Mapscript ,Mono, Apache and Linux : a great story
Xavier Mauclaire
xavier.mauclaire at GEOTER.FR
Fri Jun 16 03:44:50 EDT 2006
Tamas
Thanks a lot for your answser.
All the layerObj object i use in my program are déclared in the mapfile so
i don't need to create layerObj from scratch using the constructor.
When you say that if a layerObj reference with a previously released native
memory segment, it may causing the error, what are the consequences for my
code ? Using the Dispose method is there the solution to avoid this problem
?
How can i get CVS code ?
Concernig the number of result, i test the resultCacheObj.numresults value.
it is not enough ?
Why this code works well under windows and scratches under linux ?
regards
-----------------------------------------
Xavier Mauclaire
-------------------------------------------------------
_____
De : Tamas Szekeres [mailto:szekerest at gmail.com]
Envoyé : vendredi 16 juin 2006 01:07
À : 'Xavier Mauclaire'; MAPSERVER-USERS at LISTS.UMN.EDU
Objet : RE: [UMN_MAPSERVER-USERS] Mapscript ,Mono, Apache and Linux : a
great story
Xavier,
All of the stack traces you reported represents me that you possibly have a
layerObj reference with a previoulsy released native memory segment.
This may occur if 2 or more layerObj references exclusively own the same
native memory and one of them is disposed or goes out of scope.
By this time i know one situation causing this problem is creating the layer
using the „layerObj(mapObj map)” constructor with non null map parameter.
(classobj(layerobj) and styleObj(classObj) are also suffer from this issue).
This problem was corrected in the current CVS HEAD.
So it would be important to know if you have some special handling of theese
objects in your application or all of theese object was created by parsing
the map file.
The given code fragment should theoretically work, however you should check
the number of the results before calling getResult.
Tamas
_____
From: Xavier Mauclaire [mailto:xavier.mauclaire at geoter.fr]
Sent: Thursday, June 15, 2006 10:55 AM
To: 'Tamas Szekeres'; MAPSERVER-USERS at LISTS.UMN.EDU
Subject: RE: [UMN_MAPSERVER-USERS] Mapscript ,Mono, Apache and Linux : a
great story
Hi Tamas
You will find next information which may help.
Thanks in advance for your help
The problem is that the server scratches randomly occurs. However, i saw in
the logs (if the variable MALLOC_CHECK_ equals 0) the segmentation fault
appears a lot of time in GetFeature function. I saw in the mailing List
emails concerning this problem with Java.
You will find next :
1) piece of code c#
2) mapfile used
3) apache2 error_log file
system informations :
apache 2.2 (ia upgrade apache yesterday 2.0.54 to 2.2)
Mono 1.1.13
mod_mono 1.1.14
mapserver 4.8.3 with mapscript csharp
postgresql 8.1.3
Postgis 1.1.1
gdal 1.3.1
geos 2.2.1
gd-2.0.33
libiconv 1.9.
Compilation options of Mapserver
./configure --with-gdal=/usr/local/bin/gdal-config
--with-ogr=/usr/local/bin/gdal-config
--with-postgis=/usr/local/pgsql/bin/pg_config --with-xpm=/usr/local/lib
--with-ming --with-png --with-jpeg --with-zlib --with-libiconv--without-tiff
--with-threads --with-geos=/usr/local/bin/geos-config --with-gif --with-proj
--with-gd=/usr/local -without-wms
I'm really need any help. I don't know what to do.
I'm sure that architecture choices i've done are good So it has to be
working :-)
regards
1) Piece of Code where
private shapeObj localiser_parcelle(Double dX, Double dY, out String
zParcelleIdent){
shapeObj pShape = null;
zParcelleIdent = "";
int liRes ;
try {
// recupération de la layer des parcelle
// celle dont le nom est CONST_LAYERNAME_PARCELLE
layerObj pLayerParcelle =
pMapQuery.getLayerByName(cConstantes.CONST_LAYERNAME_PARCELLE);
if(pLayerParcelle != null){
// creation du poitn de localisation
pointObj pPoint = new pointObj(dX, dY,0.0,0.0 );
// on recherche la parcelle au point cliqué
pLayerParcelle.queryByPoint(pMapQuery,pPoint,mapscript.MS_SINGLE,0);
resultCacheObj pRes = pLayerParcelle.getResults();
try{
resultCacheMemberObj pResMember = null;
if(pRes.numresults > 0) {
//on zoom sur la selection courante
pMapQuery.setExtent(pRes.bounds.minx,pRes.bounds.miny,pRes.bounds.maxx,pRes.
bounds.maxy);
pLayerParcelle.open();
try{
// récupération de la première parcelle
pResMember = pRes.getResult(0);
pShape = pLayerParcelle.getFeature(pResMember.shapeindex,
pResMember.tileindex);
if(pShape != null) {
// récupération de l'identifiant de la parcellle
Int32 liRang = -1;
// recherche rang champs
liRang = cRegInfos.SetLayerFieldRang(pLayerParcelle,
cRegInfo.CONST_IDPARCELLE);
zParcelleIdent = pShape.getValue(liRang);
} //end if
}finally{
pLayerParcelle.close();
} //e nd finally
} //e nd if
} finally {
pRes.Dispose();
pRes = null;
} //e nd finally
} else
throw new Exception("Couche des parcelles introuvable");
} finally{
} //end finally
return pShape;
} // end function
2) Mapfile
#
#
MAP
NAME MAPFILE
STATUS ON
SHAPEPATH "/home/raster971/"
# Map image size. Change size as desired
SIZE 750 750
IMAGETYPE png
# Extent based on full extent of QGIS view
EXTENT 635000 1768500 645000 1778700
SYMBOLSET "symbols/symbols.sym"
IMAGECOLOR 255 255 255
FONTSET "fonts/fonts.list"
#
# Start of web interface definition. Only the TEMPLATE parameter
# must be specified to display a map. See Mapserver documentation
#
WEB
IMAGEPATH ""
IMAGEURL "/tmp/"
END
OUTPUTFORMAT
NAME png
DRIVER "GD/PNG"
MIMETYPE "image/png"
EXTENSION "png"
IMAGEMODE RGB
TRANSPARENT OFF
END
SCALEBAR
IMAGECOLOR -1 -1 -1
OUTLINECOLOR 0 0 0
BACKGROUNDCOLOR 0 0 0
LABEL
COLOR 0 0 0
END
SIZE 150 5
COLOR 255 255 255
UNITS METERS
INTERVALS 4
TRANSPARENT on
STATUS EMBED
STYLE 0
POSITION LR
END
LAYER
NAME limites_communales
TYPE POLYGON
STATUS DEFAULT
CONNECTION "user=postgres password=trucmuche dbname=pprsaintclaude
host=localhost port=5432"
CONNECTIONTYPE postgis
DATA "wkb_geometry from limites_communales"
CLASS
NAME "commune"
END
END
LAYER
NAME zonage_reglementaire
TYPE POLYGON
STATUS DEFAULT
CONNECTION "user=postgres password=trucmuche dbname=pprsaintclaude
host=localhost port=5432"
CONNECTIONTYPE postgis
TEMPLATE "rien.htm"
DATA "wkb_geometry from zonage_reglementaire"
CLASSITEM "code_reg"
CLASS
NAME "0"
EXPRESSION "0"
COLOR 255 255 255
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "1"
EXPRESSION "1"
COLOR 160 224 255
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "2"
EXPRESSION "2"
COLOR 64 192 255
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "3"
EXPRESSION "3"
COLOR 0 0 255
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "4"
EXPRESSION "4"
COLOR 255 128 128
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "5"
EXPRESSION "5"
STYLE
SYMBOL "hatch45"
COLOR 255 0 0
SIZE 6
WIDTH 1
END
END
CLASS
NAME "6"
EXPRESSION "6"
COLOR 255 0 0
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "7"
EXPRESSION "7"
COLOR 96 160 0
OUTLINECOLOR -1 -1 -1
END
CLASS
NAME "8"
EXPRESSION "8"
COLOR 160 224 255
OUTLINECOLOR 0 255 255
END
END
LAYER
NAME parcelles
TYPE POLYGON
STATUS DEFAULT
TEMPLATE "rien.htm"
CONNECTION "user=postgres password=trucmuche dbname=pprsaintclaude
host=localhost port=5432"
CONNECTIONTYPE postgis
DATA "wkb_geometry from parcelles"
CLASS
NAME "parcelle"
COLOR -1 -1 -1
OUTLINECOLOR 0 0 0
END
END
END # Map File
3) Logs in the apache error_log file
The following logs show error information of two scratches (After each
segmentation fault i have to restart apache). You can notice the the error
does not appears et the same location (Garbage collector of mono ??)
[Fri Jun 16 10:41:41 2006] [notice] Apache/2.2.0 (Unix) mod_mono/1.1.14
configured -- resuming normal operations
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
Stacktrace:
in (wrapper managed-to-native) mapscriptPINVOKE:delete_layerObj
(System.Runtime.InteropServices.HandleRef) <0x4>
in (wrapper managed-to-native) mapscriptPINVOKE:delete_layerObj
(System.Runtime.InteropServices.HandleRef) <0xfe880ea1>
in layerObj:Dispose () <0x41>
in layerObj:Finalize () <0xe>
in (wrapper runtime-invoke) System.Object:runtime_invoke_void
(object,intptr,intptr,intptr) <0xc68dba2f>
Native stacktrace:
/usr/lib/pkgconfig/../../bin/mono(mono_handle_native_sigsegv+0xbb)
[0x814ee2b]
/usr/lib/pkgconfig/../../bin/mono [0x813b2cf]
[0xffffe440]
/usr/local/lib/libmapscript.so(msFree+0x21) [0x41a4c951]
/usr/local/lib/libmapscript.so(freeLayer+0x35) [0x41a50655]
/usr/local/lib/libmapscript.so(CSharp_delete_layerObj+0x7f) [0x41a28fef]
[0x42fdeb6c]
[0x4185f9aa]
[0x4185f947]
[0x4185f779]
/usr/lib/pkgconfig/../../bin/mono [0x813b180]
/usr/lib/pkgconfig/../../bin/mono(mono_runtime_invoke+0x27) [0x80d63f7]
/usr/lib/pkgconfig/../../bin/mono [0x80d2dc5]
/usr/lib/pkgconfig/../../bin/mono [0x8114cc7]
/usr/lib/pkgconfig/../../bin/mono [0x80d3b7c]
/usr/lib/pkgconfig/../../bin/mono [0x8099fb2]
/usr/lib/pkgconfig/../../bin/mono [0x80f5067]
/usr/lib/pkgconfig/../../bin/mono [0x8113175]
/lib/tls/libpthread.so.0 [0x400e5297]
/lib/tls/libc.so.6(__clone+0x5e) [0x401e037e]
[Fri Jun 16 10:43:55 2006] [notice] caught SIGTERM, shutting down
[Fri Jun 16 10:43:56 2006] [notice] Apache/2.2.0 (Unix) mod_mono/1.1.14
configured -- resuming normal operations
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
Another mod-mono-server with the same arguments is already running.
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
Stacktrace:
in (wrapper managed-to-native) mapscriptPINVOKE:layerObj_getFeature
(System.Runtime.InteropServices.HandleRef,int,int) <0x4>
in (wrapper managed-to-native) mapscriptPINVOKE:layerObj_getFeature
(System.Runtime.InteropServices.HandleRef,int,int) <0xffffff87>
in layerObj:getFeature (int,int) <0x27>
in siteflash.GetParcelleReglement:localiser_parcelle (double,double,string&)
<0x1df>
in siteflash.GetParcelleReglement:ProcessRequest (System.Web.HttpContext)
<0x56c>
in <Pipeline>__1:MoveNext () <0x10a0>
in System.Web.HttpApplication:Tick () <0x1f>
in System.Web.HttpApplication:Start (object) <0x37>
in
System.Web.HttpApplication:System.Web.IHttpAsyncHandler.BeginProcessRequest
(System.Web.HttpContext,System.AsyncCallback,object) <0x68>
in System.Web.HttpRuntime:RealProcessRequest (object) <0x1ab>
in System.Web.HttpRuntime:ProcessRequest (System.Web.HttpWorkerRequest)
<0x2c>
in Mono.WebServer.MonoWorkerRequest:ProcessRequest () <0xa>
in Mono.WebServer.BaseApplicationHost:ProcessRequest
(Mono.WebServer.MonoWorkerRequest) <0x43>
in Mono.WebServer.ModMonoApplicationHost:ProcessRequest
(int,string,string,string,string,string,int,string,int,string,string[],strin
g[]) <0xdc>
in (wrapper remoting-invoke-with-check)
Mono.WebServer.ModMonoApplicationHost:ProcessRequest
(int,string,string,string,string,string,int,string,int,string,string[],strin
g[]) <0xffffff0a>
in (wrapper xdomain-dispatch)
Mono.WebServer.ModMonoApplicationHost:ProcessRequest
(object,byte[]&,byte[]&,int,string,string,string,string,string,int,string,in
t,string,string[],string[]) <0xfffee09e>
in (wrapper xdomain-invoke)
Mono.WebServer.ModMonoApplicationHost:ProcessRequest
(int,string,string,string,string,string,int,string,int,string,string[],strin
g[]) <0xffffff6a>
in (wrapper remoting-invoke-with-check)
Mono.WebServer.ModMonoApplicationHost:ProcessRequest
(int,string,string,string,string,string,int,string,int,string,string[],strin
g[]) <0xffba766c>
in Mono.WebServer.ModMonoWorker:InnerRun (object) <0x404>
in Mono.WebServer.ModMonoWorker:Run (object) <0x17>
in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_object
(object) <0xffffff95>
in (wrapper runtime-invoke) System.Object:runtime_invoke_void_object
(object,intptr,intptr,intptr) <0xc7371b5f>
Native stacktrace:
/usr/lib/pkgconfig/../../bin/mono(mono_handle_native_sigsegv+0xbb)
[0x814ee2b]
/usr/lib/pkgconfig/../../bin/mono [0x813b2cf]
[0xffffe440]
/lib/tls/libc.so.6(malloc+0x86) [0x40187ea6]
/usr/local/pgsql/lib/libpq.so.4(pqResultAlloc+0xd5) [0x42025f25]
/usr/local/pgsql/lib/libpq.so.4(pqParseInput3+0x2b7) [0x4202e677]
/usr/local/pgsql/lib/libpq.so.4 [0x42026b04]
/usr/local/pgsql/lib/libpq.so.4(PQgetResult+0x9d) [0x4202810d]
/usr/local/pgsql/lib/libpq.so.4 [0x420282be]
/usr/local/lib/libmapscript.so(msPOSTGISLayerRetrievePGVersion+0x43)
[0x41ab70e3]
/usr/local/lib/libmapscript.so(msPOSTGISLayerRetrievePK+0x31) [0x41ab7331]
/usr/local/lib/libmapscript.so [0x41ab7aa4]
/usr/local/lib/libmapscript.so(msPOSTGISLayerGetShape+0x7d) [0x41ab7e5d]
/usr/local/lib/libmapscript.so(msPOSTGISLayerGetShapeVT+0x23) [0x41ab85b3]
/usr/local/lib/libmapscript.so(msLayerGetShape+0x2e) [0x41a6db3e]
/usr/local/lib/libmapscript.so(CSharp_layerObj_getFeature+0x46)
[0x41a29636]
[0x41861db2]
[0x41861cd0]
[0x41860ea8]
[0x4186048d]
[0x416f6421]
[0x416f52a8]
[0x416f1668]
[0x416f1549]
[0x41251854]
[0x41251385]
[0x41251343]
[0x41250544]
[0x41235535]
[0x41234c9c]
[0x41234a7b]
[0x41222807]
[0x41222643]
[0x40dc9bdd]
[0x40dc9730]
[0x40dc96f4]
[0x40dc964e]
/usr/lib/pkgconfig/../../bin/mono [0x813b180]
/usr/lib/pkgconfig/../../bin/mono(mono_runtime_invoke+0x27) [0x80d63f7]
/usr/lib/pkgconfig/../../bin/mono(mono_runtime_invoke_array+0x270)
[0x80d78c0]
/usr/lib/pkgconfig/../../bin/mono(mono_message_invoke+0xc5) [0x80d93d5]
/usr/lib/pkgconfig/../../bin/mono [0x80a509f]
/usr/lib/pkgconfig/../../bin/mono [0x80a58c9]
/usr/lib/pkgconfig/../../bin/mono [0x8099fb2]
/usr/lib/pkgconfig/../../bin/mono [0x80f5067]
/usr/lib/pkgconfig/../../bin/mono [0x8113175]
/lib/tls/libpthread.so.0 [0x400e5297]
/lib/tls/libc.so.6(__clone+0x5e) [0x401e037e]
-----------------------------------------
Xavier Mauclaire
-------------------------------------------------------
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