https://bugs.freedesktop.org/show_bug.cgi?id=80673
--- Comment #7 from Hadrien freedesktop@psydk.org --- Created attachment 102330 --> https://bugs.freedesktop.org/attachment.cgi?id=102330&action=edit callstack of other similar problem when running with Mesa debug libs
This time 520 bytes were read but the buffer is 512 bytes only.