Hangs/crashes creating a 10x workspace in an Unreal Engine codebase

[jamiehayes]

Description:

When creating a 10x workspace in the root folder of a large codebase (e.g. Unreal Engine), the editor becomes very unresponsive and hangs and/or crashes while trying to use it.

Reproduction Steps:

I reproduce this issue by doing the following:

• Go to File -> Create Workspace...
• Create the workspace location in a folder where you have Unreal Engine source, with one or more Unreal Projects.
• Keep "Sync Folder" and "Recursive" checked
• Add .ush and .usf to the include filter list
• Click OK
• Wait for the Workspace Tree to be populated (Note that the initial generation of the workspace tree can take quite a long time)
• Once the workspace tree has been populated and the editor begins parsing, attempting to do almost anything with the editor seems to cause it to hang or become unresponsive for multiple seconds to minutes at a time.

Additional Notes:

• One specific operation that seems to cause crashes without fail while parsing: open any .cpp file that has a matching .h file and try to open the .h file with Alt+O.
• Only sometimes when it crashes does it present a crash dump.
• Sometimes even when I do get the crash dump dialog, it is also accompanied by another dialog that indicates that tar has crashed, and a 0byte crash dump is produced.
• I have uploaded one crash dump that was seemingly successfully saved via pCloud.
• When it does hang, memory usage of the editor seems to climb unbounded until the system runs out of resources.

Other operations that apparently hang the editor in this state:

• Opening a different solution
• Opening Active Workspace settings
• Right-clicking a folder in the workspace tree

[slynch8]

Thanks for the crash repro and repro steps. I will investigate.

But for Unreal projects I'd recommend generating the Visual Studio sln file and using that instead. The problem with trying to open the root folder is that it includes all the intermediate files for all configs so creates a massive workspace. Opening the sln should work fine.