Backtrace for the segfault in tst_TabsModelTests:

#0  QV4::MemoryManager::allocData (this=0x6ce400, size=size@entry=48, 
unmanagedSize=unmanagedSize@entry=0)
    at memory/qv4mm.cpp:254
#1  0x00007ffff77cfb4d in QV4::MemoryManager::allocManaged<QV4::MemberData> 
(unmanagedSize=0, size=<optimized out>, 
    this=<optimized out>) at 
../../include/QtQml/5.6.0/QtQml/private/../../../../../src/qml/memory/qv4mm_p.h:102
#2  reallocateHelper (old=old@entry=0x0, n=3, e=0x6ce5e0, e=0x6ce5e0) at 
jsruntime/qv4memberdata.cpp:53
#3  0x00007ffff77cfbd1 in QV4::MemberData::allocate (e=e@entry=0x6ce5e0, 
n=<optimized out>)
    at jsruntime/qv4memberdata.cpp:64
#4  0x00007ffff782ad0a in QQmlVMEMetaObject::allocateProperties (this=0x785080) 
at qml/qqmlvmemetaobject.cpp:1126
#5  QQmlVMEMetaObject::propertiesAsMemberData (this=0x785080) at 
qml/qqmlvmemetaobject.cpp:325
#6  0x00007ffff782b37b in QQmlVMEMetaObject::readPropertyAsString 
(this=this@entry=0x785080, id=id@entry=1)
    at qml/qqmlvmemetaobject.cpp:457
#7  0x00007ffff782dc8a in QQmlVMEMetaObject::metaCall (this=0x785080, 
o=<optimized out>, c=QMetaObject::WriteProperty, 
    _id=<optimized out>, a=0x7fffffffd480) at qml/qqmlvmemetaobject.cpp:693
#8  0x00007ffff6e2f8b0 in QMetaProperty::write(QObject*, QVariant const&) const 
()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff6e5635f in QObject::setProperty(char const*, QVariant const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x0000000000431e1a in TabsModelTests::createTabWithTitle(QString const&) ()
#11 0x0000000000432eca in TabsModelTests::shouldInsertAtCorrectIndex() ()
#12 0x000000000042f9b0 in TabsModelTests::qt_static_metacall(QObject*, 
QMetaObject::Call, int, void**) ()
#13 0x00007ffff6e2c6e6 in QMetaMethod::invoke(QObject*, Qt::ConnectionType, 
QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, 
QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, 
QGenericArgument, QGenericArgument, QGenericArgument) const () from 
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007ffff6e32101 in QMetaObject::invokeMethod(QObject*, char const*, 
Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, 
QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, 
QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) () from 
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ffff7fc8716 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Test.so.5
#16 0x00007ffff7fc93a3 in QTest::qExec(QObject*, int, char**) () from 
/usr/lib/x86_64-linux-gnu/libQt5Test.so.5
#17 0x000000000042f81e in main ()

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https://bugs.launchpad.net/bugs/1565507

Title:
  webbrowser-app fails tests with Qt 5.6

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