legend template crash with fast CGI

[Daniel Morissette]

Um.. it seems that Valgrind is finding something but we can't tell much 
from this Valgrind output. Perhaps try using 'valgrind --num-callers=20' 
to get a more complete call stack in the Valgrind output (note that 
since the error is reported inside valgrind's libc_freeres_wrapper that 
probably won't tell us much anyway, but we can try).

Would it be possible for you to package a test case (mapfile, data, html 
templates, etc.) to send us to reproduce this issue? Since this is 
happening when generating in mode=legend, we may be able get away with a 
test case with just the mapfile and templates (without the data) but I'm 
not sure.

Daniel


miguel coladas wrote:
> Thanks for your answer Daniel.
> 
> I'm testing with latest 4.10 beta and I'm having some problems
> 
> [miguel at mcoladas miguel]$ /usr/local/apache/fcgi-bin/mapserv -v
> MapServer version 4.10.0-beta1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG 
> OUTPUT=WBMP OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE 
> SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER 
> SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=FASTCGI INPUT=EPPL7 
> INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
> 
> With this version of mapserver I have run Valgrind at the command line 
> as you tell me:
> 
> [miguel at mcoladas miguel]$ valgrind /usr/local/apache/fcgi-bin/mapserv 
> QUERY_STRING="map=/usr/local/apache/htdocs/mapserver/map/client-draw.map&mode=legend&layers=provincias&mapext=458350+4613016+704030+4858696&mapsize=350+350&map_legend_template=../templates/legend.html" 
> 
> ==5322== Memcheck, a memory error detector for x86-linux.
> ==5322== Copyright (C) 2002-2003, and GNU GPL'd, by Julian Seward.
> ==5322== Using valgrind-2.1.0, a program supervision framework for 
> x86-linux.
> ==5322== Copyright (C) 2000-2003, and GNU GPL'd, by Julian Seward.
> ==5322== Estimated CPU clock rate is 1923 MHz
> ==5322== For more details, rerun with: -v
> ==5322==
> ==5322== Invalid free() / delete / delete[]
> ==5322==    at 0x4002B455: free (vg_replace_malloc.c:186)
> ==5322==    by 0x40BC4CBB: (within /lib/i686/libc-2.3.3.so)
> ==5322==    by 0x40BC4951: __libc_freeres (in /lib/i686/libc-2.3.3.so)
> ==5322==    by 0x4016AACC: vgPlain___libc_freeres_wrapper 
> (vg_intercept.c:172)
> ==5322==  Address 0x410897F8 is not stack'd, malloc'd or free'd
> ==5322==
> ==5322== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
> ==5322== malloc/free: in use at exit: 58517 bytes in 129 blocks.
> ==5322== malloc/free: 14327 allocs, 14199 frees, 4390277 bytes allocated.
> ==5322== For a detailed leak analysis,  rerun with: --leak-check=yes
> ==5322== For counts of detected errors, rerun with: -v
> 
> any idea?
> 
> 
> Daniel Morissette escribió:
> 
>> If you are on Linux then you could perhaps capture the URL of the 
>> request that causes the crash, and then run it under Valgrind 
>> (http://valgrind.org/) at the command line using something like:
>>
>> valgrind ./mapserv QUERY_STRING="map=....."
>>
>> You get the value of QUERY_STRING from the URL that causes the crash.
>>
>> If Valgrind reports errors then I suggest you create a bug report with 
>> the Valgrind output and a test case to reproduce (including mapfile, 
>> test dataset, etc. and the query_string that causes the crash).
>>
>> BTW, I would suggest that you test this against the latest 4.10 beta 
>> before reporting a bug.
>>
>> Daniel
>>
>>
>>
>> miguel coladas wrote:
>>
>>> Hi everyone,
>>>
>>> first i'm spanish, so sorry for my english.
>>> I'm using mapserver (4.8.3) in fast CGI mode (apache 2.0.59, 
>>> mod_fastcgi/2.4.2). I'm having some problems with this configuration 
>>> when i want use the legend template option.
>>> In the legend template file, when I put "[leg_layer_html opt_flag=1]" 
>>> the legend works correctly. However, when I put "[leg_layer_html 
>>> opt_flag=2]" mapserver crashes. In CGI mode, the same legend works 
>>> correctly. Other modes (map, query... works correctly too).
>>>
>>> The error_log of apache server:
>>>
>>> [Mon Aug 21 18:16:43 2006] [error] [client 192.168.1.3] Premature end 
>>> of script headers: mapserv
>>>
>>> I think this is a bug with mapserver in fast CGI mode. Can anyone 
>>> help me out with this?
>>>
>>> Many thanks,
>>>
>>>     Miguel Coladas
>>
>>
>>
> 


-- 
Daniel Morissette
http://www.mapgears.com/