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Build K-3D with CMAKE_BUILD_TYPE set to Debug.
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If you have a consistent way of crashing K-3D, start K-3D from the build dir using make run-gdb/fast
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At the gdb prompt, type run
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Do what is needed to provoke the crash
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Switch back to the terminal where you started K-3D, and type bt
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You should now get a trace, showing the files and lines of source code that led to the crash