Restoring AU state crashes on Logic Pro 10.6.1 on M1. I have created a minimal program to reproduce here: juce_bugs/AUCrash at master · FigBug/juce_bugs · GitHub
It’s pretty simple, it creates a 2 KB MemoryBlock:
void AUCrashAudioProcessor::getStateInformation (juce::MemoryBlock& destData)
{
destData.setSize (2200);
destData.fillWith (0);
}
Then in restore state it is really slow checking the data is still all zeros
void AUCrashAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
criticalSection.enter();
juce::Thread::sleep (1000);
uint8_t* p = (uint8_t*)data;
for (int i = 0; i < sizeInBytes; i++)
if (p[i] != 0)
ohShit = true;
criticalSection.exit();
}
If you open a Project with a bunch of instances of the plugin, Logic will crash.
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x000000019fda2178 objc_msgSend + 24
1 com.apple.CoreFoundation 0x000000019ff9c670 CFDictionaryGetValueIfPresent + 64
2 com.Me.AUCrash 0x000000010b9de448 JuceAU::RestoreState(void const*) + 220 (juce_AU_Wrapper.mm:740)
3 com.Me.AUCrash 0x000000010ba01210 AUBase::DispatchSetProperty(unsigned int, unsigned int, unsigned int, void const*, unsigned int) + 2456 (AUBase.cpp:914)
4 com.Me.AUCrash 0x000000010b9d8080 AUMethodSetProperty(void*, unsigned int, unsigned int, unsigned int, void const*, unsigned int) + 124 (AUPlugInDispatch.cpp:167)
5 com.apple.audio.AudioToolboxCore 0x00000001a144b8c8 std::__1::__function::__func<setStateAndNotify(__CFDictionary const*, AUAudioUnitV2Bridge*, unsigned int)::$_7, std::__1::allocator<setStateAndNotify(__CFDictionary const*, AUAudioUnitV2Bridge*, unsigned int)::$_7>, void ()>::operator()() + 60
6 com.apple.audio.AudioToolboxCore 0x00000001a144b718 void applesauce::dispatch::v1::async<dispatch_to_main_queue_with_timeout(std::__1::function<void ()>)::$_4>(NSObject<OS_dispatch_queue>*, dispatch_to_main_queue_with_timeout(std::__1::function<void ()>)::$_4&&)::'lambda'(void*)::__invoke(void*) + 112
7 libdispatch.dylib 0x000000019fd5c420 _dispatch_client_callout + 20
8 libdispatch.dylib 0x000000019fd69e1c _dispatch_main_queue_callback_4CF + 836
9 com.apple.CoreFoundation 0x00000001a00439ec __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
I have worked around the crash by using CFRetain/CFRelease on the data block passed intoJuceAU::RestoreState. However I think this just makes the race condition a lot less likely, and is not actually a fix. reFX: retain preset data while loading preset · reFX/JUCE@51ce1fc · GitHub
I’m pretty sure this is actually a bug in the new AUHostingService that isn’t retaining the memory block passed in correctly, since I can’t see anything in the JUCE code that is draining the NSAutoreleasePool.
The Logic project to reproduce is in the repo. I have not been able to reproduce this on an Intel mac.
Does anybody know the best way to report bugs to Apple?
