Created attachment 55098 [details]
New piglit case to reproduce this regression

System Environment:
--------------------------
 Libdrm:		(master)2.4.29-17-ga9dd34a7ee9d03d357e15f045ab85a12f6f6e4b8
 Mesa:		(master)b5fd0e04a70d37a1bef9144096890e7940f9a200
 Xserver:		(master)xorg-server-1.11.99.901
 Xf86_video_intel:		(master)2.17.0-262-g770a953ff03bb8328c3f29e274d225528840f30c
 Cairo:		(master)6816f70da54e730e88b98c8592aa6fc84e082928
 Libva:		(vaapi-ext)4aeaa296febf2f71200ff30380902e2c80cbf679
 Libva_intel_driver:		(vaapi-ext)f0358f252e13a619550d37e5a720f9894c7aa18c
 Kernel:	(drm-intel-next) 097354eb14fa94d31a09c64d640643f58e4a5a9a

Bug detailed description:
-------------------------
This issue happens on Sandybridge and Ironlake
SIGBUS is triggered when trying glCopyTexture2D from fbo into a depth texture with max supported texture size
Related Oglconform test case are (GL30)fbo(scenario.shadowMaps)
backtrace is as following by the time of SIGBUG:
(gdb) bt
#0  unpack_uint_z_X8_Z24 (src=0xa6d9c000, dst=0x841e1b0, n=100) at main/format_unpack.c:2021
#1  0xb7a95ec4 in _mesa_unpack_uint_z_row (format=MESA_FORMAT_X8_Z24, n=100, src=0xa6d9c000, dst=0x841e1b0) at main/format_unpack.c:2074
#2  0xb7abf7d6 in fast_read_depth_pixels (ctx=0x80c4e80, x=<value optimized out>, y=0, width=100, height=100, type=5125, pixels=0x841e1b0, packing=0xbfffeb28) at main/readpix.c:84
#3  read_depth_pixels (ctx=0x80c4e80, x=<value optimized out>, y=0, width=100, height=100, type=5125, pixels=0x841e1b0, packing=0xbfffeb28) at main/readpix.c:125
#4  0xb7abffdd in _mesa_readpixels (ctx=0x80c4e80, x=0, y=0, width=100, height=100, format=6402, type=5125, packing=0x80d38fc, pixels=<value optimized out>) at main/readpix.c:564
#5  0xb79d867e in intelReadPixels (ctx=0x80c4e80, x=0, y=0, width=100, height=100, format=6402, type=5125, pack=0x80d38fc, pixels=0x841e1b0) at intel_pixel_read.c:200
#6  0xb7b94c79 in copy_tex_sub_image (ctx=0x80c4e80, dims=2, target=3553, level=0, xoffset=0, yoffset=0, zoffset=0, x=0, y=0, width=100, height=100) at drivers/common/meta.c:3149
#7  0xb79d98e4 in intelCopyTexSubImage2D (ctx=0x80c4e80, target=3553, level=0, xoffset=0, yoffset=0, x=0, y=0, width=100, height=100) at intel_tex_copy.c:208
#8  0xb7ad5542 in copyteximage (ctx=0x80c4e80, dims=2, target=3553, level=0, internalFormat=6402, x=0, y=0, width=100, height=100, border=0) at main/teximage.c:2837
#9  0x0806bd8a in piglit_display () at /home/shuang/piglit/tests/fbo/fbo-copyteximage-simple.c:90
#10 0x0806c413 in display () at /home/shuang/piglit/tests/util/piglit-framework.c:56
#11 0xb7eed5b6 in ?? () from /usr/lib/libglut.so.3
#12 0xb7ef13f8 in fgEnumWindows () from /usr/lib/libglut.so.3
#13 0xb7eedb13 in glutMainLoopEvent () from /usr/lib/libglut.so.3
#14 0xb7eee395 in glutMainLoop () from /usr/lib/libglut.so.3
#15 0x0806cb09 in main (argc=1, argv=0xbffff134) at /home/shuang/piglit/tests/util/piglit-framework.c:294


Reproduce steps:
1. compile and run attached new piglit test case


EXPECTED OUTCOME:
===================
get pass

ACTUAL OUTCOME:
===================
get SIGBUS