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great! at the point where you see

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x863e0b70 (LWP 26134)]
0xb58e64fe in ?? () from /usr/lib/nvidia-current/libGL.so.1
(gdb) quit

instead of typing quit, type bt, e.g.:

(gdb) bt

and post the outputs. Thanks.

great! at the point where you see

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x863e0b70 (LWP 26134)]
0xb58e64fe in ?? () from /usr/lib/nvidia-current/libGL.so.1
(gdb) quit

instead of typing quit, type bt, e.g.:

(gdb) bt

and post the outputs. Thanks.

Looking at your log, the first segfault occurs:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x8685cb70 (LWP 5791)]
0xb58354fe in ?? () from /usr/lib/nvidia-current/libGL.so.1
(gdb) bt
#0  0xb58354fe in ?? () from /usr/lib/nvidia-current/libGL.so.1
(gdb) cont

instead of continuing as you did in the last line above, try

(gdb) info threads

and post outputs again.

By the way, you can google gdb to find out more about the debugger.