FActiveGameplayCueContainer::RemoveCue can crash while iterating removals

Development Programming & Scripting
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1

I’m experiencing a crash in FActiveGameplayCueContainer::RemoveCue. It is possibly the same root cause as [Content removed] - however, there is not a linked issue or one that I’m able to find by searching the issue tracker

Can you confirm that this is already being tracked and provide a ticket for me to follow? My repro steps are below in case that’s helpful.

EDIT: I found https://issues.unrealengine.com/issue/UE-221997, which is involved in the repro I laid out. Just preventing extraneous removals wouldn’t fix this case, however.

2

Steps to Reproduce

  1. Set up an effect with a duration and gameplay cue X
  2. Set up an effect that grants tag Y and gameplay cue Z
  3. Set up an effect with a duration, requires tag Z component, and gameplay cue X
  4. Apply all 3 effects to a target in the order I specified
  5. Remove all effects that grant tag Y. When cue Z sends the removal event, the effect that requires tag Z will remove its cue and also the cue granted by the first effect
  6. The removal of cue Z will now be out of range.

EDIT: This repro requires mixed (or possibly minimal) replication mode on the ability system component

3

Hi there,

Unfortunately I have been unable to reproduce the issue that you describe using the provided steps to reproduce. Are you able to please provide a minimal example project that reliably reproduces the issue and attach it to this case.

Kind Regards

4

Hi there,

Thank you for providing the project files. I have successfully verified the results that you have reported and have sent a bug report to Epic. You can track progress on the bug here when it becomes publicly available.

Many Thanks

5

Sure. The missing step is flip the ability system component to mixed replication mode. I’ve attached a repro built on the 3rd person sample project. Just hit play. The character begin play is where I hooked up the crash in BP.