High Crash Rate on iOS in PreloadManager

Unity Engine
,
1

0 myth find_position (functional:659)
1 myth find (densehashtable.h:270)
2 myth GetPreloadData (densehashtable.h:270)
3 myth CollectPreloadData (AssetBundleManager.cpp:184)
4 myth CollectPreloadDataRecursively (AssetBundleManager.cpp:215)
5 myth CollectPreloadDataDependencies (densehashtable.h:413)
6 myth CollectFullPreloadDataDependencies (AssetBundleLoadAssetOperation.cpp:133)
7 myth Perform (AssetBundleLoadAssetOperation.cpp:144)
8 myth ProcessSingleOperation (PreloadManager.cpp:302)
9 myth Run (PreloadManager.cpp:381)
10 myth Run (PreloadManager.cpp:205)
11 myth RunThreadWrapper (Thread.cpp:40)
12 libsystem_pthread.dylib __pthread_body + 240
13 libsystem_pthread.dylib __pthread_body

We’re using Unity 5.3.7p4, and seeing lots of crashes above on iOS devices through ‘Bugly’ (an online bug report platform). the crash rate can be up to 20%! All the crashes happen within 40 sec since start up. And this crash is never reported on Android devices. We haven’t allocate the reason currently, any thoughts of that?

2

Quite an old question, though.
It’s a bug that still exists in 2018 and after. It crashed because of the assetbundle had been destroyed in a race condition. As a workaround, I recommend you to avoid unloading the assetbundle on which has active async load asset operations. Unload it unless all async loading’s been done.