Calling QSerialPortInfo::availablePorts() leads to frequent crashes on OSX

I’m calling “QList<QSerialPortInfo> ports = QSerialPortInfo::availablePorts();” once every two seconds. After an intermittent amount of time, from a few seconds up to several minutes, my program crashes and Qt Creator’s debugger and Apple's crash log both point to this static method.

This is appears to be a regression. 5.3.1 did not have this problem.

Relevant crash log is here:

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Thread 7 Crashed:: SerialEnumerationThread
0 libobjc.A.dylib 0x00007fff8e670097 objc_msgSend + 23
1 QtCore 0x0000000100f10944 QCFString::toQString(__CFString const*) + 52
2 QtSerialPort 0x000000010c1a0e86 searchStringProperty(unsigned int, QCFString const&) + 102
3 QtSerialPort 0x000000010c19fe23 QSerialPortInfo::availablePorts() + 387
4 libSerial.dylib 0x000000010c833bab SerialConnection::availableDevices() + 123