Created attachment 88177 [details]
Full GDB backtrace of crash/buffer overflow

While running Piglit on radeonsi (full graphics stack detailed below) I
encountered an crash in
"spec/EXT_framebuffer_multisample/sample-alpha-to-coverage 4 depth". See the
attached GDB backtrace and register dump for more details.

Stack:
GPU: "PITCAIRN" (ChipID = 0x6819)
Linux: 3.11.6
libdrm: 2.4.47
LLVM: SVN:trunk/r193475
libclc: Git:master/4c18120c1a
Mesa: Git:master/64c081e8b7
GLAMOR: Git:master/ba209eeef2
DDX: Git:master/f1dc677e79

Let me know if you need further information.