FStreamableManager::AsyncLoadCallback crashes

windywang · December 26, 2016, 1:02pm

Exception thrown: read access violation.
this was 0xFFFFFFFF00000002.

anonymous_user_b666e59e · December 29, 2016, 10:18pm

Hi windywang,

Would you be able to provide more details about what you are doing when you see this crash occur? I made a new code project in 4.12 with Starter Content, then moved a bunch of the content around in the Editor and selected the option to fix up redirectors. The process completed successfully for me without a crash occurring.

windywang · January 4, 2017, 11:02am

I add some log, and it shows that the AsyncLoadCallback is called after the FStreamableManager object destroyed

windywang · January 4, 2017, 11:03am

the number in [] is the FStreamableManager object address

[2017.01.04-11.09.17:921][640]LogStreamableManager: [1686261617184]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.17:921][640]LogStreamableManager: [1686261616416]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.17:921][640]LogStreamableManager: [1686261616160]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.17:986][641]LogStreamableManager: [1686261617184]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.17:986][641]LogStreamableManager: [1686261616416]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.17:986][641]LogStreamableManager: [1686261616160]:FStreamableManager::IsAsyncLoadComplete

[2017.01.04-11.09.18:002][641]LogStreamableManager: [1686261617184]:FStreamableManager::Unload

[2017.01.04-11.09.18:002][641]LogStreamableManager: [1686261617184]:FStreamableManager::~FStreamableManager

[2017.01.04-11.09.18:003][641]LogStreamableManager: [1686261616416]:FStreamableManager::Unload

[2017.01.04-11.09.18:003][641]LogStreamableManager: [1686261616416]:FStreamableManager::~FStreamableManager

[2017.01.04-11.09.18:003][641]LogStreamableManager: [1686261616160]:FStreamableManager::Unload

[2017.01.04-11.09.18:003][641]LogStreamableManager: [1686261616160]:FStreamableManager::~FStreamableManager

[2017.01.04-11.09.18:152][644]LogStreamableManager: [1686261617184]:FStreamableManager::AsyncLoadCallback

anonymous_user_b666e59e · January 4, 2017, 3:58pm

That does seem to indicate that there is a problem with released memory trying to be accessed. What are you trying to do when this occurs? Are you moving or deleting assets?

windywang · January 5, 2017, 1:34am

Spawn some new blueprint actors, and call AsyncLoadAsset in its BeginPlay. it has nothing to do with Redirectors

anonymous_user_b666e59e · January 5, 2017, 10:29pm

Thank you for that clarification. How many Blueprint actors are you spawning, and how many assets is each one loading? I set up a project to spawn 100 Blueprint actors, with each one loading a static mesh asset and setting it into a Static Mesh Component. I ran the project several times in PIE, and did not experience a crash. In my case, they are all loading the same asset, so it may not be an adequate test. Does the crash occur for you every time?

windywang · January 6, 2017, 1:45am

more information:

they are not load the same resouce
destroy them before load completed
it crahes more in DebugEditor build, but not every time

anonymous_user_b666e59e · January 6, 2017, 9:33pm

Hi windywang,

Thank you for the additional information. I believe I was able to reproduce the crash that you described (my callstack is slightly different from the one that you showed), and have entered UE-40318 to have this investigated further.