Android lollilop : All Qt applications segfault at exit (press back button)

Application (a basic QML application for example) crashes when we press back button on Android lollilop 5.0 :

I/InputDispatcher( 873): Delivering key to (28281): action: 0x1 (0)
F/libc (28281): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 28393 (QtThread)
I/DEBUG ( 284): pid: 28281, tid: 28393, name: QtThread >>> org.qtproject.example <<<
I/ActivityManager( 873): Process org.qtproject.example (pid 28281)(adj 13) has died(83,428)
I/Zygote ( 318): Process 28281 exited due to signal (11)

A popup appears to notify user the application stopped.

I could reproduce it on a basic ARM API 21 AVD, but I ran also without this issue for some unknown reasons.