IL2CPP: Anyone else seeing MetadataCache::Initialize crashes sometimes when the game starts?

Sometimes, at startup, we get a crash before the game even gets to the splash screen. It seems like something is going wrong with initialising the game. The call stack looks like this:

Code (CSharp):

1. at libil2cpp.il2cpp::vm::MetadataCache::Initialize()(vm:40)
2. at libil2cpp.il2cpp::vm::Runtime::Init(char const*, char const*)(vm:60)

Just wanted to put it out there and see if anyone else is getting a similar problem on Android? I googled it but all the threads I found were iOS issues from a while ago. Seems iOS was/is experiancing the same issue.

 

Not much else is available. I haven't been able to reliablely reproduce it myself but I *have* seen this one in action myself. It just gives an ANR error as soon as you tap the icon. It generally happens after reinstalling the app (say, after I've made a change that I want to test on the device) and it never seems to happen twice in a row. Sort of like whatever cache it was trying to load up gets wiped when it crashes and on the next run everything is fine because it reinitialised the cache from scratch? I don't know the backend so I am just speculating ofcourse.

My speculation has led me to believe that maybe these crashes are just from users who receive an update to our game and experience this crash once upon the first launch after that update has been installed. These crashes makes up anther 1/3 of our total reports.

 

Your guess is as good as mine. I'll tey and trigger the problem again tomorrow and see if I can figure out anything else from the crash logs. Maybe there are other errors being throw before the crash dump, so I'll check for things like access violations and anything else that might look a little funny. Will also try and figure out how to reliablely reproduce it. Here's hoping I can reproduce it in a simple project!

 

@JoshPeterson submitted a repo today, bug report number 767281

Seems someone from Unity has already seen it and successful reproduced it on your end.

 

@JoshPeterson I reproduced this bug with Unity 5.3.4f1 & 5.3.5f1..
doesn't these two revisions contain your solution?

 

Hi,

I got the similar problem. My situation is that i create an ios project including unity folder as a component. Additionally, i want to setup this component in another project. However it crashes

@JoshPeterson


.

 

I put the 'global-metadata.dat' in the right way. However, it crashes after point of '
vm::MetadataLoader::LoadMetadataFile'. Maybe the variable of
's_Il2CppMetadataRegistration' is null.

 

ok, thx

 

@Yao2ich
I got the similar problem with you,did you solve this problem?

 

I'm trying to achieve the same thing as @Yao2ich. I changed [NSBundle mainBundle] to [NSBundle bundleForClass:] to refer to the right bundle of framework. Tested it to confirm, and finally I experienced a crash as seen in the following screenshot.

 

Useful. Thanks

 

@josh

Josh, I think at the end my problem is the same as @Yao2ich . I checked global-metadata.dat file was there, and the code passes, and then stuck at similar place as him, but I cannot see the code only assembly code here .

Did this problem submitted as bug report already? I want to know its status. Right now I'm trying 5.4.1, but not sure it would solve the problem.

 

@haxpor
I also met the same problem,what's your solution?

 

Yao2ich had you figured out the problem?! I've exactly with same error.

 

Anyone with the same problem! Find "UnityAppController.mm" in "didFinishLaunchingWithOptions:" replace "
UnityInitApplicationNoGraphics([[[NSBundle mainBundle] bundlePath] UTF8String]);
by:
NSBundle * bundle = [NSBundlebundleForClass:[self class]];
UnityInitApplicationNoGraphics([[bundle bundlePath] UTF8String]);

 

Hey everybody! Can any kind soul give any hints on how to create a framework or pod of an exported unity project? When creating pod the mac runs always out of resources...memory and disk. Those 20k files on Native folder are not helping. This task is really important for distribution and maintainability. Thanks folks!

 

Tanks for the input Josh! What I meant was I bundled the unity ios exported project into a cocoa touch Framework having in mind distribution and maintainability. I then added the created Framework (roughly 120mb) to the native project but I keep hitting "Undefined symbols not found for architecture armv7 _UnityInitRuntime referenced from _main in main.o. Might have something to do with fact that the function is included in the following category

referenced in trampoline and implemented in unity player lib" as stated on UnityInterface.h.

With that function commented (yeah I know I wont go far) the whole project successfully builds although the engine launch crashes with the error mentioned in the first post.

Would like to hear more from you guys and If I can help in anything do ask!

Cheers

 

Thank for you assistance nevertheless Josh! Myself and co worker hit a wall with this both with pod creation and framework. MetadataLoader.cpp line 13...although the file is present (global-metadata.dat) and referenced on the project il2cpp cannot find it and thus generating the error. Josh can you point us to someone who can help us understand if what we are trying to accomplish is even possible or if the nature of how il2cpp works is binded to that rigid path of the dat file. On the exported project I moved the dat file and found the exact same error. It's like it can only see if its in Data/Managed/Metadata. God dammit! Is it protection on your side? Once again thank you very much

 

I also met the same problem。 i had put the global-metadata.dat in right way。@JoshPeterson ， would you help me？thanks。

 

@JoshPeterson
I also met the same problem。 i had put the global-metadata.dat in right way。But run crash still。 Then I found if change framework‘s Mach-O Type to Dynamic Library 。This problem will be solved！
But why？ one is static library dependency ，one is dynamic library, the other is source code dependency！

Unity 5.5.1f1 xcode 8.2.1

 

@JoshPeterson ，Thank you.

I need to search for a new solution。 Because my app must supports ios7 and later,but dynamic library only support ios8 and later.

Notice Me， If somebody solves this problem！

 

I met the same problem too, but if I import the Data to my iOS project by "creat folder references" and import the Classes&Libraries by " creat groups", the problem will be solved

 

I met the same problem, and I found that MetadataCache crashes because the MetadataCache::Register function (which is supposed to be called before MetadataCache is initalized), is actually never called.

This happens when you try to initialize the Unity runtime from outside the main binary: you can solve the problem by manually calling "s_Il2CppCodegenRegistration()" before "UnityInitApplicationNoGraphics(...)".

The problem is that, in my case, this only works if I try to init Unity from a static library: when I try from a dynamic one, I get a crash on "il2cpp::metadata::Il2CppGenericClassCompare".

Any help, please? @JoshPeterson

 

Yeah, it can be solved using your way!! Thank you. But I meet another crash.


@JoshPeterson @xiaoyi6409 do you have any idea?

 

help @JoshPeterson

 

Do you have a solution?

 

#0 il2cpp::vm::MetadataCache::Initialize()
#1 il2cpp::vm::Runtime::Init(char const*, char const*)
#2 ::InitializeIl2CppFromMain()
#3 ::UnityInitApplicationNoGraphics()
#4 ::-[UnityAppController application:didFinishLaunchingWithOptions:](UIApplication *, NSDictionary *)
#5 ::-[AppDelegate application:didFinishLaunchingWithOptions:](UIApplication *, NSDictionary *)
报：Thread 1:EXC_BAD_ACCESS(code=1,address=0×.......)

 

in iOS application

 

I guess it's about the Data folder path

 

Thank you all the same

 

The same is happening with me.

I'm trying to integrate a Unity scene with my iOS project and the crash happens all the time.

 

Hello guys! We have a special approach to build our Unity iOS project and we recently faced the same issue after updating it from Unity 5.6.2p2 to Unity 2017.1.0p2.

Based on what @UnknownRE suggested we checked that if we include -DRUNTIME_IL2CPP=1 in Other C Flags the following code would be enabled in Il2CppCodeRegistration.cpp file:

Code (CSharp):

1. #if RUNTIME_IL2CPP
2.  
3. static il2cpp::utils::RegisterRuntimeInitializeAndCleanup s_Il2CppCodegenRegistrationVariable (&s_Il2CppCodegenRegistration, NULL);
4.  
5. #endif

Everything is working fine after adding the flag.

 

@caiovm did you compile a static library that was imported into another project and it worked?

@UnknownRE how did you manually call "s_Il2CppCodegenRegistration()" method? Did you include a header file?

 

@caiovm Thanks, your solution worked. It appears that define is new. It wasn't in Unity 5.6.0. Kinda boneheaded to need the define at all, since iOS only supports the IL2CPP runtime.

 

Got his on UWP too, any idea on how to fix it pls ?

Cheers

 

@caiovm! You are a lifesaver! Worked like a charm!

 

I have the same issue when create static framework, but ok when create dynamic framework.