Segmentation Faults on RH9

[Colin McGuigan]

So I'm compiling Mapserver 4.4.1 with the following configure:

./configure --with-gd --without-tiff --without-pdf --without-geos
--with-freetype --with-proj --with-gdal --with-postgis
--with-php=/usr/local/install/php-4.3.10
--with-php-regex-dir=/usr/local/install/php-4.3.10 --enable-debug

gd, proj, gdal, postgis, and php are all compiled on the machine (all in
/usr/local/lib with the exception of php).  There are no duplicated
libraries between /usr/lib and /usr/local/lib.  PHP is compiled as a
DSO, which according to HISTORY.TXT, now works.

Configuring, making, and installing all seem to go fine, but it doesn't
actually run.  The mapserv CGI never works; sometimes, it segfaults, and
sometimes it displays gibberish text.

Here's an example of the segfault from gdb.  The querystring is from the
Itasca demo:

[cmcguigan at localhost cgi-bin]# gdb mapserv
GNU gdb Red Hat Linux (5.3post-0.20021129.18rh)
Copyright 2003 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 "i386-redhat-linux-gnu"...
(gdb) run
"QUERY_STRING=layer=lakespy2&layer=dlgstln2&zoomsize=2&map=%2Fvar%2Fwww%2Fhtml%2Fworkshop%2Fitasca.map&program=%2Fcgi-bin%2Fmapserv&root=workshop&map_web_imagepath=%2Fvar%2Fwww%2Fhtml%2Fworkshop%2Ftmp%2F&map_web_imageurl=%2Fworkshop%2Ftmp%2F&map_web_template=itasca_basic.html"
Starting program: /var/www/cgi-bin/mapserv
"QUERY_STRING=layer=lakespy2&layer=dlgstln2&zoomsize=2&map=%2Fvar%2Fwww%2Fhtml%2Fworkshop%2Fitasca.map&program=%2Fcgi-bin%2Fmapserv&root=workshop&map_web_imagepath=%2Fvar%2Fwww%2Fhtml%2Fworkshop%2Ftmp%2F&map_web_imageurl=%2Fworkshop%2Ftmp%2F&map_web_template=itasca_basic.html"[New
Thread 1082405184 (LWP 25579)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1082405184 (LWP 25579)]
loadMapInternal (filename=0x80dc130 "/var/www/html/workshop/itasca.map",
     new_mappath=0x0) at mapfile.c:4173
4173      msyyin = fopen(filename, "r");
(gdb) backtrace
#0  loadMapInternal (filename=0x80dc130 "/var/www/html/workshop/itasca.map",
     new_mappath=0x0) at mapfile.c:4173
#1  0x0804cb78 in loadMap () at mapserv.c:248
#2  0x0804f3b5 in main (argc=135120568, argv=0xbfffe154) at mapserv.c:1146
#3  0x42015704 in __libc_start_main () from /lib/tls/libc.so.6

After different compiles, it has different segfaults.  The other one I
see often is in libc.regexec, but I don't have the trace handy.

After some compiles, though, it doesn't segfault.  Instead, it'll
display text like this: "NTSET "%s" : Unable to access file. ojection()
" which sure seems to indicate some sort of memory problem.

PHP Mapscript segfaults, as well.

[cmcguigan at localhost bin]# gdb php
GNU gdb Red Hat Linux (5.3post-0.20021129.18rh)
Copyright 2003 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 "i386-redhat-linux-gnu"...
(gdb) run /var/www/html/workshop/recipes/hello.phtml
Starting program: /usr/bin/php /var/www/html/workshop/recipes/hello.phtml
[New Thread 1078600352 (LWP 25600)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1078600352 (LWP 25600)]
0x406c09c0 in _init () from /usr/lib/php4/php_mapscript.so
(gdb) backtrace
#0  0x406c09c0 in _init () from /usr/lib/php4/php_mapscript.so
#1  0x406d86f4 in mapObj_new (filename=0x40747a3d "", new_path=0x0)
     at mapscript_i.c:100
#2  0x406c6e77 in php3_ms_map_new (ht=1081340215, return_value=0x822dc3c,
     this_ptr=0x0, return_value_used=1) at php_mapscript.c:1726
#3  0x0815ffd6 in execute (op_array=0x821ca0c)
     at /usr/local/install/php-4.3.10/Zend/zend_execute.c:1642
#4  0x08151e0f in zend_execute_scripts (type=8, retval=0x0, file_count=3)
     at /usr/local/install/php-4.3.10/Zend/zend.c:900
#5  0x0812af2f in php_execute_script (primary_file=0xbfffe590)
     at /usr/local/install/php-4.3.10/main/main.c:1736
#6  0x0816c1df in main (argc=2, argv=0xbfffe614)
     at /usr/local/install/php-4.3.10/sapi/cli/php_cli.c:822
#7  0x42015704 in __libc_start_main () from /lib/tls/libc.so.6
(gdb)

Anyways.  Has anyone seen anything like this before, and is there
anything I can do?

--Colin McGuigan