Created attachment 121675 [details]
gdb bt

R9285 since mesa commit below Unreal ElementalDemo quits at start with a
segfault.

gdb from demo generated core attached

commit 7aedbbacae6d3ec3d06735fff2eb662964773ad2
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Sat Feb 6 22:09:45 2016 +0100

    radeonsi: put image, fmask, and sampler descriptors into one array

    The texture slot is expanded to 16 dwords containing 2 descriptors.
    Those can be:
    - Image and fmask, or
    - Image and sampler state

    By carefully choosing the locations, we can put all three into one slot,
    with the fmask and sampler state being mutually exclusive.

    This improves shaders in 2 ways:
    - 2 user SGPRs are unused, shaders can use them as temporary registers now
    - each pair of descriptors is always on the same cache line

    v2: cosmetic changes: add back v8i32, don't load a sampler state & fmask
        at the same time