Crashes on iOS (asset bundle related)

Hey,

We are experiencing many such crashes on our iOS version. These seem to be related to asset bundle loading (or unloading?) while the game is terminating (according to the stack, though i am not sure).

This release was made using Unity 5.3.5p4 (the last one was with 5.3.4p1 and did not have this specific crash type).

Is this a known issue? what can we do to resolve it ?

 

Hey @liortal,
We have seen this stack pop up. We have not been able to get a reproduction project back though. Do you have such a reproduction project? It would greatly help our investigation into this issue. If you file a bug with a reproduction case, please post the case number here.
Cheers,
Chris

 

Unfortunately I don't know the exact reproduction steps.

We have a crash reporting service that reports all the crashes in our game. This crash is the top one right now for the latest version. But i do not have any steps on how to reproduce the issue (we've never seen it internally during testing).

Here are some stats, this is what i can offer at the moment:

1. It occurred over 600 times already.
2. The build was created using Unity 5.3.5p4.
3. All devices ran iOS 9.3.2 (100%)
4. I was able to find this crash in the previous version of our game (built with 5.3.4p1):

Again, as i said, even if i shared our project with you, without exact reproduction steps, there's probably little you'll be able to do as this isn't reproduced internally.

Could you maybe help me better understand the scenario through the stack trace, having more insight into what it actually means? it appears that the application is terminating. Is this callback raised when the user is shutting down the game? will it also happen during a crash? (e.g: the game crashed anyway for another reason and is performing a cleanup)

Any information may help in finding the root cause for this issue

 

Hi @christophergoy ,
We are also experiencing similar issue, we are not sure when it occurs as its happening on live with with our users.

0x1010dff20 UnityWebStream::Release() (UnityWebStream.cpp:75)
0x1010dfe4c CleanupUnityWebStreams(void*) (LinkedList.h:26)
0x100de3ff8 RegisterRuntimeInitializeAndCleanup::ExecuteCleanup() (RegisterRuntimeInitializeAndCleanup.cpp:69)
0x100d37684 RuntimeCleanup() (Player.cpp:1073)
0x10010ce48 -[UnityAppController applicationWillTerminate:] (UnityAppController.mm:358)
0x185c31240 -[UIApplication _terminateWithStatus:] + 280
0x185e4fff8 __102-[UIApplication _handleApplicationDeactivationWithScene:shouldForceExit:transitionContext:completion:]_block_invoke2017 + 796
0x185e530c8 _runAfterCACommitDeferredBlocks + 292
0x185e60a80 _cleanUpAfterCAFlushAndRunDeferredBlocks + 92
0x185b925a4 _afterCACommitHandler + 96
0x1809f8728 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
0x1809f64cc __CFRunLoopDoObservers + 372
0x1809f68fc __CFRunLoopRun + 928
0x180920c50 CFRunLoopRunSpecific + 384
0x182208088 GSEventRunModal + 180
0x185c0a088 UIApplicationMain + 204
0x1000f84ac main (main.mm:32)
0x1804be8b8 (Missing)

we are using Unity 5.3.5p7 pro version

 

@tanveerm good to know that this still happens with patch 7. This means that the issue is not fixed yet.
I now wonder where it happens and whether they'll be able to fix it.

 

@liortal , did you manage to get it to work by doing work around?
@christophergoy , any updates on this? when will this be fixed?

 

What workaround? i am not ever sure where this happens (i never saw this issue in-house).

 

Hey guys, the stack that @tanveerm posted is being address currently. @liortal I have not been able to address your original stack trace yet, but it is next on my list of things to tackle. I'll keep you posted on this thread.
Cheers,
Chris

 

@christophergoy Hi, its been long time we are getting this crash. are there any updates on this?

 

Hi @tanveerm,
There was a fix submit a couple of weeks ago into 5.3.6p7. Are you still seeing this crash on that version or later?
Cheers,
Chris

 

Hi @christophergoy ,
We are still on 5.3.5p7, we will be moving to 5.4x very soon. Good to know that it has been fixed.
Thanks,
Tanveer.

 

Hi @liortal,we happen on 5.3.6p8 device containt:iphone5c and ipad air2,i have load assetbundle use loadfromfile , crash message:
BesideM FileSystemEntry::Set(char const*)+199
1BesideM FileSystemEntry::Set(char const*)+164
2BesideM FileSystemEntry::FileSystemEntry(char const*)+108
3BesideM ArchiveStorageReader::Initialize(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, unsigned long long)+124
4BesideM AssetBundleLoadFromAsyncOperation::InitializeAssetBundleStorage(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, unsigned long long)+140
5BesideM AssetBundleLoadFromFileAsyncOperation::LoadArchiveJob(void*)+26
6BesideM JobQueue::Exec(JobInfo*, int, int)+86
7BesideM JobQueue::Steal(JobGroup*, JobInfo*, int, int, bool)+214
8BesideM JobQueue::ExecuteJobFromQueue()+72
9BesideM JobQueue:rocessJobs(void*, bool*)+54
10BesideM JobQueue::WorkLoop(void*)+8
11BesideM Thread::RunThreadWrapper(void*)+46
12libsystem_pthread.dylib __pthread_body+141
13libsystem_pthread.dylib _pthread_start+102

 

well we're still getting this in 5.4.3f1.

 

Hey @tranveerm,
Can you file a bug report and attach a reproduction case? If you have already filed a bug please the case number here.
Cheers,
Chris

 

0 myth Release (UnityWebStream.cpp:75)
1 myth Release (UnityWebStream.cpp:75)
2 myth CleanupUnityWebStreams (LinkedList.h:26)
3 myth ExecuteCleanup (RegisterRuntimeInitializeAndCleanup.cpp:69)
4 myth RuntimeCleanup (Player.cpp:1069)
5 myth UnityPlayerLoopImpl (LibEntryPoint.mm:243)
6 myth UnityRepaint (UnityAppController+Rendering.mm:234)
7 myth -[UnityAppController(Rendering) repaintDisplayLink] (UnityAppController+Rendering.mm:49)
8 QuartzCore CA:isplay:isplayLinkItem::dispatch(unsigned long long) + 44
9 QuartzCore CA:isplay:isplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 436
10 IOKit IODispatchCalloutFromCFMessage + 372
11 CoreFoundation ___CFMachPortPerform + 180
12 CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 56
13 CoreFoundation ___CFRunLoopDoSource1 + 436
14 CoreFoundation ___CFRunLoopRun + 1752
15 CoreFoundation CFRunLoopRunSpecific + 424
16 GraphicsServices GSEventRunModal + 100
17 UIKit UIApplicationMain + 208
18 myth main (main.mm:32)
19 libdyld.dylib _start + 4

We're using 5.3.7p4, and this crash online has a really high occur rate.