Infinite loop in mapserver::curve3_div::recursive_bezier with nan values drawing labels

[mapserver-bot]

Reporter: dfuhry
Date: 2011/05/07 - 20:09
Trac URL: http://trac.osgeo.org/mapserver/ticket/3862
#0 mapserver::calc_sq_distance (x1=-nan(0x8000000000000),

y1=-nan(0x8000000000000), x2=-nan(0x8000000000000), 
y2=-nan(0x8000000000000)) at renderers/agg/src/../include/agg_math.h:70

#1 0x0000000000599016 in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=30)
at renderers/agg/src/agg_curves.cpp:216

#2 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=29)
at renderers/agg/src/agg_curves.cpp:228

#3 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=28)
at renderers/agg/src/agg_curves.cpp:227

#4 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=27)
at renderers/agg/src/agg_curves.cpp:228

---Type to continue, or q to quit---
#5 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=26)
at renderers/agg/src/agg_curves.cpp:227

#6 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=25)
at renderers/agg/src/agg_curves.cpp:228

#7 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=24)
at renderers/agg/src/agg_curves.cpp:228

#8 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=23)
at renderers/agg/src/agg_curves.cpp:228

#9 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 

---Type to continue, or q to quit---
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=22)
at renderers/agg/src/agg_curves.cpp:227
#10 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=21)
at renderers/agg/src/agg_curves.cpp:228

#11 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=20)
at renderers/agg/src/agg_curves.cpp:227

#12 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=19)
at renderers/agg/src/agg_curves.cpp:227

#13 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=18)
at renderers/agg/src/agg_curves.cpp:227

#14 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

---Type to continue, or q to quit---
this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000),
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000),
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=17)
at renderers/agg/src/agg_curves.cpp:228
#15 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=16)
at renderers/agg/src/agg_curves.cpp:228

#16 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=15)
at renderers/agg/src/agg_curves.cpp:228

#17 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=14)
at renderers/agg/src/agg_curves.cpp:227

#18 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=13)

---Type to continue, or q to quit---
at renderers/agg/src/agg_curves.cpp:228
#19 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=12)
at renderers/agg/src/agg_curves.cpp:227

#20 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=11)
at renderers/agg/src/agg_curves.cpp:228

#21 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=10)
at renderers/agg/src/agg_curves.cpp:228

#22 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=9)
at renderers/agg/src/agg_curves.cpp:227

#23 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 

---Type to continue, or q to quit---
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000),
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=8)
at renderers/agg/src/agg_curves.cpp:228
#24 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=7)
at renderers/agg/src/agg_curves.cpp:228

#25 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=6)
at renderers/agg/src/agg_curves.cpp:228

#26 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=5)
at renderers/agg/src/agg_curves.cpp:227

#27 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=4)
at renderers/agg/src/agg_curves.cpp:227

---Type to continue, or q to quit---
#28 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=3)
at renderers/agg/src/agg_curves.cpp:228

#29 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=2)
at renderers/agg/src/agg_curves.cpp:227

#30 0x00000000005990ea in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=1)
at renderers/agg/src/agg_curves.cpp:228

#31 0x00000000005990ac in mapserver::curve3_div::recursive_bezier (

this=0x7fffffffd848, x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000), level=0)
at renderers/agg/src/agg_curves.cpp:227

#32 0x0000000000599178 in mapserver::curve3_div::bezier (this=0x7fffffffd848,

x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 

---Type to continue, or q to quit---
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000))
at renderers/agg/src/agg_curves.cpp:237
#33 0x0000000000598b54 in mapserver::curve3_div::init (this=0x7fffffffd848,

x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000))
at renderers/agg/src/agg_curves.cpp:136

#34 0x000000000055f922 in mapserver::curve3::init (this=0x7fffffffd7c8,

x1=-nan(0x8000000000000), y1=-nan(0x8000000000000), 
x2=-nan(0x8000000000000), y2=-nan(0x8000000000000), 
x3=-nan(0x8000000000000), y3=-nan(0x8000000000000))
at renderers/agg/include/agg_curves.h:502

#35 0x000000000056bd8c in mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>::vertex (

this=0x7fffffffd7b0, x=0x7fffffffd760, y=0x7fffffffd758)
at renderers/agg/include/agg_conv_curve.h:168

#36 0x00000000005678d6 in mapserver::conv_transform<mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>, mapserver::trans_affine>::vertex (this=0x7fffffffdab0,

x=0x7fffffffd760, y=0x7fffffffd758)
at renderers/agg/include/agg_conv_transform.h:43

#37 0x00000000005631ce in mapserver::path_base<mapserver::vertex_block_storage<double, 8u, 256u> >::concat_path<mapserver::conv_transform<mapserver::conv_curve<---Type to continue, or q to quit---

mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>, mapserver::trans_affine> > (this=0x7fffffffda80, vs=...,
path_id=0) at renderers/agg/include/agg_path_storage.h:726
#38 0x0000000000558cd7 in agg2RenderGlyphs (img=0x821a30,

x=-nan(0x8000000000000), y=-nan(0x8000000000000), style=0x7fffffffdc10, 
text=0x988020 "State Route 141") at mapagg.cpp:324

#39 0x000000000050586e in msDrawText (image=0x821a30, labelPnt=...,

string=0x988020 "State Route 141", label=0x8d59a0, fontset=0x81a3c8, 
scalefactor=1) at maprendering.c:826

#40 0x000000000048ec35 in msDrawLabelCache (image=0x821a30, map=0x81a360)

at mapdraw.c:2616

#41 0x0000000000483885 in msDrawMap (map=0x81a360, querymap=0) at mapdraw.c:475
#42 0x000000000041a550 in main (argc=2, argv=0x7fffffffe5c8) at mapserv.c:1407

[mapserver-bot]

Author: dfuhry
Date: 2011/05/07 - 20:15
gdb backtrace in description. One ugly fix is to guard against passing NaN values m_curve3.init in renderers/agg/include/agg_conv_curve.h. Hope there's enough information here for someone to implement a proper fix.

$ diff new/mapserver-6.0.0-rc1/renderers/agg/include/agg_conv_curve.h orig/mapserver-6.0.0-rc1/renderers/agg/include/agg_conv_curve.h
168,170c168
< if (!isnan(m_last_x) && !isnan(m_last_y) && !isnan(_x) && !isnan(_y) && !isnan(end_x) && !isnan(end_y))
< {

< m_curve3.init(m_last_x, m_last_y,

        m_curve3.init(m_last_x, m_last_y, 

174,176c172,173
< m_curve3.vertex(x, y); // First call returns path_cmd_move_to
< m_curve3.vertex(x, y); // This is the first vertex of the curve

< }

        m_curve3.vertex(x, y);    // First call returns path_cmd_move_to
        m_curve3.vertex(x, y);    // This is the first vertex of the curve

[mapserver-bot]

Author: tbonfort
Date: 2011/05/10 - 08:13
msDrawLabelCache is passing in nans to the renderers, so the problem is not only in the agg code.

Can you provide a test case that reproduces this please?

[tbonfort]

no response from original reporter, closing.

[dfuhry]

Hi Thomas, I hit this bug again in 6.2.1 on Linux. I tried creating a simple single layer shapefile testcase but the bug failed to manifest itself there. It is somewhat fickle so I assume might be dependent on previous items in the label cache.

Below is a backtrace and following that, gdb's "info locals" output from frames 41 (msDrawLabelCache), 40 (msDrawText), and 39 (agg2RenderGlyphs). The first obvious appearance of nan values are in msDrawLabelCache's metrics_poly.bounds.{minx,miny,maxx,maxy} and metrics_points[*].{x,y}, and the second are in msDrawText's s.rotation, x, and y. Not sure which (if either) of these is necessarily the root problem of the subsequent (near?) infinite recursion / looping.

$ gdb --args ./mapserv-dbg "QUERY_STRING=map=...&mode=tile&tilemode=gmap&tile=5343+11909+15"
...
#0  0x00007ffff79dc1e1 in mapserver::curve3_div::recursive_bezier (this=0x7fffffffda78, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff), level=32) at renderers/agg/src/agg_curves.cpp:157
...
#31 0x00007ffff79dc648 in mapserver::curve3_div::recursive_bezier (this=0x7fffffffda78, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff), level=1) at renderers/agg/src/agg_curves.cpp:225
#32 0x00007ffff79dc648 in mapserver::curve3_div::recursive_bezier (this=0x7fffffffda78, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff), level=0) at renderers/agg/src/agg_curves.cpp:225
#33 0x00007ffff79dc714 in mapserver::curve3_div::bezier (this=0x7fffffffda78, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff)) at renderers/agg/src/agg_curves.cpp:235
#34 0x00007ffff79dc0f0 in mapserver::curve3_div::init (this=0x7fffffffda78, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff)) at renderers/agg/src/agg_curves.cpp:136
#35 0x00007ffff79e8288 in mapserver::curve3::init (this=0x7fffffffd9f8, x1=-nan(0xfffffffffffff), y1=-nan(0xfffffffffffff), x2=-nan(0xfffffffffffff), y2=-nan(0xfffffffffffff), 
    x3=-nan(0xfffffffffffff), y3=-nan(0xfffffffffffff)) at renderers/agg/src/../include/agg_curves.h:502
#36 0x00007ffff7ad8268 in mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>::vertex(double*, double*) ()
   from /usr/local/lib/libmapserver-6.2.1.so
#37 0x00007ffff7ad4d70 in mapserver::conv_transform<mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>, mapserver::trans_affine>::vertex(double*, double*) () from /usr/local/lib/libmapserver-6.2.1.so
#38 0x00007ffff7ad0d62 in void mapserver::path_base<mapserver::vertex_block_storage<double, 8u, 256u> >::concat_path<mapserver::conv_transform<mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>, mapserver::trans_affine> >(mapserver::conv_transform<mapserver::conv_curve<mapserver::serialized_integer_path_adaptor<short, 6u>, mapserver::curve3, mapserver::curve4>, mapserver::trans_affine>&, unsigned int) () from /usr/local/lib/libmapserver-6.2.1.so
#39 0x00007ffff7ac790e in agg2RenderGlyphs (img=0x6082e0, x=-nan(0xfffffffffffff), y=-nan(0xfffffffffffff), style=0x7fffffffde50, text=0x6a6230 "SE McKinley Ave") at mapagg.cpp:377
#40 0x00007ffff79fd6d8 in msDrawText (image=0x6082e0, labelPnt=..., string=0x6a6230 "SE McKinley Ave", label=0x6a5fe0, fontset=0x6054e8, scalefactor=1) at maprendering.c:982
#41 0x00007ffff7ac60db in msDrawLabelCache (image=0x6082e0, map=0x605480) at mapdraw.c:3166
#42 0x00007ffff7ab8f45 in msDrawMap (map=0x605480, querymap=0) at mapdraw.c:488
#43 0x00007ffff7b67089 in msTileDraw (msObj=0x604040) at maptile.c:516
#44 0x00007ffff7b64cdb in msCGIDispatchImageRequest (mapserv=0x604040) at mapservutil.c:1459
#45 0x00007ffff7b657cf in msCGIDispatchRequest (mapserv=0x604040) at mapservutil.c:1690
#46 0x000000000040152c in main (argc=2, argv=0x7fffffffe5d8) at mapserv.c:259

(gdb) f 41
#41 0x00007ffff7ac60db in msDrawLabelCache (image=0x6082e0, map=0x605480) at mapdraw.c:3166
3166                    msDrawText(image, labelPtr->annopoint, labelPtr->annotext, labelPtr, &(map->fontset), layerPtr->scalefactor); /* actually draw the label */
Current language:  auto
The current source language is "auto; currently c".
(gdb) info locals
scalefactor = 1
size = 10
cacheslot = 0x605590
ll = 0
marker_offset_x = 0
value = 0x0
cachePtr = 0x65bed0
classPtr = 0x632c60
r = {minx = 1, miny = -11, maxx = 103, maxy = 1}
label_marker_line = {numpoints = 5, point = 0x7fffffffe0c0}
marker_offset_y = 0
label_offset_x = 0
i = -136395790
marker_poly = {numlines = 0, numvalues = 0, line = 0x7fffffffe1e0, values = 0x0, geometry = 0x0, renderer_cache = 0x0, bounds = {minx = -1, miny = -1, maxx = -1, maxy = -1}, type = 2, index = -1, 
  tileindex = -1, classindex = 0, text = 0x0, scratch = 0, resultindex = -1}
label_marker_points = {{x = 1.3505032603810789e-315, y = 6.9533490682342454e-310}, {x = 0, y = 0}, {x = 6.9531436082559572e-310, y = 0}, {x = 4.9406564584124654e-324, y = 6.953349175449949e-310}, 
  {x = 6.9533558074626765e-310, y = 6.9533491749792032e-310}}
metrics_poly = {numlines = 1, numvalues = 0, line = 0x7fffffffe1c0, values = 0x0, geometry = 0x0, renderer_cache = 0x0, bounds = {minx = -nan(0xfffffffffffff), miny = -nan(0xfffffffffffff), 
    maxx = -nan(0xfffffffffffff), maxy = -nan(0xfffffffffffff)}, type = 2, index = -1, tileindex = -1, classindex = 0, text = 0x0, scratch = 0, resultindex = -1}
label_offset_y = 0
labelPtr = 0x6a5fe0
label_mindistance = 1500
layerPtr = 0x6319b0
priority = 4
marker_line = {numpoints = 5, point = 0x7fffffffe110}
metrics_line = {numpoints = 5, point = 0x7fffffffe070}
l = 28
marker_points = {{x = 4.3971842479870942e-322, y = 6.9533451137324208e-310}, {x = 0, y = 6.953349175492241e-310}, {x = 6.9533558074508189e-310, y = 6.9533558074520046e-310}, {
    x = 4.2439882697144549e-314, y = 6.9533488423168494e-310}, {x = 3.115617487926568e-317, y = 6.9533451138746129e-310}}
label_marker_poly = {numlines = 0, numvalues = 0, line = 0x7fffffffe1d0, values = 0x0, geometry = 0x0, renderer_cache = 0x0, bounds = {minx = -1, miny = -1, maxx = -1, maxy = -1}, type = 2, 
  index = -1, tileindex = -1, classindex = 0, text = 0x0, scratch = 0, resultindex = -1}
metrics_points = {{x = -nan(0xfffffffffffff), y = -nan(0xfffffffffffff)}, {x = -nan(0xfffffffffffff), y = -nan(0xfffffffffffff)}, {x = -nan(0xfffffffffffff), y = -nan(0xfffffffffffff)}, {
    x = -nan(0xfffffffffffff), y = -nan(0xfffffffffffff)}, {x = -nan(0xfffffffffffff), y = -nan(0xfffffffffffff)}}
label_buffer = 0
nReturnVal = 0
__PRETTY_FUNCTION__ = "msDrawLabelCache"

(gdb) f 40
#40 0x00007ffff79fd6d8 in msDrawText (image=0x6082e0, labelPnt=..., string=0x6a6230 "SE McKinley Ave", label=0x6a5fe0, fontset=0x6054e8, scalefactor=1) at maprendering.c:982
982         return renderer->renderGlyphs(image,x,y,&s,string);
Current language:  auto
The current source language is "auto; currently c".
(gdb) info locals
s = {fonts = {0x618e10 "/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf", 0x0, 0x0, 0x0, 0x0}, numfonts = 1, size = 10, rotation = -nan(0xfffffffffffff), color = 0x6a5ff4, outlinewidth = 0, 
  outlinecolor = 0x0, antialias = -1}
renderer = 0x608650
x = -nan(0xfffffffffffff)
y = -nan(0xfffffffffffff)
nReturnVal = -1


(gdb) f 39
#39 0x00007ffff7ac790e in agg2RenderGlyphs (img=0x6082e0, x=-nan(0xfffffffffffff), y=-nan(0xfffffffffffff), style=0x7fffffffde50, text=0x6a6230 "SE McKinley Ave") at mapagg.cpp:377
377       glyphs.concat_path(trans_c);
Current language:  auto
The current source language is "auto; currently c++".
(gdb) info locals
trans_c = {m_source = 0x7fffffffd9e0, m_trans = 0x7fffffffdc80}
curfontidx = 0
fx = -nan(0xfffffffffffff)
r = 0x66df50
unicode = 83
m_curves = {m_source = 0x63ab28, m_last_x = -nan(0xfffffffffffff), m_last_y = -nan(0xfffffffffffff), m_curve3 = {m_curve_inc = {m_num_steps = 0, m_step = -1, m_scale = 1, 
      m_start_x = 2.4703282292062327e-323, m_start_y = 3.3369668023137799e-317, m_end_x = 5.2370958459172134e-322, m_end_y = 1.3486015868882666e-319, m_fx = 6.9533491548940514e-310, 
      m_fy = 3.3369668023137799e-317, m_dfx = 3.7020694570149609e-317, m_dfy = 3.3379154083537951e-317, m_ddfx = 3.3380735093604643e-317, m_ddfy = 3.9525251667299724e-323, 
      m_saved_fx = 4.5454039417394682e-322, m_saved_fy = 3.359741252324478e-317, m_saved_dfx = 3.2258692249273339e-317, m_saved_dfy = 3.0138004396316039e-322}, m_curve_div = {
      m_approximation_scale = 1, m_distance_tolerance_square = 0.25, m_angle_tolerance = 0, m_count = 0, m_points = {m_size = 1, m_num_blocks = 1, m_max_blocks = 64, m_blocks = 0x60c320, 
        m_block_ptr_inc = 64}}, m_approximation_method = mapserver::curve_div}, m_curve4 = {m_curve_inc = {m_num_steps = 0, m_step = -1, m_scale = 1, m_start_x = 9.8461219881341052e-312, 
      m_start_y = 3.2258692249273339e-317, m_end_x = 7.2500037626604419, m_end_y = 6.9533558073765114e-310, m_fx = 6.9533558073769067e-310, m_fy = 3.2258692249273339e-317, 
      m_dfx = 6.9533558073844165e-310, m_dfy = 6.953348861569896e-310, m_ddfx = 1.3910955607251939e-309, m_ddfy = 3.1298149583254621e-317, m_dddfx = 3.7004884469482689e-317, 
      m_dddfy = 3.1301944007414681e-317, m_saved_fx = 3.2258692249273339e-317, m_saved_fy = 3.2258455097763335e-317, m_saved_dfx = 2.1219957909652723e-314, m_saved_dfy = 3.3380142214829634e-317, 
      m_saved_ddfx = 3.6928837885274805e-317, m_saved_ddfy = 0}, m_curve_div = {m_approximation_scale = 1, m_distance_tolerance_square = 4.3458473798968777e-311, m_angle_tolerance = 0, 
      m_cusp_limit = 0, m_count = 0, m_points = {m_size = 0, m_num_blocks = 0, m_max_blocks = 0, m_blocks = 0x0, m_block_ptr_inc = 64}}, m_approximation_method = mapserver::curve_div}}
mtx = {sx = nan(0xfffffffffffff), shy = nan(0xfffffffffffff), shx = nan(0xfffffffffffff), sy = nan(0xfffffffffffff), tx = nan(0xfffffffffffff), ty = nan(0xfffffffffffff)}
fy = -nan(0xfffffffffffff)
utfptr = 0x6a6231 "E McKinley Ave"
glyphs = {m_vertices = {m_total_vertices = 2, m_total_blocks = 1, m_max_blocks = 256, m_coord_blocks = 0x60b310, m_cmd_blocks = 0x60bb10}, m_iterator = 0}
cache = 0x63a000
glyph = 0x71cdc0