#0  p4_general_loop () at x86-64/xform4.S:67
#1  0x0000002a96e66121 in run_vertex_stage (ctx=0x6db870, stage=0x716980) at tnl/t_vb_vertex.c:144
#2  0x0000002a96e5b60a in _tnl_run_pipeline (ctx=0x6db870) at tnl/t_pipeline.c:158
#3  0x0000002a96e5bada in _tnl_draw_prims (ctx=0x6db870, arrays=0x721f40, prim=0x720724, nr_prims=4, ib=0x0, min_index=7489628,
    max_index=7432576) at tnl/t_draw.c:403
#4  0x0000002a96e4f069 in vbo_exec_vtx_flush (exec=0x7204e0) at vbo/vbo_context.h:87
#5  0x0000002a96e4df3c in vbo_exec_FlushVertices (ctx=0x741e70, flags=7432576) at vbo/vbo_exec_api.c:685
#6  0x0000002a96dc6fe4 in map2 (target=10742976, u1=0, u2=1, ustride=4, uorder=2, v1=1, v2=2, vstride=8, vorder=3, points=0xa3d9a0,
    type=5126) at main/eval.c:504
#7  0x0000002a96dc7190 in _mesa_Map2f (target=7609968, u1=1.8063426, u2=-0, ustride=7432576, uorder=7489628, v1=0, v2=0, vstride=13,
    vorder=384, points=0x2a97126ca0) at main/eval.c:525
#8  0x0000002a9717daf0 in Backend::surfpts (this=0x2a9af74188, type=3512, pts=0x72485c, ustride=7432576, vstride=384,
    uorder=-1760400224, vorder=3, ulo=1.8063426, uhi=-0, vlo=0, vhi=0) at libnurbs/internals/backend.cc:120
#9  0x0000002a9718de37 in Quilt::download (this=0xa3d4f0, backend=@0x2a9af74188) at libnurbs/internals/mapdesc.h:175
#10 0x0000002a9718de71 in Quilt::downloadAll (this=0x741e70, pta=0x7fbfffc758, ptb=0x7fbfffc750, backend=@0x2a9af74188)
    at libnurbs/internals/quilt.cc:164
#11 0x0000002a97193982 in Subdivider::splitInT (this=0x2a9af741d8, source=@0x7fbfffc880, start=2, end=-1073756328)
    at libnurbs/internals/subdivider.cc:448
#12 0x0000002a9719385f in Subdivider::splitInT (this=0x2a9af741d8, source=@0x7fbfffc960, start=0, end=2)
    at libnurbs/internals/subdivider.cc:430
#13 0x0000002a9719384d in Subdivider::splitInT (this=0x2a9af741d8, source=@0x7fbfffca30, start=0, end=4)
    at libnurbs/internals/subdivider.cc:429
#14 0x0000002a9719384d in Subdivider::splitInT (this=0x2a9af741d8, source=@0x7fbfffcb00, start=0, end=8)
    at libnurbs/internals/subdivider.cc:429
#15 0x0000002a9719384d in Subdivider::splitInT (this=0x2a9af741d8, source=@0x7fbfffcbd0, start=0, end=17)
    at libnurbs/internals/subdivider.cc:429
#16 0x0000002a97193b76 in Subdivider::splitInS (this=0x2a9af741d8, source=@0x7fbfffcbd0, start=1, end=1)
    at libnurbs/internals/subdivider.cc:410
#17 0x0000002a97193ab6 in Subdivider::splitInS (this=0x2a9af741d8, source=@0x7fbfffcc50, start=0, end=1)
    at libnurbs/internals/subdivider.cc:399
#18 0x0000002a97193aa4 in Subdivider::splitInS (this=0x2a9af741d8, source=@0x2a9af74ae0, start=0, end=2)
    at libnurbs/internals/subdivider.cc:398
#19 0x0000002a97193e8d in Subdivider::drawSurfaces (this=0x2a9af741d8, nuid=0) at libnurbs/internals/subdivider.cc:361
#20 0x0000002a9718abff in NurbsTessellator::do_endsurface (this=0x2a9af74010) at libnurbs/internals/nurbstess.cc:299
#21 0x0000002a95d23e2e in sogl_render_nurbs_surface (action=0x9e63a0, shape=0x6c7660, nurbsrenderer=0x2a9af74010, numuctrlpts=2,
    numvctrlpts=33, uknotvec=0x6c9820, vknotvec=0x6c9840, numuknot=4, numvknot=36, numsctrlpts=0, numtctrlpts=0, sknotvec=0x6c78b0,
    tknotvec=0x6c78d0, numsknot=1, numtknot=1, glrender=1, numcoordindex=0, coordindex=0x0, numtexcoordindex=0, texcoordindex=0x0)
    at SoGL.cpp:2299