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[Zsombor Egri <1539558@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~zsombi/ubuntu-ui-toolkit/xenial_crash

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https://bugs.launchpad.net/bugs/1539558

Title:
  segfault in tst_subtheming on xenial

Status in ubuntu-ui-toolkit package in Ubuntu:
  In Progress

Bug description:
  Program received signal SIGSEGV, Segmentation fault.  
  0x00007fdef2592280 in QV4::Value::operator= (v=<optimized out>, this=0x7fded67ff0) at jsruntime/qv4value_p.h:390
  390     jsruntime/qv4value_p.h: No such file or directory.
  (gdb) bt
  #0  0x00007fdef2592280 in QV4::Value::operator= (v=<optimized out>, this=0x7fded67ff0) at jsruntime/qv4value_p.h:390
  #1  QV4::ScopedProperty::ScopedProperty (scope=<synthetic pointer>, this=<synthetic pointer>) at jsruntime/qv4scopedvalue_p.h:436
  #2  QV4::Object::insertMember (attributes=..., v=..., s=0x2061440, this=0x7fded67ff0d0) at jsruntime/qv4object_p.h:202
  #3  QV4::Object::defineReadonlyProperty (this=0x7fded67ff0d0, name=0x2061440, value=...) at jsruntime/qv4object.cpp:184
  #4  0x00007fdef25a1fed in QV4::Heap::StringObject::StringObject (this=<optimized out>, engine=0x2061140, val=...)
      at jsruntime/qv4stringobject.cpp:91
  #5  0x00007fdef2548e25 in QV4::MemoryManager::alloc<QV4::StringObject, QV4::ExecutionEngine*, QV4::Value> (arg2=..., 
      arg1=0x2061140, this=<optimized out>) at jsruntime/qv4mm_p.h:126
  #6  QV4::ExecutionEngine::newStringObject (this=0x2061140, value=...) at jsruntime/qv4engine.cpp:557
  #7  0x00007fdef25e474e in QV4::Runtime::callProperty (engine=0x2061140, nameIndex=<optimized out>, callData=0x7fded67ff078)
      at jsruntime/qv4runtime.cpp:969
  #8  0x00007fdee891347b in ?? ()
  #9  0x00007fded67ff070 in ?? ()
  #10 0x00007fded67ff070 in ?? ()
  #11 0x000000000284d930 in ?? ()
  #12 0x00007fded67ff068 in ?? ()
  #13 0x0000000002061140 in ?? ()
  #14 0x00007fded67ff060 in ?? ()
  #15 0x00007fded67ff058 in ?? ()
  #16 0x00007fded67ff060 in ?? ()
  #17 0x0000000002061140 in ?? ()
  #18 0x00007fdef2584fba in QV4::SimpleScriptFunction::call (that=<optimized out>, callData=<optimized out>)
      at jsruntime/qv4functionobject.cpp:565
  #19 0x00007fdef266e07f in QV4::Object::call (d=0x7fded67ff008, this=<optimized out>)
      at ../../include/QtQml/5.5.1/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:305
  #20 QQmlJavaScriptExpression::evaluate (this=this@entry=0x229f5c0, context=<optimized out>, function=..., 
      callData=callData@entry=0x7fded67ff008, isUndefined=isUndefined@entry=0x7ffd919818ec) at qml/qqmljavascriptexpression.cpp:158
  #21 0x00007fdef266e5ad in QQmlJavaScriptExpression::evaluate (this=this@entry=0x229f5c0, context=<optimized out>, function=..., 
      isUndefined=isUndefined@entry=0x7ffd919818ec) at qml/qqmljavascriptexpression.cpp:116
  #22 0x00007fdef267510c in QQmlBinding::update (this=0x229f5a0, flags=...) at qml/qqmlbinding.cpp:194
  #23 0x00007fdef267e6f6 in QQmlAbstractBinding::setEnabled (f=..., e=true, this=0x229f5d8)
      at ../../include/QtQml/5.5.1/QtQml/private/../../../../../src/qml/qml/qqmlabstractbinding_p.h:110
  #24 QQmlObjectCreator::finalize (this=0x228dbd0, interrupt=...) at qml/qqmlobjectcreator.cpp:1194
  #25 0x00007fdef260911e in QQmlComponentPrivate::complete (enginePriv=0x27f2b40, state=0x26a2060) at qml/qqmlcomponent.cpp:928
  #26 0x00007fdef26091e7 in QQmlComponentPrivate::completeCreate (this=0x26a1fc0) at qml/qqmlcomponent.cpp:964
  #27 0x00007fdef31cc1e6 in UCStyledItemBasePrivate::loadStyleItem(bool) ()
     from /usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/libUbuntuComponents.so
  #28 0x00007fdef31f15d6 in UCAbstractButtonPrivate::completeComponentInitialization() ()
     from /usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/libUbuntuComponents.so
  #29 0x00007fdef267e7c2 in QQmlObjectCreator::finalize (this=0x272c540, interrupt=...) at qml/qqmlobjectcreator.cpp:1207
  #30 0x00007fdef260911e in QQmlComponentPrivate::complete (enginePriv=0x27f2b40, state=0x2058f00) at qml/qqmlcomponent.cpp:928
  #31 0x00007fdef26091e7 in QQmlComponentPrivate::completeCreate (this=0x2058e60) at qml/qqmlcomponent.cpp:964
  #32 0x00007fdef2609050 in QQmlComponent::create (this=0x26d7f20, context=0x1ff2490) at qml/qqmlcomponent.cpp:791
  #33 0x00007fdef2f66c3d in QQuickView::continueExecute (this=this@entry=0x1eceed0) at items/qquickview.cpp:476
  #34 0x00007fdef2f6737d in QQuickViewPrivate::execute (this=0x22a0990) at items/qquickview.cpp:124
  #35 0x00007fdef353c5d2 in UbuntuTestCase::UbuntuTestCase(QString const&, QQuickView::ResizeMode, bool, QWindow*) ()
     from /usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Test/libUbuntuTest.so
  #36 0x000000000040efca in ThemeTestCase::ThemeTestCase (parent=0x0, assertOnFailure=true, file=..., this=0x1eceed0)
      at tst_subtheming.cpp:36
  #37 tst_Subtheming::test_default_theme_cleared_with_engine_bug1527546 (this=<optimized out>) at tst_subtheming.cpp:146
  #38 0x00000000004086d5 in tst_Subtheming::qt_static_metacall (_o=0x7ffd91982eb0, _id=<optimized out>, _a=<optimized out>, 
      _c=<optimized out>) at .moc/tst_subtheming.moc:350
  #39 0x00007fdef21690aa in QMetaMethod::invoke (this=this@entry=0x7ffd919825c8, object=object@entry=0x7ffd91982eb0, 
      connectionType=Qt::DirectConnection, connectionType@entry=2442667600, returnValue=..., val0=..., val1=..., val2=..., val3=..., 
      val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:2212
  #40 0x00007fdef216e7fd in QMetaObject::invokeMethod (obj=0x7ffd91982eb0, 
      member=member@entry=0x1ecf040 "test_default_theme_cleared_with_engine_bug1527546", type=2442667600, 
      type@entry=Qt::DirectConnection, ret=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., 
      val8=..., val9=...) at kernel/qmetaobject.cpp:1479
  #41 0x00007fdef34f508c in QMetaObject::invokeMethod (val9=..., val8=..., val7=..., val6=..., val5=..., val4=..., val3=..., 
      val2=..., val1=..., val0=..., type=Qt::DirectConnection, member=0x1ecf040 "test_default_theme_cleared_with_engine_bug1527546", 
      obj=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs.h:409
  #42 QTest::qInvokeTestMethodDataEntry (slot=0x1ecf040 "test_default_theme_cleared_with_engine_bug1527546") at qtestcase.cpp:1953
  #43 QTest::qInvokeTestMethod (slotName=0x1ec9998 "test_default_theme_cleared_with_engine_bug1527546()", data=data@entry=0x0)
      at qtestcase.cpp:2082
  #44 0x00007fdef34f5bb8 in QTest::qInvokeTestMethods (testObject=0x7ffd91982eb0) at qtestcase.cpp:2390
  #45 QTest::qExec (testObject=testObject@entry=0x7ffd91982eb0, argc=<optimized out>, argv=argv@entry=0x7ffd91982fd8)
      at qtestcase.cpp:2652
  #46 0x000000000040744b in main (argc=1, argv=0x7ffd91982fd8) at tst_subtheming.cpp:887

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