If store vertex and index data in vertex buffer and the data's offset is not 0, the glDrawElements will draw nothing. If the data's offset in buffer is 0, glDrawElements work correctly.
Created attachment 11055 [details] test case
fix in mesa git ea07a0df9a2f689b8f5acaf92c40bbbd602cab3c. BTW, your test case is incorrect.
Mass version move, cvs -> git
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