[CRITICAL] Defer does not execute after cancellation through race

General Issues and Bug Reporting
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1

Summary

Here’s the repro

using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }

test_device := class(creative_device):

    StartFail()<suspends>:void=
        Print("StartFail")
        defer:
            Print("StartFail Ended (from suspending scope)") # Never prints
        
        race:
            Sleep(Inf)
            Sleep(Inf)

        Sleep(Inf)

    StartSucceed()<suspends>:void=
        Print("StartSucceed")
        defer:
            Print("StartSucceed Ended (from suspending scope)") # Prints correctly
        
        # race:
        #     Sleep(Inf)
        #     Sleep(Inf)

        Sleep(Inf)

    OnBegin<override>()<suspends>:void=
        race:
            Sleep(1.0)
            StartFail()
            StartSucceed() # Not required to repro

Prints

[2024.10.20-13.59.20:863][673]LogVerse: : StartFail
[2024.10.20-13.59.20:864][673]LogVerse: : StartSucceed
[2024.10.20-13.59.21:854][790]LogVerse: : StartSucceed Ended (from suspending scope)

(As you can see the StartFail defer never fires, this is an issue when trying to build complex async structures)

Please select what you are reporting on:

Verse

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

See summary

Expected Result

See summary

Observed Result

See summary

Platform(s)

PC

Race is finished but one can still trigger event inside of it
3

Can confirm it.

1 Like
4

I’d love to see this fixed!

3 Likes
5

It’s not fixed yet. I got the same issue. This is critical when using composed pattern with concurrency.

1 Like
6

FORT-807923 has been ‘Backlogged’. This is an issue that is in a queue to be addressed.