Created attachment 70401 [details]
xorg.0.log

System Environment:
--------------------------
Arch:        x86_64     
Platform:    Ironlake
Libdrm:	(master)libdrm-2.4.40-1-g7d42b49c0cf19dbb4531cd84efae51f95db2eea1
Mesa:	(master)d82b873a501606d62b9f208b6d5cda79c9a6b4b8
Xserver:(master)xorg-server-1.13.0-143-g6a6c3afe71ac82a93d9fd0034dd5bbdcf0eae1ea
Xf86_video_intel:(master)2.20.13-22-g03fb9ded43f9bf8b73f99d5b3a8dc592fe22b523
Cairo:	(master)62b795fe52c73ad58101c101aa77449f4b61a576
Libva:	(staging)38c94cd922473095814ed9a9f99ad98fcc9c285d
Libva_intel_driver:(staging)c0ef9d99df37ae45589fecb898727be495e50304
Kernel:	(drm-intel-nightly) 9423fabffc1c5298aec5100b34eec90fb8c70e2a

Bug detailed description:
------------------------- 
It fails on ivybridge,sandybridge,ironlake and pineview.
case repeat and triangles also fail and have same bisect commit.

Bisect shows:fa5c573455cf63090dbb6d167d4e5f1cb23daf72 is the first bad commit.
commit fa5c573455cf63090dbb6d167d4e5f1cb23daf72
Author:     Eric Anholt <eric@anholt.net>
AuthorDate: Sat Nov 17 13:11:13 2012 -0800
Commit:     Chris Wilson <chris@chris-wilson.co.uk>
CommitDate: Tue Nov 20 11:39:47 2012 +0000

    uxa: Refactor early-exit paths of uxa_try_driver_composite().

    Saves 200b of code at -O2.

output:
rendercheck 1.4
Render extension version 0.11
Window format: r8g8b8
Found server-supported format: a8
Found server-supported format: a8r8g8b8
Found server-supported format: x8r8g8b8
Found server-supported format: b8g8r8a8
Found server-supported format: b8g8r8x8
Found server-supported format: r8g8b8
Found server-supported format: b8g8r8
Found server-supported format: r5g5b5
Found server-supported format: b5g5r5
Found server-supported format: x1r5g5b5
Found server-supported format: x1b5g5r5
Found server-supported format: r5g6b5
Found server-supported format: b5g6r5
Found server-supported format: x8b8g8r8
Found server-supported format: x2r10g10b10
Found server-supported format: x2b10g10r10
Beginning blend test on a8
(EE)
(EE) Backtrace:
(EE) 0: X (xorg_backtrace+0x49) [0x80b2d49]
(EE) 1: X (0x8048000+0x6ffca) [0x80b7fca]
(EE) 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb774140c]
(EE) 3: /opt/X11R7/lib/xorg/modules/drivers/intel_drv.so (0xb7465000+0xa476) [0xb746f476]
(EE) 4: /opt/X11R7/lib/xorg/modules/drivers/intel_drv.so (0xb7465000+0xb113) [0xb7470113]
(EE) 5: /opt/X11R7/lib/xorg/modules/drivers/intel_drv.so (0xb7465000+0xfd050) [0xb7562050]
(EE) 6: X (0x8048000+0x138be7) [0x8180be7]
(EE) 7: X (CompositePicture+0x226) [0x8173976]
(EE) 8: X (0x8048000+0x13167c) [0x817967c]
(EE) 9: X (0x8048000+0x12c291) [0x8174291]
(EE) 10: X (0x8048000+0x3263d) [0x807a63d]
(EE) 11: X (0x8048000+0x1fbac) [0x8067bac]
(EE) 12: /lib/libc.so.6 (__libc_start_main+0xf3) [0x467896b3]
(EE) 13: X (0x8048000+0x1ff59) [0x8067f59]
(EE)
(EE) Segmentation fault at address 0x60000

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting

Reproduce steps:
----------------
1. start X
2. ./rendercheck -o src,over,overreverse,xor -t blend