QGIS » QGIS Application

The culprit is the layer:

<maplayer minimumScale="0" maximumScale="1e+08" geometry="Polygon" 
type="vector" hasScaleBasedVisibilityFlag="0">
            <id>pippo20130124131158937</id>
            <datasource>../Gis_AdB/Rischio_alluvione/mappe/pippo/1_polygon</datasource>
            <title></title>
            <abstract></abstract>
            <layername>pippo</layername>
            <srs>
                <spatialrefsys>
                    <proj4>+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996
+x_0=1500000 +y_0=0 +ellps=intl
+towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 +units=m
+no_defs</proj4>
                    <srsid>968</srsid>
                    <srid>3003</srid>
                    <authid>EPSG:3003</authid>
                    <description>Monte Mario / Italy zone 1</description>
                    <projectionacronym>tmerc</projectionacronym>
                    <ellipsoidacronym>intl</ellipsoidacronym>
                    <geographicflag>false</geographicflag>
                </spatialrefsys>
            </srs>
            <transparencyLevelInt>255</transparencyLevelInt>
            <provider encoding="System">grass</provider>
            <vectorjoins/>
            <renderer-v2 symbollevels="0" type="singleSymbol">
                <symbols>
                    <symbol outputUnit="MM" alpha="1" type="fill" name="0">
                        <layer pass="0" class="SimpleFill" locked="0">
                            <prop k="color" v="157,62,79,255"/>
                            <prop k="color_border" v="0,0,0,255"/>
                            <prop k="offset" v="0,0"/>
                            <prop k="style" v="solid"/>
                            <prop k="style_border" v="solid"/>
                            <prop k="width_border" v="0.26"/>
                        </layer>
                    </symbol>
                </symbols>
                <rotation field=""/>
                <sizescale field="" scalemethod="area"/>
            </renderer-v2>
            <customproperties/>
            <displayfield>id</displayfield>
            <label>0</label>
            <labelattributes>
                <label fieldname="" text="Etichetta"/>
                <family fieldname="" name="MS Shell Dlg 2"/>
                <size fieldname="" units="pt" value="12"/>
                <bold fieldname="" on="0"/>
                <italic fieldname="" on="0"/>
                <underline fieldname="" on="0"/>
                <strikeout fieldname="" on="0"/>
                <color fieldname="" red="0" blue="0" green="0"/>
                <x fieldname=""/>
                <y fieldname=""/>
                <offset x="0" y="0" units="pt" yfieldname="" xfieldname=""/>
                <angle fieldname="" value="0" auto="0"/>
                <alignment fieldname="" value="center"/>
                <buffercolor fieldname="" red="255" blue="255" green="255"/>
                <buffersize fieldname="" units="pt" value="1"/>
                <bufferenabled fieldname="" on=""/>
                <multilineenabled fieldname="" on=""/>
                <selectedonly on=""/>
            </labelattributes>
            <editform>.</editform>
            <editforminit></editforminit>
            <annotationform>.</annotationform>
            <editorlayout>generatedlayout</editorlayout>
            <excludeAttributesWMS/>
            <excludeAttributesWFS/>
            <attributeactions/>
        </maplayer>

Still confirmed here
removing the layer as suggested by Paolo the prj is loaded properly !

Stacktrace:

Program received signal SIGSEGV, Segmentation fault.
0x00007fffd73f5539 in QgsGrassProvider::closeLayer (layerId=-1)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/providers/grass/qgsgrassprovider.cpp:680
680      QgsDebugMsg( QString( "Close layer %1 nUsers = %2" ).arg( layerId ).arg( mLayers[layerId].nUsers ) );
(gdb) bt full
#0  0x00007fffd73f5539 in QgsGrassProvider::closeLayer (layerId=-1)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/providers/grass/qgsgrassprovider.cpp:680
        __FUNCTION__ = "closeLayer" 
#1  0x00007fffd73f2472 in QgsGrassProvider::~QgsGrassProvider (this=0x5bdf6c0, 
    __in_chrg=<optimized out>)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/providers/grass/qgsgrassprovider.cpp:267
No locals.
#2  0x00007fffd73f25ee in QgsGrassProvider::~QgsGrassProvider (this=0x5bdf6c0, 
    __in_chrg=<optimized out>)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/providers/grass/qgsgrassprovider.cpp:268
No locals.
#3  0x00007ffff4a64376 in QgsVectorLayer::~QgsVectorLayer (this=0x5bdb6c0, 
    __in_chrg=<optimized out>)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/core/qgsvectorlayer.cpp:195
        overlayIt = {i = 0x7fffffffb1b0}
#4  0x00007ffff4a649b8 in QgsVectorLayer::~QgsVectorLayer (this=0x5bdb6c0, 
    __in_chrg=<optimized out>)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/core/qgsvectorlayer.cpp:213
No locals.
#5  0x00007ffff4a18656 in QgsProject::addLayer (this=0x123fa80, layerElem=..., brokenNodes=..., 
    vectorLayerList=...) at /home/sam/pacchetti_gis/Quantum-GIS/src/core/qgsproject.cpp:767
        type = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 56639}, 
            alloc = 0, size = 0, data = 0xe0749a, clean = 0, simpletext = 0, righttoleft = 0, 
---Type <return> to continue, or q <return> to quit---
            asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {
            ref = {_q_value = 1099}, alloc = 0, size = 0, data = 0x7ffff38368da, clean = 0, 
            simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {
              0}}, d = 0x579f230, static codecForCStrings = 0x0}
        __FUNCTION__ = "addLayer" 
        mapLayer = 0x5bdb6c0
#6  0x00007ffff4a17d67 in QgsProject::_getMapLayers (this=0x123fa80, doc=...)
    at /home/sam/pacchetti_gis/Quantum-GIS/src/core/qgsproject.cpp:699
        node = {impl = 0x579f3e0}
        element = {<QDomNode> = {impl = 0x579f3e0}, <No data fields>}
        name = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 56639}, 
            alloc = 0, size = 0, data = 0xe0749a, clean = 0, simpletext = 0, righttoleft = 0, 
            asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {
            ref = {_q_value = 1099}, alloc = 0, size = 0, data = 0x7ffff38368da, clean = 0, 
            simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {
              0}}, d = 0x5bdd750, static codecForCStrings = 0x0}
        i = 19
        nl = {impl = 0x53fcf90}
        wk = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 56639}, 
            alloc = 0, size = 0, data = 0xe0749a, clean = 0, simpletext = 0, righttoleft = 0, 
            asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {
            ref = {_q_value = 1099}, alloc = 0, size = 0, data = 0x7ffff38368da, clean = 0, 
            simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {