System Environment:
--------------------------
Arch:           i386
Platform:       huronriver
Libdrm:         (master)2.4.29-3-gef20301a11afae50bfe127002913dbd0b81ddccc
Mesa:           (master)11cdf24d15763131a7ab4b366cad78116884d045
Xserver:                (master)xorg-server-1.11.99.901
Xf86_video_intel:(master)2.17.0-245-g58cee9d0def82d19f03c840325b6e84c20e77ace
Kernel:  (drm-intel-next)097354eb14fa94d31a09c64d640643f58e4a5a9a

Bug detailed description:
------------------------- 
It segfaulted on HuronRiver and Calpella. 
Bisect shows 07ee9f374f2946f852896e9264c7fa83eafc3f16 is the first bad commit.
commit 07ee9f374f2946f852896e9264c7fa83eafc3f16
Author:     Kenneth Graunke <kenneth@whitecape.org>
AuthorDate: Fri Dec 23 20:24:46 2011 -0800
Commit:     Kenneth Graunke <kenneth@whitecape.org>
CommitDate: Tue Dec 27 14:33:38 2011 -0800

    i965/vs: Properly clear cur_value when propagating direct copies.

    Consider the following code:

    MOV A.x, B.x
    MOV B.x, C.x

    After the first line, cur_value[A][0] == B, indicating that A.x's
    current value came from register B.

    When processing the second line, we update cur_value[B][0] to C.
    However, for drect copies, we fail to reset cur_value[A][0] to NULL.
    This is necessary because the value of A is no longer the value of B.

    Fixes Counter-Strike: Source in Wine (where the menu rendered completely
    black in DX9 mode), completely white textures in Civilization V, and the
    new Piglit test glsl-vs-copy-propagation-1.shader_test.

(gdb) bt
#0  0xb7b13ff4 in brw::vec4_visitor::opt_copy_propagation (this=0xbffd26e4) at brw_vec4_copy_propagation.cpp:309
#1  0xb7b13cca in brw::vec4_visitor::run (this=0xbffd26e4) at brw_vec4_emit.cpp:772
#2  0xb7b13dce in brw::brw_vs_emit (prog=0x84aec28, c=0xbffdaf08) at brw_vec4_emit.cpp:1010
#3  0xb7acbf26 in do_vs_prog (brw=0x8413408, prog=0x84aec28, vp=0x84faf58, key=0xbfffec7c) at brw_vs.c:232
#4  0xb7acc2e4 in brw_upload_vs_prog (brw=0x8413408) at brw_vs.c:338
#5  0xb7acb077 in brw_upload_state (brw=0x8413408) at brw_state_upload.c:503
#6  0xb7ab7917 in brw_try_draw_prims (ctx=0x8413408, arrays=0x8478af8, prim=0xbfffee58, nr_prims=1, ib=0x0, index_bounds_valid=1 '\001', min_index=0, max_index=3,
    tfb_vertcount=0x0) at brw_draw.c:521
#7  brw_draw_prims (ctx=0x8413408, arrays=0x8478af8, prim=0xbfffee58, nr_prims=1, ib=0x0, index_bounds_valid=1 '\001', min_index=0, max_index=3, tfb_vertcount=0x0)
    at brw_draw.c:605
#8  0xb7bda1aa in vbo_draw_arrays (ctx=0x8413408, mode=5, start=0, count=4, numInstances=1) at vbo/vbo_exec_array.c:600
#9  0xb7bc6286 in _es_DrawArrays (mode=5, first=0, count=4) at main/api_exec_es2.c:688
#10 0x0839ed0b in GTFGL2TestFixedDataTypeApply (pTestTransformViewport=0x8412788) at ./Source/GL2Tests/GTFGL2TestFixedDataType.c:200
#11 0x0816ebca in GTFTestGL2TestApply (pTestGL2Test=0x84afd78) at ./Source/GTFTestGL2Test.c:311
#12 0x08057202 in GTFTestEncapsulateApply (pTestEncapsulate=0x84a6db8) at ./Source/GTFTest.c:233
#13 0x0809a7fa in GTFRunTest (run_filename=0x8400398 "/GFX/Test/Ogles2conform/ogles2conform/GTF_ES/glsl/GTF/GL2Tests/fixed_data_type/fixed_data_type.test")
    at ./Source/GTFTestDriver.c:307
#14 0x0809b531 in GTFRunTestDriver (run_filename=0x8400398 "/GFX/Test/Ogles2conform/ogles2conform/GTF_ES/glsl/GTF/GL2Tests/fixed_data_type/fixed_data_type.test")
    at ./Source/GTFTestDriver.c:580
#15 0x0807865d in GTFRun () at ./Source/GTFMain.c:101
#16 0x0811f177 in GTFInitEGL (run=0x8078603 <GTFRun>, argc=4, argv=0xbffff3e4) at ./Source/GTFInitEGL.c:236
#17 0x0807920c in GTFMain (argc=4, argv=0xbffff3e4) at ./Source/GTFMain.c:265
#18 0x0808d8ac in main (argc=4, argv=0xbffff3e4) at ./Source/main.c:202

Reproduce steps:
----------------
1. start X
2. ./GTF -width=64 -height=64 -run=GTF/GL2Tests/fixed_data_type/fixed_data_type.test