[MU4 Issue] Crash on quit when using Kontakt Player on other VSTe (Mac only)

[DmitryArefiev]

To Reproduce

1. Open a score
2. Add Kontakt Player as VSTi
3. Quit with Cmd+Q

https://user-images.githubusercontent.com/90187801/160401863-175120b5-a51a-41c1-9f9b-622e161b9f16.mov

Platform information macOS 12.2, M1 laptop

Additional info

crash.txt

The issue also reproduces with plugins:

• Valhalla
• LABS

[DmitryArefiev]

@vpereverzev Still occurs in master..

crash 2.txt

[vpereverzev]

MuseScore stops working, asks plugins to release resources, and exits with no error codes. However, it seems like Kontakt is not prepared for the fact that work can stop before the loading of its resources is finished, which it's handling in the background thread. Need to discuss this directly with the Kontakt developers

It's better to keep this issue opened, tho

[Tantacrul]

Dmitri, is this still happening?

[DmitryArefiev]

@Tantacrul Yes, still occurs. And also the same think with Valhalla supermassive plugin

https://user-images.githubusercontent.com/90187801/191506300-65abe828-a966-4364-af20-c4e6479c33e0.mov

crashlog on quit_valhalla.zip

[DmitryArefiev]

@abariska Can you try on your side please?

[abariska]

Reproducible on my mac. On this score Crash_Kontakt_Valhalla.mscz.zip

[abariska]

The issue is reproducible with at least three plugins: NI Kontakt, Valhalla reverbs, LABS

[Tantacrul]

OK, thanks! I can reproduce with NI Kontakt. Haven't tried the others yet.

[Tantacrul]

We're having issues with Kontakt VST3, where closing it causes issues on Mac. Apparently, it's a known issue with Kontakt and we don't think its wise to try and attack it for Release. I've increased the severity and moved to 4.x.

[bkunda]

See also #15853, which may likely just be another case of the present issue.

[Tantacrul]

Seems to be a duplicate of #15853

[DmitryArefiev]

Fixed in #16306

[DmitryArefiev]

Retested on Mac12.6