AthlonXP 2500+
NVIDIA GeForce 3 Ti 200
NOUVEAU driver, MESA OpenGL
X version:1.12.1.902

Segfault when Opera with HW accel was started. Behavior doesn't seem to be deterministic. Also VLC with GLX ext was running at the time.

[   735.606] Backtrace:
[   735.623] 0: /usr/bin/X (xorg_backtrace+0x49) [0xb7777099]
[   735.623] 1: /usr/bin/X (0xb75fa000+0x180a86) [0xb777aa86]
[   735.623] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb75db40c]
[   735.623] 3: /usr/lib/xorg/modules/extensions/libglx.so (0xb70dc000+0x4e95a) [0xb712a95a]
[   735.623] 4: /usr/lib/xorg/modules/extensions/libdri2.so (0xb7081000+0x1613) [0xb7082613]
[   735.623] 5: /usr/lib/xorg/modules/extensions/libdri2.so (0xb7081000+0x165f) [0xb708265f]
[   735.623] 6: /usr/bin/X (TraverseTree+0x25) [0xb7661525]
[   735.623] 7: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2SwapBuffers+0x23d) [0xb70838ed]
[   735.623] 8: /usr/lib/xorg/modules/extensions/libdri2.so (0xb7081000+0x3e9e) [0xb7084e9e]
[   735.623] 9: /usr/bin/X (0xb75fa000+0x3c365) [0xb7636365]
[   735.623] 10: /usr/bin/X (0xb75fa000+0x29e95) [0xb7623e95]
[   735.623] 11: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe6) [0xb72afe16]
[   735.623] 12: /usr/bin/X (0xb75fa000+0x2a1e9) [0xb76241e9]
[   735.623] 
[   735.623] Segmentation fault at address 0x2460059
[   735.623] 
Fatal server error:
[   735.623] Caught signal 11 (Segmentation fault). Server aborting