DemoRunner Multithreading Demo crashes after 5-10 minutes

DemoRunner 7.0.3 - if you run the Multithreading Demo, just let the default initial screen of moving balls run for 5-10 minutes, DemoRunner crashes.

This was on MacOS Mojave 10.14.6. Crash log attached:

crashlog.txt (78.9 KB)

I then took the PIP of the Multithreading Demo and ran it on Xcode/Mojave. It didn’t crash as quickly, but a few hours later it hit a SIGABRT:

libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument

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Same issue here on macOS Ventura 13.5.2 (Mac mini M2 Pro), using JUCE 7.0.4 or 7.0.5.

I tried to update to 7.0.6, 7.0.7 or the latest develop (5e52056b9), but I have a different crash (assertion fail) happening right away when loading the MultithreadingDemo:

I use similar code in my plugin, which obviously reproduces the same behavior.
Is there an alternative to the MessageManagerLock that would work properly until this is fixed ?

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Just to keep you posted I looked into this yesterday. I believe I’ve got a solution but it probably won’t be merged until sometime next week,

Thanks for reporting.

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Oh that’s perfect!

We never release on a Friday anyway :smiley:

Have a good weekend!

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