Created attachment 69256 [details]
example of the crash

Here a very simple program which illustrate a bug in
driver 2.1 Mesa 8.0.4 when applying a gamma value with opengl.

(The program is OK with driver NVIDIA).

In attachment, the file utc24.tga used by the program glut_gamma_bug.cpp.

Compile the program with the command:

g++ -L/usr/lib64 -lGL -lGLU -lglut -lX11 -lXi -lxcb-glx -lxcb-xlib -ldl glut_gamma_bug.cpp

Start it with: ./a.out

It will open a small window with an image composed of vertical strips.

Press the enter key (it apply a gamma correction of 3 to the image):

a) it will print a message: KEY_ENTER
b) it will print another message: current error GL: no error
c) the same image will be brightness
d) at the second message: current error GL: no error, it will crash


Crash in:

==17340== Invalid read of size 4
==17340==    at 0xE5D4ABE: set_sampler_views.isra.2 (u_atomic.h:62)
==17340==    by 0xE5B72E8: draw_textured_quad.isra.8 (st_cb_drawpixels.c:777)
==17340==    by 0xE5B9596: st_DrawPixels (st_cb_drawpixels.c:1156)
==17340==    by 0xE56BE98: _mesa_DrawPixels (drawpix.c:131)

=17340==  Address 0x101a95b0 is 0 bytes inside a block of size 96 free'd
==17340==    at 0x4C2A5C6: free (vg_replace_malloc.c:446)
==17340==    by 0xE5B95FB: st_DrawPixels (u_inlines.h:134)
==17340==    by 0xE56BE98: _mesa_DrawPixels (drawpix.c:131)


Thanks.