Help with: Buffer_Not_Writeable_By_vImage

Dan Korneff

@Christoph-Hart Here's the crash log that contains the random crashes I've been experiencing:

BUG IN CLIENT OF LIBPLATFORM: Unlock of an os_unfair_lock not owned by current thread

Crashed Thread:        0  Main Thread  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:       0x0000000000000001, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Illegal instruction: 4
Termination Reason:    Namespace SIGNAL, Code 0x4
Terminating Process:   exc handler [1990]

Application Specific Information:
dyld: in dladdr()
BUG IN CLIENT OF LIBPLATFORM: Unlock of an os_unfair_lock not owned by current thread

Thread 0 Crashed:: Main Thread  Dispatch queue: com.apple.main-thread
0   libsystem_platform.dylib      	0x00007fff728fb655 _os_unfair_lock_unowned_abort + 23
1   libsystem_platform.dylib      	0x00007fff728f6aaf _os_unfair_lock_unlock_slow + 105
2   libsystem_pthread.dylib       	0x00007fff728fff53 _pthread_cond_check_init_slow + 206
3   libsystem_pthread.dylib       	0x00007fff728ffc98 pthread_cond_broadcast + 55
4   libc++.1.dylib                	0x00007fff6f9d6575 std::__1::condition_variable::notify_all() + 9
5   com.korneffaudio.myplug       	0x0000000141263052 juce::MessageManager::Lock::BlockingMessage::messageCallback() + 98
6   com.korneffaudio.myplug       	0x0000000141261146 juce::MessageQueue::deliverNextMessage() + 246
7   com.korneffaudio.myplug       	0x0000000141260ffe juce::MessageQueue::runLoopSourceCallback(void*) + 14
8   com.apple.CoreFoundation      	0x00007fff38592884 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
9   com.apple.CoreFoundation      	0x00007fff38592823 __CFRunLoopDoSource0 + 103
10  com.apple.CoreFoundation      	0x00007fff3859263d __CFRunLoopDoSources0 + 209
11  com.apple.CoreFoundation      	0x00007fff38591359 __CFRunLoopRun + 937
12  com.apple.CoreFoundation      	0x00007fff38590953 CFRunLoopRunSpecific + 466
13  com.apple.HIToolbox           	0x00007fff371ababd RunCurrentEventLoopInMode + 292
14  com.apple.HIToolbox           	0x00007fff371ab7d5 ReceiveNextEventCommon + 584
15  com.apple.HIToolbox           	0x00007fff371ab579 _BlockUntilNextEventMatchingListInModeWithFilter + 64
16  com.apple.AppKit              	0x00007fff357f1039 _DPSNextEvent + 883
17  com.apple.AppKit              	0x00007fff357ef880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
18  com.apple.AppKit              	0x00007fff357e158e -[NSApplication run] + 658
19  com.digidesign.framework.DFW  	0x0000000102b27ba7 DFW_EventLoop::RunApplicationEventLoop() + 27
20  com.digidesign.framework.DFW  	0x000000010292b87a TApplication::Run() + 34
21  com.digidesign.framework.ProTools_Orange	0x000000011e6b5836 Launch_Pro_Tools(char*, bool) + 1613
22  com.digidesign.framework.ProTools_Orange	0x000000011e6bc651 LaunchProTools + 5688
23  com.avid.ProToolsDeveloper    	0x0000000101997738 main + 5544
24  libdyld.dylib                 	0x00007fff726fbcc9 start + 1

Found this:
https://forum.juce.com/t/race-condition-i-e-crash-in-messagemanager-lock-with-fix/55870/4

And the fix:
https://github.com/juce-framework/JUCE/commit/33e81616ade84f40ccfec662c167b1b8dc772640

What do you suggest?

Dan Korneff

@Christoph-Hart should I try to cherry pick this JUCE commit? I'm not sure how different the message system is between 6 and 7....

Christoph Hart

@Dan-Korneff nice find! Yes, please try to cherry pick this, if it works, it would be awesome.

Dan Korneff

@Christoph-Hart I tried..

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(295,22): error C2065: 'lock': undeclared identifier (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(300,1): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(300,26): error C2146: syntax error: missing ';' before identifier 'scope' (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(300,26): error C2065: 'scope': undeclared identifier (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(393,22): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(393,22): error C2146: syntax error: missing ';' before identifier 'scope' (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(393,22): error C2065: 'scope': undeclared identifier (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(409,22): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int (compiling source file ..\..\JuceLibraryCode\i
nclude_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(409,22): error C2146: syntax error: missing ';' before identifier 'scope' (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

HISE\JUCE\modules\juce_events\messages\juce_MessageManager.cpp(409,22): error C2065: 'scope': undeclared identifier (compiling source file ..\..\JuceLibraryCode\include_juce_events.cpp) [Z:\Korneff Audio\Test Export\VST\Test Export\Binaries\Builds\VisualStudio2022\Test Export_SharedCode.vcxproj]

Looks a bit more involved.

Christoph Hart

@Dan-Korneff alright, I‘ll take a look.

Dan Korneff

@Christoph-Hart greatly appreciated !

Christoph Hart

@Dan-Korneff OK, I've manually patched the files (and I needed to pull in another class from JUCE 7 to compile), however now I'm hitting a few weird assertions that I didn't before so I'm a bit uncomfortable pushing this "fix" - it might be possible that there are other changes to JUCE 7's message handling and this would be a Frankenstein thing.

Christoph Hart

@Christoph-Hart Following the JUCE discussion, this might be a "better" fix (in the sense that it's less intrusive than the JUCE 7 fix):

https://forum.juce.com/t/blockingmessage-accessing-messagemanager-lock-that-went-out-of-scope/51901

Dan Korneff

@Christoph-Hart I can give this a try:

        if (blockingMessage != nullptr)
         {
          {
         ScopedLock lock(blockingMessage->ownerCriticalSection);
             blockingMessage->owner.set(nullptr);
          }
             blockingMessage->releaseEvent.signal();
             blockingMessage = nullptr;
         }

Dan Korneff

@Christoph-Hart Do you have any plans to eventually bump to JUCE 7?

Dan Korneff

@Christoph-Hart Does this look right? It's throwing a bunch of errors.

void MessageManager::Lock::exit() const noexcept
{
    if (blockingMessage != nullptr)
    {
        {
            ScopedLock lock(blockingMessage->ownerCriticalSection);
            blockingMessage->owner.set(nullptr);
        }
        blockingMessage->releaseEvent.signal();
        blockingMessage = nullptr;
    }

    const ScopeGuard scope{ [&] { blockingMessage = nullptr; } };

    blockingMessage->stopWaiting();

    if (!blockingMessage->wasAcquired())
        return;

    if (auto* mm = MessageManager::instance)
    {
        jassert(mm->currentThreadHasLockedMessageManager());
        mm->threadWithLock = {};
    }
}

EDIT: operator error. This works:

void MessageManager::Lock::exit() const noexcept
{
    if (lockGained.compareAndSetBool (false, true))
    {
        auto* mm = MessageManager::instance;

        jassert (mm == nullptr || mm->currentThreadHasLockedMessageManager());
        lockGained.set (0);

        if (mm != nullptr)
            mm->threadWithLock = {};

        if (blockingMessage != nullptr)
        {
            {
                ScopedLock lock(blockingMessage->ownerCriticalSection);
                blockingMessage->owner.set(nullptr);
            }
            blockingMessage->releaseEvent.signal();
            blockingMessage = nullptr;
        }
    }
}

Testing now

Help with: Buffer_Not_Writeable_By_vImage

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