Observed this issue on two customer systems so far.
We have a simple Win32 OpenGL application, which crashed due to unrelated reasons close to shader compilation via OpenGL API.
On both customer systems, we faced afterwards a driver internal corruption when attempting to link the shader again. Output from `glGetProgramInfoLog`:
Fragment shader(s) failed to link.
Fragment link error: HW_UNSUPPORTED.
ERROR: Internal compile error, error code: E_SC_LITERAL_NOT_DEFINED
Shader not supported by HWWARNING: warning(#276) Symbol "color" usage doesn't match between two stages
In both cases a recovery was only possible by re-installing the driver package, thereby removing the cache. In both cases, the same shader could be linked without warnings afterwards.
