryQUrlSuccess()
    PASS   : tst_QXmlQuery::setQueryQUrlFailSucceed()
    PASS   : tst_QXmlQuery::setQueryQUrlFailure()
    PASS   : tst_QXmlQuery::setQueryQUrlBaseURI()
    PASS   : tst_QXmlQuery::setQueryWithNonExistentQUrlOnValidQuery()
    PASS   : tst_QXmlQuery::setQueryWithInvalidQueryFromQUrlOnValidQuery()
    PASS   : tst_QXmlQuery::retrieveNameFromQuery()
    PASS   : tst_QXmlQuery::declareUnavailableExternal()
    PASS   : tst_QXmlQuery::msvcCacheIssue()
    PASS   : tst_QXmlQuery::unavailableExternalVariable()
    PASS   : tst_QXmlQuery::useUriResolver()
    PASS   : tst_QXmlQuery::queryWithFocusAndVariable()
    PASS   : tst_QXmlQuery::undefinedFocus()
    PASS   : tst_QXmlQuery::basicFocusUsage()
    PASS   : tst_QXmlQuery::queryLanguage()
    PASS   : tst_QXmlQuery::queryLanguageSignature()
    PASS   : tst_QXmlQuery::enumQueryLanguage()
    PASS   : tst_QXmlQuery::setNetworkAccessManager()
    PASS   : tst_QXmlQuery::networkAccessManagerSignature()
    PASS   : tst_QXmlQuery::networkAccessManagerDefaultValue()
    PASS   : tst_QXmlQuery::networkAccessManager()
    PASS   : tst_QXmlQuery::setInitialTemplateNameQXmlName()
    PASS   : tst_QXmlQuery::setInitialTemplateNameQXmlNameSignature()
    PASS   : tst_QXmlQuery::setInitialTemplateNameQString()
    PASS   : tst_QXmlQuery::setInitialTemplateNameQStringSignature()
    PASS   : tst_QXmlQuery::initialTemplateName()
    PASS   : tst_QXmlQuery::initialTemplateNameSignature()
    PASS   : tst_QXmlQuery::fnDocNetworkAccessSuccess()
    PASS   : tst_QXmlQuery::fnDocNetworkAccessFailure()
    PASS   : tst_QXmlQuery::multipleDocsAndFocus()
    PASS   : tst_QXmlQuery::multipleEvaluationsWithDifferentFocus()
    QtQA::App::TestRunner: Timed out after 900 seconds
    QtQA::App::TestRunner: Process exited due to signal 6; dumped core
    QtQA::App::TestRunner: ============================== backtrace follows: ==============================
    QtQA::App::TestRunner: gdb commands: thread apply all bt 100
    QtQA::App::TestRunner: [New Thread 11974]
    QtQA::App::TestRunner:
    QtQA::App::TestRunner: warning: Can't read pathname for load map: Input/output error.
    QtQA::App::TestRunner: Core was generated by `./tst_qxmlquery -o /home/qt/.pulse2-agent/data/recipes/147588207/base/_artifact'.
    QtQA::App::TestRunner: Program terminated with signal 6, Aborted.
    QtQA::App::TestRunner: #0  0x4001d430 in __kernel_vsyscall ()
    QtQA::App::TestRunner:
    QtQA::App::TestRunner: Thread 1 (Thread 11974):
    QtQA::App::TestRunner: #0  0x4001d430 in __kernel_vsyscall ()
    QtQA::App::TestRunner: #1  0x40bde651 in *__GI_raise (sig=6)
    QtQA::App::TestRunner:     at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
    QtQA::App::TestRunner: #2  0x40be1a82 in *__GI_abort () at abort.c:92
    QtQA::App::TestRunner: #3  0x406be8fd in qt_message_output (msgType=QtFatalMsg,
    QtQA::App::TestRunner:     buf=0x42400dc0 "Received signal 15") at global/qglobal.cpp:2111
    QtQA::App::TestRunner: #4  0x406beaf6 in qt_message (msgType=QtFatalMsg,
    QtQA::App::TestRunner:     msg=0x4003e840 "Received signal %d", ap=0xbfe521c4 "\017")
    QtQA::App::TestRunner:     at global/qglobal.cpp:2157
    QtQA::App::TestRunner: #5  0x406bee5f in qFatal (msg=0x4003e840 "Received signal %d")
    QtQA::App::TestRunner:     at global/qglobal.cpp:2335
    QtQA::App::TestRunner: #6  0x4002ab15 in QTest::FatalSignalHandler::signal (signum=15)
    QtQA::App::TestRunner:     at qtestcase.cpp:1781
    QtQA::App::TestRunner: #7  <signal handler called>
    QtQA::App::TestRunner: #8  0x4001d430 in __kernel_vsyscall ()
    QtQA::App::TestRunner: #9  0x40a69015 in pthread_cond_wait@@GLIBC_2.3.2 ()
    QtQA::App::TestRunner:     at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
    QtQA::App::TestRunner: #10 0x406ca9e5 in QWaitConditionPrivate::wait (this=0x9507950,
    QtQA::App::TestRunner:     time=4294967295) at thread/qwaitcondition_unix.cpp:86
    QtQA::App::TestRunner: #11 0x406ca7ea in QWaitCondition::wait (this=0x95078d8, mutex=0x95078d0,
    QtQA::App::TestRunner:     time=4294967295) at thread/qwaitcondition_unix.cpp:158
    QtQA::App::TestRunner: #12 0x406c3b39 in QReadWriteLock::lockForWrite (this=0x95078c0)
    QtQA::App::TestRunner:     at thread/qreadwritelock.cpp:293
    QtQA::App::TestRunner: #13 0x4075e030 in QWriteLocker::relock (this=0xbfe528a0)
    QtQA::App::TestRunner:     at ../../include/QtCore/../../src/corelib/thread/qreadwritelock.h:155
    QtQA::App::TestRunner: #14 0x4075e0b6 in QWriteLocker (this=0xbfe528a0, areadWriteLock=0x95078c0)
    QtQA::App::TestRunner:     at ../../include/QtCore/../../src/corelib/thread/qreadwritelock.h:175
    QtQA::App::TestRunner: #15 0x40809856 in QMetaType::registerType (
    QtQA::App::TestRunner:     typeName=0x405d37b0 "QNetworkReply::NetworkError",
    QtQA::App::TestRunner:     deleter=0x4051136e <void qMetaTypeDeleteHelper<QNetworkReply::NetworkError>(QNetworkReply::NetworkError*)>,
    QtQA::App::TestRunner:     creator=0x40511325 <void* qMetaTypeCreateHelper<QNetworkReply::NetworkError>(QNetworkReply::NetworkError const*)>,
    QtQA::App::TestRunner:     destructor=0x405113e8 <void qMetaTypeDestructHelper<QNetworkReply::NetworkError>(QNetworkReply::NetworkError*)>,
    QtQA::App::TestRunner:     constructor=0x40511391 <void* qMetaTypeConstructHelper<QNetworkReply::NetworkError>(void*, QNetworkReply::NetworkError const*)>, size=4)
    QtQA::App::TestRunner:     at kernel/qmetatype.cpp:449
    QtQA::App::TestRunner: #16 0x4051076a in qRegisterMetaType<QNetworkReply::NetworkError> (
    QtQA::App::TestRunner:     typeName=0x405d37b0 "QNetworkReply::NetworkError", dummy=0x0)
    QtQA::App::TestRunner:     at ../../include/QtCore/../../src/corelib/kernel/qmetatype.h:341
    QtQA::App::TestRunner: #17 0x4050c20f in QNetworkAccessManager (this=0x42406770, parent=0x42401dd8)
    QtQA::App::TestRunner:     at access/qnetworkaccessmanager.cpp:346
    QtQA::App::TestRunner: #18 0x400c5f16 in URILoader (this=0x42406770, parent=0x42401dd8, np=...,
    QtQA::App::TestRunner:     l=...) at api/quriloader.cpp:57
    QtQA::App::TestRunner: #19 0x400cb4b4 in QXmlQueryPrivate::detach() ()
    QtQA::App::TestRunner:    from /home/qt/.pulse2-agent/data/recipes/147588207/base/qt/qtbase/lib/libQtXmlPatterns.so.5
    QtQA::App::TestRunner: #20 0x400c9241 in QXmlQuery (this=0xbfe52c60, other=...)
    QtQA::App::TestRunner:     at api/qxmlquery.cpp:272
    QtQA::App::TestRunner: #21 0x400b6c87 in qMetaTypeConstructHelper<QXmlQuery> (where=0xbfe52c60,
    QtQA::App::TestRunner:     t=0xbfe52d1c)
    QtQA::App::TestRunner:     at ../../../qtbase/include/QtCore/../../src/corelib/kernel/qmetatype.h:274
    QtQA::App::TestRunner: #22 0x408108e1 in customTypeConstructor (type=266, where=0xbfe52c60,
    QtQA::App::TestRunner:     copy=0xbfe52d1c) at kernel/qmetatype.cpp:1437
    QtQA::App::TestRunner: #23 0x4080d814 in delegate (this=0xbfe52b28, copy=0xbfe52d1c)
    QtQA::App::TestRunner:     at kernel/qmetatype.cpp:1426
    QtQA::App::TestRunner: #24 0x4080c225 in switcher<void*, <unnamed>::TypeConstructor<<unnamed>::DefinedTypesFilter> > (logic=..., type=266, data=0xbfe52d1c)
    QtQA::App::TestRunner:     at kernel/qmetatypeswitcher_p.h:94
    QtQA::App::TestRunner: #25 0x4080bb95 in QMetaType::construct (type=266, where=0xbfe52c60,
    QtQA::App::TestRunner:     copy=0xbfe52d1c) at kernel/qmetatype.cpp:1476
    QtQA::App::TestRunner: #26 0x4084080a in delegate (this=0xbfe52ba8)
    QtQA::App::TestRunner:     at ../../include/QtCore/5.0.0/QtCore/private/../../../../../src/corelib/kernel/qvariant_p.h:366
    QtQA::App::TestRunner: #27 0x4083edbd in switcher<void, QVariantConstructor<<unnamed>::CoreTypesFilter> > (logic=..., type=266, data=0x0)
    QtQA::App::TestRunner:     at ../../include/QtCore/5.0.0/QtCore/private/../../../../../src/corelib/kernel/qmetatypeswitcher_p.h:94
    QtQA::App::TestRunner: #28 0x408389eb in construct (x=0xbfe52c60, copy=0xbfe52d1c)
    QtQA::App::TestRunner:     at kernel/qvariant.cpp:108
    QtQA::App::TestRunner: #29 0x4083b5e7 in QVariant::create (this=0xbfe52c60, type=266,
    QtQA::App::TestRunner:     copy=0xbfe52d1c) at kernel/qvariant.cpp:1021
    QtQA::App::TestRunner: #30 0x4083bbb6 in QVariant (this=0xbfe52c60, typeOrUserType=266,
    QtQA::App::TestRunner:     copy=0xbfe52d1c, flags=0) at kernel/qvariant.cpp:1311
    QtQA::App::TestRunner: #31 0x400cd66b in QVariant qVariantFromValue<QXmlQuery>(QXmlQuery const&) ()
    QtQA::App::TestRunner:    from /home/qt/.pulse2-agent/data/recipes/147588207/base/qt/qtbase/lib/libQtXmlPatterns.so.5
    QtQA::App::TestRunner: #32 0x400cd2d7 in QVariant QVariant::fromValue<QXmlQuery>(QXmlQuery const&) ()
    QtQA::App::TestRunner:    from /home/qt/.pulse2-agent/data/recipes/147588207/base/qt/qtbase/lib/libQtXmlPatterns.so.5
    QtQA::App::TestRunner: #33 0x400cac5a in QXmlQuery::bindVariable (this=0xbfe52d14, name=...,
    QtQA::App::TestRunner:     query=...) at api/qxmlquery.cpp:1187
    QtQA::App::TestRunner: #34 0x400cad70 in QXmlQuery::bindVariable (this=0xbfe52d14, localName=...,
    QtQA::App::TestRunner:     query=...) at api/qxmlquery.cpp:1206
    QtQA::App::TestRunner: #35 0x0806ec72 in tst_QXmlQuery::bindVariableQXmlQuery (this=0xbfe536e4)
    QtQA::App::TestRunner:     at tst_qxmlquery.cpp:3200
    QtQA::App::TestRunner: #36 0x0807185a in tst_QXmlQuery::qt_static_metacall (_o=0xbfe536e4,
    QtQA::App::TestRunner:     _c=QMetaObject::InvokeMetaMethod, _id=121, _a=0xbfe52dc0)
    QtQA::App::TestRunner:     at .moc/debug-shared/tst_qxmlquery.moc:403
    QtQA::App::TestRunner: #37 0x40805dfc in QMetaMethod::invoke (this=0xbfe52f2c, object=0xbfe536e4,
    QtQA::App::TestRunner:     connectionType=Qt::DirectConnection, returnValue=..., val0=..., val1=...,
    QtQA::App::TestRunner:     val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=...,
    QtQA::App::TestRunner:     val9=...) at kernel/qmetaobject.cpp:1650
    QtQA::App::TestRunner: #38 0x4080521e in QMetaObject::invokeMethod (obj=0xbfe536e4,
    QtQA::App::TestRunner:     member=0x424055c0 "bindVariableQXmlQuery", type=Qt::DirectConnection,
    QtQA::App::TestRunner:     ret=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=...,
    QtQA::App::TestRunner:     val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:1192
    QtQA::App::TestRunner: #39 0x4002c794 in QMetaObject::invokeMethod (obj=0xbfe536e4,
    QtQA::App::TestRunner:     member=0x424055c0 "bindVariableQXmlQuery", type=Qt::DirectConnection,
    QtQA::App::TestRunner:     val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=...,
    QtQA::App::TestRunner:     val7=..., val8=..., val9=...)
    QtQA::App::TestRunner:     at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs.h:407
    QtQA::App::TestRunner: #40 0x40029caa in qInvokeTestMethodDataEntry (
    QtQA::App::TestRunner:     slot=0x424055c0 "bindVariableQXmlQuery") at qtestcase.cpp:1493
    QtQA::App::TestRunner: #41 0x4002a2b2 in qInvokeTestMethod (
    QtQA::App::TestRunner:     slotName=0x807d850 "bindVariableQXmlQuery()", data=0x0)
    QtQA::App::TestRunner:     at qtestcase.cpp:1594
    QtQA::App::TestRunner: #42 0x4002aa63 in qInvokeTestMethods (testObject=0xbfe536e4)
    QtQA::App::TestRunner:     at qtestcase.cpp:1748
    QtQA::App::TestRunner: #43 0x4002b187 in QTest::qExec (testObject=0xbfe536e4, argc=5,
    QtQA::App::TestRunner:     argv=0xbfe537c4) at qtestcase.cpp:1956
    QtQA::App::TestRunner: #44 0x08070ffb in main (argc=5, argv=0xbfe537c4) at tst_qxmlquery.cpp:3475

      Also, an isolated testcase is forthcoming.

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            nierob Nierob
            rmcgover Rohan McGovern (Inactive)
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              Resolved:

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