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mesa unichrome crash in draw_rgba_pixels when starting torcs

Submitted by Brice Goglin @bgoglin

Assigned to Default DRI bug account

Link to original bug (#13923)

Description

"Andrey" reported that torcs crashes right away. The debugging backtrace is:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb74c68d0 (LWP 5812)]
draw_rgba_pixels (ctx=0x805af30, x=320, y=240, width=800, height=600,
    format=6408, type=5121, unpack=0x8066b7c, pixels=0xb0fe8008)
    at swrast/s_drawpix.c:57
	in swrast/s_drawpix.c
(gdb) #0  draw_rgba_pixels (ctx=0x805af30, x=320, y=240, width=800, height=600,
    format=6408, type=5121, unpack=0x8066b7c, pixels=0xb0fe8008)
    at swrast/s_drawpix.c:57
#1  0xb73b97a9 in _swrast_DrawPixels (ctx=0x805af30, x=320, y=240, width=800,
    height=600, format=6408, type=5121, unpack=0x8066b7c, pixels=0xb0fe8008)
    at swrast/s_drawpix.c:900
#2  0xb74183f4 in _mesa_DrawPixels (width=800, height=600, format=6408,
    type=5121, pixels=0xb0fe8008) at main/drawpix.c:186
#3  0xb7ec57a2 in ?? () from /usr/lib/torcs/lib/libclient.so
#4  0xb7a6cc46 in ?? () from /usr/lib/libglut.so.3
#5  0x0804c410 in ?? ()
#6  0xb7f04780 in ?? () from /lib/ld-linux.so.2
#7  0x0804c410 in ?? ()
#8  0x0804c410 in ?? ()
#9  0xb7a6db40 in ?? () from /usr/lib/libglut.so.3
#10 0xbf876f18 in ?? ()
#11 0xb7a891b0 in ?? () from /usr/lib/libglut.so.3
#12 0x0804c410 in ?? ()
#13 0xbf876f18 in ?? ()
#14 0xbf876e48 in ?? ()
#15 0xb7a70142 in fgEnumWindows () from /usr/lib/libglut.so.3
Backtrace stopped: frame did not save the PC