Arghhh! This bug is caused by the fact that my output format requests:
FORMATOPTION "PALETTE=/u/data/maps/palette-google-agg.txt"
and the file does not exist. I ran into this earlier and have already
written a bug on it. Sorry the SEGV is non-intuitive to the cause and I
guess I'm slow on the up take :(
Back you your regularly scheduled programing. :)
-Steve W
Stephen Woodbridge wrote:
Moving this to the dev list ...
As a follow up to this it is reproducible on the current nightly tarball
also.
So in mapgd.c lines 3595+ are:
gdPImg =
gdImageCreatePaletteFromTrueColor(img,dither,colorsWanted);
/* It seems there is a bug in gd 2.0.33 and earlier that leaves the
colors open[] flag set to one. */
for( i = 0; i < gdPImg->colorsTotal; i++ )
gdPImg->open[i] = 0;
gdImagePngCtx( gdPImg, ctx );
gdImageDestroy( gdPImg );
It looks like the call to gdImageCreatePaletteFromTrueColor() is
returning NULL and mapserver is not checking and dealing with this
condition and passing gdPImg as a NULL pointer to gdImagePngCtx( gdPImg,
ctx ); which is causing a SEGV when it is accessed.
Running with packages on Debian Etch:
libgd2-noxpm/stable uptodate 2.0.33-5.2
libgd2-noxpm-dev/stable uptodate 2.0.33-5.2
I also ran into this same problem in brief experience with Fedora 8.
-Steve W
Stephen Woodbridge wrote:
Hi all,
Is this a known problem? I did could not find a ticket for it. I'm
trying the nightly build next.
-Steve
[EMAIL PROTECTED]:/u/woodbri/work/mapserver-5.0.2$ gdb mapserv
GNU gdb 6.4.90-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "x86_64-linux-gnu"...Using host
libthread_db library "/lib/libthread_db.so.1".
(gdb) run
QUERY_STRING='map=%2Fu%2Fdata%2Fmaps%2Fgoogle-agg.map&layers=all&map_imagetype=agg%2Fpng24&mode=map&mapext=-88.20558679540737+41.41346751789421+-87.09441320459264+42.28653248210579&imgext=-88.20558679540737+41.41346751789421+-87.09441320459264+42.28653248210579&map_size=700+550&imgx=350&imgy=275&imgxy=700+550'
> a
Starting program: /u/woodbri/work/mapserver-5.0.2/mapserv
QUERY_STRING='map=%2Fu%2Fdata%2Fmaps%2Fgoogle-agg.map&layers=all&map_imagetype=agg%2Fpng24&mode=map&mapext=-88.20558679540737+41.41346751789421+-87.09441320459264+42.28653248210579&imgext=-88.20558679540737+41.41346751789421+-87.09441320459264+42.28653248210579&map_size=700+550&imgx=350&imgy=275&imgxy=700+550'
> a
[Thread debugging using libthread_db enabled]
[New Thread 47982973225104 (LWP 20007)]
warning: Lowest section in /usr/lib/libicudata.so.36 is .hash at
0000000000000120
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47982973225104 (LWP 20007)]
0x00002ba3e360e733 in gdImagePngCtxEx () from /usr/lib/libgd.so.2
(gdb) where
#0 0x00002ba3e360e733 in gdImagePngCtxEx () from /usr/lib/libgd.so.2
#1 0x0000000000453bb3 in msSaveImageGDCtx (img=0x738040, ctx=0x6c1a90,
format=0x6247a0) at mapgd.c:3602
#2 0x0000000000453d3e in msSaveImageGD (img=0x738040,
filename=<value optimized out>, format=0x6247a0) at mapgd.c:3543
#3 0x0000000000454886 in msSaveImageAGG (img=0x738040, filename=0x0,
format=0x6247a0) at mapagg.cpp:2194
#4 0x0000000000428f5b in msSaveImage (map=0x61d560, img=0x738000,
filename=0x0) at maputil.c:604
#5 0x000000000040e8d4 in main (argc=<value optimized out>,
argv=<value optimized out>) at mapserv.c:1580
(gdb) q
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
