(gdb) run Starting program: ./mapserver-6.1-dev_rev11973/shp2img -m wmstest.map [Thread debugging using libthread_db enabled] Program received signal SIGSEGV, Segmentation fault. 0x080582a1 in msEncodeUrlExcept (data=0x0, except=0 '\000') at mapstring.c:1118 1118 for (inc=0, i=data; *i!='\0'; i++) (gdb) bt #0 0x080582a1 in msEncodeUrlExcept (data=0x0, except=0 '\000') at mapstring.c:1118 #1 0x0805824a in msEncodeUrl (data=0x0) at mapstring.c:1098 #2 0x08158370 in msSetWMSParamString (psWMSParams=0xbffff0f0, name=0x81e72c9 "INFO_FORMAT", value=0x0, urlencode=1) at mapwmslayer.c:117 #3 0x08159f22 in msBuildWMSLayerURL (map=0x82315b0, lp=0x8238be0, nRequestType=2, nClickX=0, nClickY=0, nFeatureCount=0, pszInfoFormat=0x0, bbox_ret=0x0, width_ret=0x0, height_ret=0x0, psWMSParams=0xbffff0f0) at mapwmslayer.c:837 #4 0x0815a336 in msPrepareWMSLayerRequest (nLayerId=0, map=0x82315b0, lp=0x8238be0, nRequestType=1, lastconnectiontype=MS_SHAPEFILE, psLastWMSParams=0xbffff1f0, nClickX=0, nClickY=0, nFeatureCount=0, pszInfoFormat=0x0, pasReqInfo=0x829d6d0, numRequests=0xbffff200) at mapwmslayer.c:979 #5 0x08095a9c in msDrawMap (map=0x82315b0, querymap=0) at mapdraw.c:334 #6 0x08056bff in main (argc=3, argv=0xbffff3a4) at shp2img.c:299