Created attachment 94629 [details]
Bisect log (for reproducibility)

Running Unigine Tropics hangs the GPU on Ironlake.  This occurs with 10.1 and master, and is a regression: Mesa 10.0.3 works fine.

A bisect shows:

67ebcb4711d7c6d35df03298f065806613a62798 is the first bad commit
commit 67ebcb4711d7c6d35df03298f065806613a62798
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Mon Jan 13 14:32:56 2014 -0800

    i965: Use the new drm_intel_bo offset64 field.

    libdrm 2.4.52 introduces a new 'uint64_t offset64' field, intended to
    replace the old 'unsigned long offset' field.  To preserve ABI, libdrm
    continues to store the presumed offset in both locations.

    On Broadwell, a 64-bit kernel may place BOs at "high" (> 4G) addresses.
    However, with a 32-bit userspace, the 'unsigned long offset' field will
    only be 32-bit, which is not large enough to hold this value.  We need
    to use a proper uint64_t (like the kernel does).

    Technically, a lot of this code doesn't affect Broadwell, so we could
    leave it using the old field.  But it makes sense to just switch to the
    new, properly typed field.

    Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
    Reviewed-by: Eric Anholt <eric@anholt.net>
    Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

Steps to reproduce:
$ cd tropics
$ export MESA_EXTENSION_OVERRIDE=GL_EXT_framebuffer_multisample
$ ./1024x768_windowed.sh