Crash on MessageManager::deleteInstance()

#1

Hi,

There seems to be a problem when using multiple Juce (VST) plugins in the same host. I am getting occasional crashes when I close the last plugin. Here is the stack trace of the crash:

#0 0x90063f87 in objc_msgSend #1 0x01830ab0 in ?? #2 0x149d5c76 in juce::MessageManager::~MessageManager #3 0x149d5cfc in juce::MessageManager::deleteInstance #4 0x149d801f in juce::shutdownJuce_GUI #5 0x14b0186c in JuceVSTWrapper::~JuceVSTWrapper #6 0x14afdff0 in AudioEffect::dispatchEffectClass #7 0x0003c834 in juce::VSTPluginInstance::~VSTPluginInstance #8 0x000496b4 in juce::AudioProcessorGraph::Node::~Node #9 0x000432d8 in juce::GraphRenderingOps::ProcessBufferOp::~ProcessBufferOp #10 0x00035fce in juce::deleteRenderOpArray #11 0x0003f602 in juce::AudioProcessorGraph::buildRenderingSequence #12 0x0003d15c in non-virtual thunk to juce::AudioProcessorGraph::handleAsyncUpdate() #13 0x0009d5b3 in juce::AsyncUpdater::AsyncUpdaterMessage::messageCallback #14 0x0009e92f in juce::MessageQueue::deliverNextMessage #15 0x0009e9cc in juce::MessageQueue::runLoopCallback #16 0x9576342b in __CFRunLoopDoSources0 #17 0x95760eef in __CFRunLoopRun #18 0x957603c4 in CFRunLoopRunSpecific #19 0x957601f1 in CFRunLoopRunInMode #20 0x90bb3e04 in RunCurrentEventLoopInMode #21 0x90bb3af5 in ReceiveNextEventCommon #22 0x90bb3a3e in BlockUntilNextEventMatchingListInMode #23 0x98b23595 in _DPSNextEvent #24 0x98b22dd6 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] #25 0x98ae51f3 in -[NSApplication run] #26 0x0009b4bb in juce::MessageManager::runDispatchLoop #27 0x001297a3 in juce::JUCEApplication::main #28 0x001298e2 in juce::JUCEApplication::main #29 0x00006be5 in start

To reproduce the problem, it’s quite simple. You can create 6-7 different versions (change the JucePlugin_PluginCode constant for each) of the Juce Demo plugin. Then run the Juce Demo host, scan the folder in which they are, and then try inserting 2-3 of them, then deleting the first, then the others. If you try this a few times, you are sure to get a crash.

It looks as if either the MessageManager could not be deleted, or was already deleted through shutdownJuce_GUI by another plugin(?). I haven’t investigated any further at the moment.

I have made sure to use RELEASE versions of both the plugins and host.

Hope you can come up with some explanation or fix, because this is a big problem for us, with our app crashing randomly at closing time, when deallocating the plugins.

Thanks!

Mariano

#2

Which version of juce?

#3

Introjucer tells me I have v. 2.0.19

#4

Then I think you can guess what my answer is.

#5

Ok, let me try after updating to 2.0.25. Do you recall fixing anything related to that lately?

#6

No, but your version may pre-date the changes where I obfuscated the internal obj-C class names, preventing cross-module obj-C linkage.

#7

Ok, will try that, though I have the same problem on Windows.

#8

Great! Seems like it’s solved. I couldn’t make it crash with plugins generated under Juce 2.0.25.

I’m getting a similar problem on Windows, but it’s with plugins generated using the Maize sampler tool, so it’s probably the developer at fault, there. I tried with Juce Demo plugins and it doesn’t crash.

Sorry for wasting your time;-)

Mariano