QtSerialPort crashes with Qt 4 when loading udev dynamically

(gdb) thread apply all backtrace

Thread 1 (Thread 0x7ffff7fb9740 (LWP 14300)):
#0 0x00007ffff7ddc118 in udev_list_entry_get_name () from /usr/lib/libQtSerialPort.so.1
#1 0x00007ffff392d4c0 in ?? () from /usr/lib/libudev.so.1
#2 0x00007ffff392dc89 in ?? () from /usr/lib/libudev.so.1
#3 0x00007ffff392e4f0 in udev_enumerate_scan_devices () from /usr/lib/libudev.so.1
#4 0x00007ffff7bcf04c in availablePortsByUdev () at qserialportinfo_unix.cpp:218
#5 0x00007ffff7bcf9a1 in QSerialPortInfo::availablePorts () at qserialportinfo_unix.cpp:301
#6 0x0000000000402191 in main (argc=1, argv=0x7fffffffe798) at main.cpp:52
(gdb)

What is strange is that it does not crash at the first symbol resolution: https://qt.gitorious.org/qt/qtserialport/source/336fbee2e34c7eaf48550105d542cad1979c6684:src/serialport/qserialportinfo_unix.cpp#L218

Since the code may be modified in the future, I include the offending line in here for the report to be self-contained:

if (enumerate) {
    ::udev_enumerate_add_match_subsystem(enumerate, "tty");
    ::udev_enumerate_scan_devices(enumerate); // <--- CRASH HERE
    struct ::udev_list_entry *devices =
        ::udev_enumerate_get_list_entry(enumerate);

Here can you find the udev symbol resolution code: https://qt.gitorious.org/qt/qtserialport/source/336fbee2e34c7eaf48550105d542cad1979c6684:src/serialport/qtudev_p.h

The only difference between Qt 4 and 6 is the void* vs. void( * )() (QFunctionPointer)