Unknown crash in TerrainTracksRenderObjClassSystem::flush possibly due to failed vertex buffer lock

[Caball009]

Crash link: https://www.youtube.com/live/D7hA7cFWQfs?t=3620

Playing the replay file hasn't reproduced the crash so far; not for Legi, either.

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The dump files indicates this crashed here because verts is a nullptr:

GeneralsGameCode/Core/GameEngineDevice/Source/W3DDevice/GameClient/W3DTerrainTracks.cpp

Line 858 in a7447e5

verts->x=endPoint->X;

The only way I can see that happening is if DX8VertexBufferClass::WriteLockClass fails to lock the vertex buffer:

GeneralsGameCode/Core/GameEngineDevice/Source/W3DDevice/GameClient/W3DTerrainTracks.cpp

Lines 826 to 827 in a7447e5

	DX8VertexBufferClass::WriteLockClass lockVtxBuffer(m_vertexBuffer);
	VertexFormatXYZDUV1 *verts = (VertexFormatXYZDUV1*)lockVtxBuffer.Get_Vertex_Array();

Callstack:

generalszh!TerrainTracksRenderObjClassSystem::flush+0x184
generalszh!HeightMapRenderObjClass::Render+0x7b7
generalszh!RTS3DScene::Customized_Render+0xf1
generalszh!RTS3DScene::Render+0x12f