This is an issue that I am experiencing for years. Sometimes I try to stop Qtractor, either via File>Exit or by closing the Qtractor main pane window, then it becomes unresponsive and I have to kill Qtractor, either via kill -9 or by a 2nd try to close the main pane window, then xfce4 asks me if this program should be stopped.
To investigate it further I compiled a Debug build from the most recent Qtractor. With the same qtr-file I had 2 different behaviors:
1st run: Qtractor freezed after issuing the last "Stopping disk thread...OK" line. I had to kill it.
2nd run: Qtractor was able to stop, but I got a lot of debug output about memory leaks
I am afraid it's a nasty race condition because it happens more often, the bigger the session (number of plugins) and the weaker the CPU is.
I attach the log.
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