Matplotlib crash in savefig (png)

[silyko]

The version of matplotlib included in the 64-bit installer (matplotlib version 1.3.1) causes python to crash when savefig is applied to save a png. This happens both from the GUI and when applied programatically. Does not happen e.g. for a pdf or jpeg, so seemingly a defect in a (lib)png dependency. Using backend "Qt4Agg".

[warrieka]

I am experiencing this problem in my qgisplugin to, as do my users, can the version of mathplotlib / libpng be upgraded in the installer?

These are the content of error rapport in visual studio:

Dump Summary

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Dump File: qgis-20150317-084708-5816-5832-exported.dmp : C:\Users\SA64489\AppData\Local\Temp\qgis-20150317-084708-5816-5832-exported.dmp Last Write Time: 17/03/2015 8:47:12 Process Name: qgis-bin.exe : C:\OSGeo4W64\bin\qgis-bin.exe Process Architecture: x64 Exception Code: 0xC0000005 Exception Information: The thread tried to read from or write to a virtual address for which it does not have the appropriate access. Heap Information: Not Present

System Information

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OS Version: 6.1.7601 CLR Version(s):

Modules

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Module Name Module Path Module Version

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qgis-bin.exe C:\OSGeo4W64\bin\qgis-bin.exe 0.0.0.0 ntdll.dll C:\Windows\System32\ntdll.dll 6.1.7601.18247 kernel32.dll C:\Windows\System32\kernel32.dll 6.1.7601.18015 KERNELBASE.dll C:\Windows\System32\KERNELBASE.dll 6.1.7601.18015 shell32.dll C:\Windows\System32\shell32.dll 6.1.7601.17514 msvcrt.dll C:\Windows\System32\msvcrt.dll 7.0.7600.16385 shlwapi.dll C:\Windows\System32\shlwapi.dll 6.1.7601.17514 gdi32.dll C:\Windows\System32\gdi32.dll 6.1.7601.17514 user32.dll C:\Windows\System32\user32.dll 6.1.7601.17514 lpk.dll C:\Windows\System32\lpk.dll 6.1.7600.16385 usp10.dll C:\Windows\System32\usp10.dll 1.626.7601.17514 qwt5.dll C:\OSGeo4W64\bin\qwt5.dll 5.2.3.0 QtGui4.dll C:\OSGeo4W64\bin\QtGui4.dll 4.8.5.0 comdlg32.dll C:\Windows\System32\comdlg32.dll 6.1.7601.17514 comctl32.dll C:\Windows\winsxs\amd64_microsoft.windows.common-controls_6595b64144ccf1df_5.82.7601.17514_none_a4d6a923711520a9\comctl32.dll 5.82.7601.17514 advapi32.dll C:\Windows\System32\advapi32.dll 6.1.7601.18247 sechost.dll C:\Windows\System32\sechost.dll 6.1.7600.16385 rpcrt4.dll C:\Windows\System32\rpcrt4.dll 6.1.7601.17514 oleaut32.dll C:\Windows\System32\oleaut32.dll 6.1.7601.17514 ole32.dll C:\Windows\System32\ole32.dll 6.1.7601.17514 imm32.dll C:\Windows\System32\imm32.dll 6.1.7600.16385 msctf.dll C:\Windows\System32\msctf.dll 6.1.7600.16385 winmm.dll C:\Windows\System32\winmm.dll 6.1.7600.16385 winspool.drv C:\Windows\System32\winspool.drv 6.1.7601.17514 libpng16.dll C:\OSGeo4W64\bin\libpng16.dll 0.0.0.0 zlib1.dll C:\OSGeo4W64\bin\zlib1.dll 1.2.8.0 msvcr100.dll C:\OSGeo4W64\bin\msvcr100.dll 10.0.40219.1 QtCore4.dll C:\OSGeo4W64\bin\QtCore4.dll 4.8.5.0 ws2_32.dll C:\Windows\System32\ws2_32.dll 6.1.7601.17514 nsi.dll C:\Windows\System32\nsi.dll 6.1.7600.16385 msvcp100.dll C:\OSGeo4W64\bin\msvcp100.dll 10.0.40219.1 QtSql4.dll C:\OSGeo4W64\bin\QtSql4.dll 4.8.5.0 libpq.dll C:\OSGeo4W64\bin\libpq.dll 9.2.4.13228 ssleay32.dll C:\OSGeo4W64\bin\ssleay32.dll 1.0.1.7 libeay32.dll C:\OSGeo4W64\bin\libeay32.dll 1.0.1.7 msvcr90.dll C:\Windows\winsxs\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\msvcr90.dll 9.0.30729.6161 wsock32.dll C:\Windows\System32\wsock32.dll 6.1.7600.16385 secur32.dll C:\Windows\System32\secur32.dll 6.1.7601.17514 sspicli.dll C:\Windows\System32\sspicli.dll 6.1.7601.17514 Wldap32.dll C:\Windows\System32\Wldap32.dll 6.1.7601.17514 odbc32.dll C:\Windows\System32\odbc32.dll 6.1.7601.17514 QtWebKit4.dll C:\OSGeo4W64\bin\QtWebKit4.dll 4.9.4.0 sqlite3.dll C:\OSGeo4W64\bin\sqlite3.dll 0.0.0.0 version.dll C:\Windows\System32\version.dll 6.1.7600.16385 QtNetwork4.dll C:\OSGeo4W64\bin\QtNetwork4.dll 4.8.5.0 gdal111.dll C:\OSGeo4W64\bin\gdal111.dll 1.11.2.0 ogdi.dll C:\OSGeo4W64\bin\ogdi.dll 0.0.0.0 expat.dll C:\OSGeo4W64\bin\expat.dll 0.0.0.0 proj.dll C:\OSGeo4W64\bin\proj.dll 0.0.0.0 xerces-c_3_1.dll C:\OSGeo4W64\bin\xerces-c_3_1.dll 3.1.1.0 jpeg.dll C:\OSGeo4W64\bin\jpeg.dll 0.0.0.0 netcdf.dll C:\OSGeo4W64\bin\netcdf.dll 0.0.0.0 libcurl.dll C:\OSGeo4W64\bin\libcurl.dll 7.31.0.0 normaliz.dll C:\Windows\System32\normaliz.dll 6.1.7600.16385 geotiff.dll C:\OSGeo4W64\bin\geotiff.dll 0.0.0.0 libtiff.dll C:\OSGeo4W64\bin\libtiff.dll 0.0.0.0 jpeg12.dll C:\OSGeo4W64\bin\jpeg12.dll 0.0.0.0 spatialite.dll C:\OSGeo4W64\bin\spatialite.dll 0.0.0.0 geos_c.dll C:\OSGeo4W64\bin\geos_c.dll 0.0.0.0 freexl.dll C:\OSGeo4W64\bin\freexl.dll 0.0.0.0 iconv.dll C:\OSGeo4W64\bin\iconv.dll 0.0.0.0 libxml2.dll C:\OSGeo4W64\bin\libxml2.dll 0.0.0.0 libmysql.dll C:\OSGeo4W64\bin\libmysql.dll 6.1.0.0 hdf5.dll C:\OSGeo4W64\bin\hdf5.dll 0.0.0.0 szip.dll C:\OSGeo4W64\bin\szip.dll 0.0.0.0 openjp2.dll C:\OSGeo4W64\bin\openjp2.dll 0.0.0.0 qgis_core.dll C:\OSGeo4W64\apps\qgis\bin\qgis_core.dll 0.0.0.0 QtXml4.dll C:\OSGeo4W64\bin\QtXml4.dll 4.8.5.0 QtSvg4.dll C:\OSGeo4W64\bin\QtSvg4.dll 4.8.5.0 spatialindex-64.dll C:\OSGeo4W64\bin\spatialindex-64.dll 0.0.0.0 msvcp120.dll C:\Windows\System32\msvcp120.dll 12.0.21005.1 msvcr120.dll C:\Windows\System32\msvcr120.dll 12.0.21005.1 qgis_gui.dll C:\OSGeo4W64\apps\qgis\bin\qgis_gui.dll 0.0.0.0 qscintilla2.dll C:\OSGeo4W64\bin\qscintilla2.dll 0.0.0.0 qgis_analysis.dll C:\OSGeo4W64\apps\qgis\bin\qgis_analysis.dll 0.0.0.0 dbghelp.dll C:\Windows\System32\dbghelp.dll 6.1.7601.17514 AMInit64.dll C:\Windows\System32\AMInit64.dll 7.5.1597.0 odbcint.dll C:\Windows\System32\odbcint.dll 6.1.7600.16385 CRYPTBASE.dll C:\Windows\System32\CRYPTBASE.dll 6.1.7600.16385 uxtheme.dll C:\Windows\System32\uxtheme.dll 6.1.7600.16385 userenv.dll C:\Windows\System32\userenv.dll 6.1.7601.17514 profapi.dll C:\Windows\System32\profapi.dll 6.1.7600.16385 qgif4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qgif4.dll 4.8.5.0 qico4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qico4.dll 4.8.5.0 qjpeg4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qjpeg4.dll 4.8.5.0 qmng4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qmng4.dll 4.8.5.0 qsvg4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qsvg4.dll 4.8.5.0 qtga4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qtga4.dll 4.8.5.0 qtiff4.dll C:\OSGeo4W64\apps\Qt4\plugins\imageformats\qtiff4.dll 4.8.5.0 BtMmHook.dll C:\Program Files\WIDCOMM\Bluetooth Software\BtMmHook.dll 6.3.0.6900 psapi.dll C:\Windows\System32\psapi.dll 6.1.7600.16385 clbcatq.dll C:\Windows\System32\clbcatq.dll 2001.12.8530.16385 qsvgicon4.dll C:\OSGeo4W64\apps\Qt4\plugins\iconengines\qsvgicon4.dll 4.8.5.0 qgenericbearer4.dll C:\OSGeo4W64\apps\Qt4\plugins\bearer\qgenericbearer4.dll 4.8.5.0 IPHLPAPI.DLL C:\Windows\System32\IPHLPAPI.DLL 6.1.7601.17514 winnsi.dll C:\Windows\System32\winnsi.dll 6.1.7600.16385 dhcpcsvc.dll C:\Windows\System32\dhcpcsvc.dll 6.1.7600.16385 dhcpcsvc6.DLL C:\Windows\System32\dhcpcsvc6.DLL 6.1.7600.16385 qnativewifibearer4.dll C:\OSGeo4W64\apps\Qt4\plugins\bearer\qnativewifibearer4.dll 4.8.5.0 wlanapi.dll C:\Windows\System32\wlanapi.dll 6.1.7600.16385 wlanutil.dll C:\Windows\System32\wlanutil.dll 6.1.7600.16385 coordinatecaptureplugin.dll C:\OSGeo4W64\apps\qgis\plugins\coordinatecaptureplugin.dll 0.0.0.0 delimitedtextprovider.dll C:\OSGeo4W64\apps\qgis\plugins\delimitedtextprovider.dll 0.0.0.0 dxf2shpconverterplugin.dll C:\OSGeo4W64\apps\qgis\plugins\dxf2shpconverterplugin.dll 0.0.0.0 evis.dll C:\OSGeo4W64\apps\qgis\plugins\evis.dll 0.0.0.0 gdalprovider.dll C:\OSGeo4W64\apps\qgis\plugins\gdalprovider.dll 0.0.0.0 gdal_ECW_JP2ECW.dll C:\OSGeo4W64\bin\gdalplugins\gdal_ECW_JP2ECW.dll 0.0.0.0 NCSEcw.dll C:\OSGeo4W64\bin\NCSEcw.dll 5.0.1.1346 crypt32.dll C:\Windows\System32\crypt32.dll 6.1.7601.17514 msasn1.dll C:\Windows\System32\msasn1.dll 6.1.7601.17514 imagehlp.dll C:\Windows\System32\imagehlp.dll 6.1.7601.17514 gdal_GEOR.dll C:\OSGeo4W64\bin\gdalplugins\gdal_GEOR.dll 0.0.0.0 oci.dll C:\OSGeo4W64\bin\oci.dll 12.1.0.0 gdal_MG4Lidar.dll C:\OSGeo4W64\bin\gdalplugins\gdal_MG4Lidar.dll 0.0.0.0 lti_lidar_dsdk.dll C:\OSGeo4W64\bin\lti_lidar_dsdk.dll 1.1.1.3422 gdal_MrSID.dll C:\OSGeo4W64\bin\gdalplugins\gdal_MrSID.dll 0.0.0.0 lti_dsdk.dll C:\OSGeo4W64\bin\lti_dsdk.dll 8.5.0.3422 georefplugin.dll C:\OSGeo4W64\apps\qgis\plugins\georefplugin.dll 0.0.0.0 gsl.dll C:\OSGeo4W64\bin\gsl.dll 0.0.0.0 cblas.dll C:\OSGeo4W64\bin\cblas.dll 0.0.0.0 globeplugin.dll C:\OSGeo4W64\apps\qgis\plugins\globeplugin.dll 0.0.0.0 QtOpenGL4.dll C:\OSGeo4W64\bin\QtOpenGL4.dll 4.8.5.0 opengl32.dll C:\Windows\System32\opengl32.dll 6.1.7600.16385 glu32.dll C:\Windows\System32\glu32.dll 6.1.7600.16385 ddraw.dll C:\Windows\System32\ddraw.dll 6.1.7600.16385 dciman32.dll C:\Windows\System32\dciman32.dll 6.1.7600.16385 setupapi.dll C:\Windows\System32\setupapi.dll 6.1.7601.17514 cfgmgr32.dll C:\Windows\System32\cfgmgr32.dll 6.1.7601.17514 devobj.dll C:\Windows\System32\devobj.dll 6.1.7600.16385 dwmapi.dll C:\Windows\System32\dwmapi.dll 6.1.7600.16385 osg97-osgDB.dll C:\OSGeo4W64\bin\osg97-osgDB.dll 3.1.7.97 osg97-osg.dll C:\OSGeo4W64\bin\osg97-osg.dll 3.1.7.97 ot12-OpenThreads.dll C:\OSGeo4W64\bin\ot12-OpenThreads.dll 2.6.0.12 osg97-osgUtil.dll C:\OSGeo4W64\bin\osg97-osgUtil.dll 3.1.7.97 osg97-osgGA.dll C:\OSGeo4W64\bin\osg97-osgGA.dll 3.1.7.97 osg97-osgQt.dll C:\OSGeo4W64\bin\osg97-osgQt.dll 3.1.7.97 osg97-osgViewer.dll C:\OSGeo4W64\bin\osg97-osgViewer.dll 3.1.7.97 osg97-osgText.dll C:\OSGeo4W64\bin\osg97-osgText.dll 3.1.7.97 osgEarth.dll C:\OSGeo4W64\bin\osgEarth.dll 0.0.0.0 osg97-osgTerrain.dll C:\OSGeo4W64\bin\osg97-osgTerrain.dll 3.1.7.97 osg97-osgShadow.dll C:\OSGeo4W64\bin\osg97-osgShadow.dll 3.1.7.97 gdal110.dll C:\OSGeo4W64\bin\gdal110.dll 1.10.1.0 osg97-osgManipulator.dll C:\OSGeo4W64\bin\osg97-osgManipulator.dll 3.1.7.97 osgEarthUtil.dll C:\OSGeo4W64\bin\osgEarthUtil.dll 0.0.0.0 osgEarthFeatures.dll C:\OSGeo4W64\bin\osgEarthFeatures.dll 0.0.0.0 osgEarthSymbology.dll C:\OSGeo4W64\bin\osgEarthSymbology.dll 0.0.0.0 osgEarthAnnotation.dll C:\OSGeo4W64\bin\osgEarthAnnotation.dll 0.0.0.0 osg97-osgSim.dll C:\OSGeo4W64\bin\osg97-osgSim.dll 3.1.7.97 osgEarthQt.dll C:\OSGeo4W64\bin\osgEarthQt.dll 0.0.0.0 gpsimporterplugin.dll C:\OSGeo4W64\apps\qgis\plugins\gpsimporterplugin.dll 0.0.0.0 gpxprovider.dll C:\OSGeo4W64\apps\qgis\plugins\gpxprovider.dll 0.0.0.0 grassplugin.dll C:\OSGeo4W64\apps\qgis\plugins\grassplugin.dll 0.0.0.0 qgisgrass.dll C:\OSGeo4W64\apps\qgis\bin\qgisgrass.dll 0.0.0.0 libgrass_gis.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_gis.6.4.3.dll 0.0.0.0 libgrass_datetime.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_datetime.6.4.3.dll 0.0.0.0 libintl-8.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\bin\libintl-8.dll 0.18.2.0 libiconv-2.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\bin\libiconv-2.dll 1.14.0.0 libgrass_vect.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_vect.6.4.3.dll 0.0.0.0 libgrass_dbmibase.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_dbmibase.6.4.3.dll 0.0.0.0 libgrass_dbmiclient.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_dbmiclient.6.4.3.dll 0.0.0.0 libgrass_linkm.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_linkm.6.4.3.dll 0.0.0.0 libgrass_dgl.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_dgl.6.4.3.dll 0.0.0.0 libgrass_rtree.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_rtree.6.4.3.dll 0.0.0.0 libgrass_dig2.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_dig2.6.4.3.dll 0.0.0.0 libgrass_gproj.6.4.3.dll C:\OSGeo4W64\apps\grass\grass-6.4.3\lib\libgrass_gproj.6.4.3.dll 0.0.0.0 grassprovider.dll C:\OSGeo4W64\apps\qgis\plugins\grassprovider.dll 0.0.0.0 grassrasterprovider.dll C:\OSGeo4W64\apps\qgis\plugins\grassrasterprovider.dll 0.0.0.0 heatmapplugin.dll C:\OSGeo4W64\apps\qgis\plugins\heatmapplugin.dll 0.0.0.0 interpolationplugin.dll C:\OSGeo4W64\apps\qgis\plugins\interpolationplugin.dll 0.0.0.0 memoryprovider.dll C:\OSGeo4W64\apps\qgis\plugins\memoryprovider.dll 0.0.0.0 mssqlprovider.dll C:\OSGeo4W64\apps\qgis\plugins\mssqlprovider.dll 0.0.0.0 offlineeditingplugin.dll C:\OSGeo4W64\apps\qgis\plugins\offlineeditingplugin.dll 0.0.0.0 ogrprovider.dll C:\OSGeo4W64\apps\qgis\plugins\ogrprovider.dll 0.0.0.0 ogr_FileGDB.dll C:\OSGeo4W64\bin\gdalplugins\ogr_FileGDB.dll 0.0.0.0 FileGDBAPI.dll C:\OSGeo4W64\bin\FileGDBAPI.dll 1.3.0.143 ogr_OCI.dll C:\OSGeo4W64\bin\gdalplugins\ogr_OCI.dll 0.0.0.0 ogr_SOSI.dll C:\OSGeo4W64\bin\gdalplugins\ogr_SOSI.dll 0.0.0.0 oracleplugin.dll C:\OSGeo4W64\apps\qgis\plugins\oracleplugin.dll 0.0.0.0 oracleprovider.dll C:\OSGeo4W64\apps\qgis\plugins\oracleprovider.dll 0.0.0.0 owsprovider.dll C:\OSGeo4W64\apps\qgis\plugins\owsprovider.dll 0.0.0.0 postgresprovider.dll C:\OSGeo4W64\apps\qgis\plugins\postgresprovider.dll 0.0.0.0 rasterterrainplugin.dll C:\OSGeo4W64\apps\qgis\plugins\rasterterrainplugin.dll 0.0.0.0 roadgraphplugin.dll C:\OSGeo4W64\apps\qgis\plugins\roadgraphplugin.dll 0.0.0.0 qgis_networkanalysis.dll C:\OSGeo4W64\apps\qgis\bin\qgis_networkanalysis.dll 0.0.0.0 spatialiteprovider.dll C:\OSGeo4W64\apps\qgis\plugins\spatialiteprovider.dll 0.0.0.0 spatialqueryplugin.dll C:\OSGeo4W64\apps\qgis\plugins\spatialqueryplugin.dll 0.0.0.0 spitplugin.dll C:\OSGeo4W64\apps\qgis\plugins\spitplugin.dll 0.0.0.0 topolplugin.dll C:\OSGeo4W64\apps\qgis\plugins\topolplugin.dll 0.0.0.0 wcsprovider.dll C:\OSGeo4W64\apps\qgis\plugins\wcsprovider.dll 0.0.0.0 wfsprovider.dll C:\OSGeo4W64\apps\qgis\plugins\wfsprovider.dll 0.0.0.0 wmsprovider.dll C:\OSGeo4W64\apps\qgis\plugins\wmsprovider.dll 0.0.0.0 QtScript4.dll C:\OSGeo4W64\bin\QtScript4.dll 4.8.5.0 zonalstatisticsplugin.dll C:\OSGeo4W64\apps\qgis\plugins\zonalstatisticsplugin.dll 0.0.0.0 qgispython.DLL C:\OSGeo4W64\apps\qgis\bin\qgispython.DLL 0.0.0.0 python27.dll C:\OSGeo4W64\bin\python27.dll 2.7.5150.1013 sip.pyd C:\OSGeo4W64\apps\Python27\Lib\site-packages\sip.pyd 0.0.0.0 QtCore.pyd C:\OSGeo4W64\apps\Python27\Lib\site-packages\PyQt4\QtCore.pyd 0.0.0.0 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[jhemmi]

Replying to silyko:

The version of matplotlib included in the 64-bit installer (matplotlib version 1.3.1) causes python to crash when savefig is applied to save a png. This happens both from the GUI and when applied programatically. Does not happen e.g. for a pdf or jpeg, so seemingly a defect in a (lib)png dependency. Using backend "Qt4Agg".

I've experienced the same problem on Windows but it's OK on Ubuntu & fedora. A workaround is to produce Tiff.