piglit: 246791c51ec7f4e9c2ea3333793b372bcbb749c9 (master)
$ ./piglit run -b junit --no-concurrency --log-level dummy tests/quick.py results/quick
Warning: A python exception that should have been handled was not. This is bug and should be reported.
I cannot reproduce this with current master (4f9caf084eda7353af7bbe2d415b73a0e8d897eb). Do you happen to have a file at "tests/spec/glsl-1.10/execution/variable-indexing/vs-varying-mat4-col-rd.shader_test"?
I did a clean build of piglit and now no longer see the error.