Segfault when unloading a plugin which creates a QScriptEngine

When a plugin which creates a QScriptEngine is unloaded a segfault occurs. I modified an existing Qt unit test to demonstrate.

kde-devel@bishop:~/kde/src/qt/tests/auto/qpluginloader

{4.7}$ ./tst_qpluginloader pluginWithScriptEngine
********* Start testing of tst_QPluginLoader *********
Config: Using QTest library 4.7.0, Qt 4.7.0
PASS : tst_QPluginLoader::initTestCase()
PASS : tst_QPluginLoader::pluginWithScriptEngine()
PASS : tst_QPluginLoader::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped
********* Finished testing of tst_QPluginLoader *********
Segmentation fault
kde-devel@bishop:~/kde/src/qt/tests/auto/qpluginloader{4.7}

$

This does not occur with Qt 4.5.2 or Qt 4.6.2 on linux.