Error: *** glibc detected *** double free or corruption (!prev)

[Dominik Schmid]

I have recompiled 4.0.1 with debug enabled. I then replaced the existing 
shp2img and mapserv.cgi with the newly compiled binaries. Next I ran 
shp2img with '-all_debug 9' and 'layer_debug 9' for the offending layer 
(data from zp_au). Since I have no idea what possible debug levels there 
are or what numbers can be set I have chosen to use a value of 9. Here's 
the output of shp2img:

[Mon Jul  9 12:18:03 2007].176107 msPOSTGISLayerOpen called 
datastatement: the_geom from zp_au
[Mon Jul  9 12:18:03 2007].185943 msPOSTGISLayerFreeItemInfo called
[Mon Jul  9 12:18:03 2007].186621 msPOSTGISLayerInitItemInfo called
[Mon Jul  9 12:18:03 2007].189609 msPOSTGISLayerWhichShapes called
[Mon Jul  9 12:18:03 2007].190383 msPOSTGISLayerParseData: unique column 
= OID, srid='', geom_column_name = the_geom, table_name=zp_au
[Mon Jul  9 12:18:03 2007].192024 query_string_0_6:DECLARE mycursor 
BINARY CURSOR FOR SELECT 
grundnut::text,asbinary(force_collection(force_2d(the_geom)),'NDR'),OID::text 
from zp_au WHERE the_geom && setSRID('BOX3D(760644.999999999 
249797.999999997,769195.000000001 261197.000000002)'::BOX3D, 
find_srid('','zp_au','the_geom') )
*** glibc detected *** double free or corruption (!prev): 0x0956da40 ***


Since this debug information doesn't help me pinpoint the problem I have 
to ask back here at the list if this tells anyone here anything.

Any help is appreciated.

Dominik


Umberto Nicoletti wrote:
> If you still have the 4.0.1 sources recompile them with enable debug
> and run shp2img under gdb. This at least will tell you where the
> double free is happening and then you might even be able to fix it.
> 
> Umberto
> 
> On 7/4/07, Dominik Schmid <dominik.schmid at ilu.ch> wrote:
>> Hi
>>
>> I have run into this persistent problem and I have already spent hours 
>> upon
>> hours without any result whatsoever. First of all my setup:
>>
>> - Centos 4.4
>> - apache 2.0.52
>> - php 5.1.6
>> - postgresql 8.1.8
>> - mapserver 4.0.1 (I know, I should update mapserver, but having to 
>> rebuild
>> all the legends in our system and possibly avoid some other side effects
>> would be a major headache and have so far kept me from doing this)
>> - gdal 1.4.0
>> - postgis 1.2.1
>> - geos 2.2.3
>> - proj 4.5.0
>> - glibc 2.3.4-2.25
>>
>> The error in the httpd error_log reads as stated in the subject.
>>
>> I have added some multipolygon data that I had previously obtained by
>> converting it from a shape file using shp2pgsql.
>>
>> The odd part about this error is, that I use the same syntax in the 
>> map file
>> as for a working multipolygon layer that I had imported using older 
>> versions
>> of postgis etc. and the older data works just fine.
>> I have reimported said working data from the original shape file and
>> compared it to the existing data in the working table. the_geom and other
>> relevant stuff is identical. And still the newly imported data 
>> produces this
>> error.
>>
>> I have checked projection, db access privs and just about everything else
>> that crossed my mind as playing a part to no avail.
>>
>> So, is this problem a known issue? What else could I try/look into? 
>> Any advice?
>>
>> Thanks
>> Dominik
>>
> 


-- 
Dominik Schmid
Dipl. Umweltnaturwissenschafter ETH

ilu AG
Zentralstrasse 2a
CH-8610 Uster

Tel: +41 44 / 944 55 56    (Direktwahl)
Tel: +41 44 / 944 55 55    (allgemein)
Fax: +41 44 / 944 55 66

mailto:dominik.schmid at ilu.ch
http://www.ilu.ch