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Fixed in 2022.2.X

Fixed in 2021.2.X, 2022.1.X



Found in




Issue ID




Crash on GC_push_all when updating custom mesh generation



Reproduction steps:
1. Open the user's attached project
2. Open "Assets/CurveDesigner/Scenes/EndlessRunnerExampleScene" Scene
3. Select GameObject "RootCurve" from the Hierarchy
4. In the "Curve3D" Script component change values of "Vertex Density" and "Ring Point Count"

Expected result: Editor doesn't crash after changing parameters
Actual result: After some time Editor throws a "Fatal error in GC: Unexpected mark stack overflow" error and crashes

Reproducible with: 2021.2.0a18, 2021.2.6f1, 2022.1.0b1
Not reproducible with: 2019.4.33f1, 2020.3.24f1, 2021.1.28f1, 2021.2.0a17

First lines of stacktrace:
x00007FF96240C496 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:1379] GC_push_all
0x00007FF96219709B (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\boehm-gc.c:787] mono_push_other_roots
0x00007FF962409B3A (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:457] GC_mark_some_inner
0x00007FF9624099EB (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:522] GC_mark_some
0x00007FF962412CAD (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:832] GC_stopped_mark
0x00007FF9623FDAEC (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:705] GC_collect_a_little_inner
0x00007FF9623FBE69 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:1563] GC_allocobj

- it may take a few minutes to reproduce the crash

  1. Resolution Note (fix version 2022.2):

    Fixed in: 2022.2.0a5

  2. Resolution Note (fix version 2022.1):

    Fixed in: 2022.1.0b14

  3. Resolution Note (fix version 2021.2):

    Fixed in: 2021.2.17f1

Comments (3)

  1. rt_jscott

    Feb 11, 2022 22:25

    Yes this is really a problem. I would love any information how how to avoid this problem!

  2. xAdamQ

    Jan 22, 2022 23:48

    This issue is a nightmare on all platforms, I hope a fix!

  3. dduttonnc

    Jan 06, 2022 03:53

    I have this same issue as well.

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