Encountered a crash during the garbage collection phase when using sequencer conditions with subsequence tracks. Specifically, objects appear to break the "Disregard for GC" assumptions.
Open the project from licensee, from UDN link, and run a cooked build.
Steps to Reproduce
1. Run cooked build of test project.
2. Type 1 to run sequencer
3. Crash
Project contains level sequence with 2 subsequences that moves a box. There is a conditional on first track.
[2025.03.31-09.37.39:084][432]LogWindows: Error: === Critical error: ===
[2025.03.31-09.37.39:084][432]LogWindows: Error:
[2025.03.31-09.37.39:084][432]LogWindows: Error: Fatal error: [Link Removed] [Line: 155]
[2025.03.31-09.37.39:084][432]LogWindows: Error: Encountered 2 object(s) breaking Disregard for GC assumptions. Please check log for details.
[2025.03.31-09.37.39:084][432]LogWindows: Error:
[2025.03.31-09.37.39:084][432]LogWindows: Error:
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff6432356d3 ConditionsTest.exe!VerifyGCAssumptions() [D:\UnrealEngine-release\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollectionVerification.cpp:156]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff6430d2a78 ConditionsTest.exe!UE::GC::PreCollectGarbageImpl<1>() [D:\UnrealEngine-release\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:5441]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64314f5e5 ConditionsTest.exe!UE::GC::FReachabilityAnalysisState::PerformReachabilityAnalysisAndConditionallyPurgeGarbage() [D:\UnrealEngine-release\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:5641]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff6431b1e00 ConditionsTest.exe!TryCollectGarbage() [D:\UnrealEngine-release\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:6023]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff649c2cbd4 ConditionsTest.exe!UEngine::ConditionalCollectGarbage() [D:\UnrealEngine-release\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:1902]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff6491e4810 ConditionsTest.exe!UWorld::Tick() [D:\UnrealEngine-release\Engine\Source\Runtime\Engine\Private\LevelTick.cpp:1704]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff648f040cf ConditionsTest.exe!UGameEngine::Tick() [D:\UnrealEngine-release\Engine\Source\Runtime\Engine\Private\GameEngine.cpp:1784]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64a113f75 ConditionsTest.exe!FEngineLoop::Tick() [D:\UnrealEngine-release\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5877]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64a124a1c ConditionsTest.exe!GuardedMain() [D:\UnrealEngine-release\Engine\Source\Runtime\Launch\Private\Launch.cpp:188]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64a124aea ConditionsTest.exe!GuardedMainWrapper() [D:\UnrealEngine-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:123]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64a1277e2 ConditionsTest.exe!LaunchWindowsStartup() [D:\UnrealEngine-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:277]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64a134714 ConditionsTest.exe!WinMain() [D:\UnrealEngine-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:318]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff64e9f937a ConditionsTest.exe!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2025.03.31-09.37.39:085][432]LogWindows: Error: [Callstack] 0x00007ff8e7667344 KERNEL32.DLL!UnknownFunction []
[2025.03.31-09.37.39:085][432]LogWindows: Error:
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-265587 in the post.
1 |
Component | UE - Anim - Sequencer |
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Affects Versions | 5.5 |
Target Fix | 5.6 |
Created | Apr 3, 2025 |
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Updated | Apr 15, 2025 |