z3ro@opteron ~/Mesa/progs/demos $ R300_SPAN_DISABLE_LOCKING=1 gdb ./glslnoise
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This GDB was configured as "x86_64-pc-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) run
Starting program: /home/z3ro/Mesa/progs/demos/glslnoise 
[Thread debugging using libthread_db enabled]
[New Thread 47636194510064 (LWP 6121)]
glCreateShaderObjectARB
glShaderSourceARB
glCompileShaderARB
glCreateProgramObjectARB
glAttachObjectARB
glLinkProgramARB
glUseProgramObjectARB
glGetUniformLocationARB
glUniform1fARB
glShaderSourceARB
glCompileShaderARB
glShaderSourceARB
glCompileShaderARB
glAttachObjectARB
glAttachObjectARB
glLinkProgramARB
glUseProgramObjectARB
glClearColor
glEnable
glEnable
GL_RENDERER = Mesa DRI R300 20040924 AGP 1x TCL
glViewport
glMatrixMode
glLoadIdentity
glFrustum
glMatrixMode
glLoadIdentity
glTranslatef
glClear
glUniform1fARB
glPushMatrix

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47636194510064 (LWP 6121)]
0x00002b532a82a620 in update_input_ptrs (ctx=0x0, start=0) at tnl/t_vertex.c:387
387           a[j].inputptr = ((GLubyte *)vptr->data) + start * vptr->stride;
(gdb) bt
#0  0x00002b532a82a620 in update_input_ptrs (ctx=0x0, start=0) at tnl/t_vertex.c:387
#1  0x00002b532a82a6de in _tnl_build_vertices (ctx=0x51dd50, start=0, end=341, newinputs=0) at tnl/t_vertex.c:409
#2  0x00002b532a81c73c in run_render (ctx=0x51dd50, stage=0x0) at tnl/t_vb_render.c:290
#3  0x00002b532a80ca64 in _tnl_run_pipeline (ctx=0x51dd50) at tnl/t_pipeline.c:159
#4  0x00002b532a834863 in _tnl_flush_vtx (ctx=0x51dd50) at tnl/t_vtx_exec.c:281
#5  0x00002b532a82d712 in _tnl_wrap_buffers (ctx=0x51dd50) at tnl/t_vtx_api.c:85
#6  0x00002b532a82d7c6 in _tnl_wrap_filled_vertex (ctx=0x0) at tnl/t_vtx_api.c:122
#7  0x00002b532a83046a in attrib_0_3 (v=0x7fff81e5fda0) at tnl/t_vtx_generic.c:100
#8  0x00002b532a8327aa in _tnl_Vertex3f (x=0, y=1, z=0) at tnl/t_vtx_generic.c:235
#9  0x00002b53290766f8 in glVertex3f (x=0.190983027, y=0.587785363, z=-1.90211296) at glapitemp.h:755
#10 0x00002b5328edd671 in gluSphere (qobj=0xbea5f0, radius=2, slices=20, stacks=-1076945986) at libutil/quad.c:992
#11 0x00002b5328d8923a in glutSolidSphere (radius=2, slices=20, stacks=10) at glut_shapes.c:89
#12 0x0000000000401442 in Redisplay () at glslnoise.c:55
#13 0x00002b5328d82a33 in processWindowWorkList (window=0x509640) at glut_event.c:1302
#14 0x00002b5328d82ad1 in __glutProcessWindowWorkLists () at glut_event.c:1349
#15 0x00002b5328d82b2f in glutMainLoop () at glut_event.c:1370
#16 0x0000000000401972 in main (argc=1, argv=0x7fff81e62e18) at glslnoise.c:214
(gdb)