Running the cipherunittest test freezes. STEPS TO REPRODUCE 1. compile qca library in QtCreator 2. run cipherunittest OBSERVED RESULT cipherunittest freezes EXPECTED RESULT cipherunittest should pass SOFTWARE/OS VERSIONS Windows: 10 Qt Version: 5.15.0 msvc64_2019 ADDITIONAL INFORMATION Psi-im has the same behavior when it receives a list of certificates. The library was built in the environment of MSVC2019 x64 with official Qt libraries version 5.15.0 in the Windows operating system. The same behavior is observed when running a test built using mingw32 cross-compilation (MXE). When I'm pressing a pause button on program hangs the QtCreator shows this line https://github.com/KDE/qca/blob/ae5dec259faf60bec8cf1559d20876e6a5960f7a/src/support/syncthread.cpp#L183 and ok value is -52.