...
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff747f7700 (LWP 30419)]
0x00007fffe77596cb in my_stat () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
(gdb) bt
#0  0x00007fffe77596cb in my_stat () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
#1  0x00007fffe775277c in ?? () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
#2  0x00007fffe77532e0 in ?? () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
#3  0x00007fffe7753681 in my_search_option_files () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
#4  0x00007fffe775391b in my_load_defaults () from /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18
#5  0x00007ffff4d1f704 in ?? () from /usr/lib/libgdal.so.1
#6  0x00007ffff4d20e72 in ?? () from /usr/lib/libgdal.so.1
#7  0x00007ffff4d795db in OGRSFDriverRegistrar::Open(char const*, int, OGRSFDriver**) ()
   from /usr/lib/libgdal.so.1
#8  0x00007fff8593bad0 in QgsOgrFeatureIterator::QgsOgrFeatureIterator(QgsOgrFeatureSource*, bool, QgsFeatureRequest const&) () from /usr/lib/qgis/plugins/libogrprovider.so
#9  0x00007fff8593c050 in QgsOgrFeatureSource::getFeatures(QgsFeatureRequest const&) ()
   from /usr/lib/qgis/plugins/libogrprovider.so
#10 0x00007ffff41b6774 in QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator(QgsVectorLayerFeatureSource*, bool, QgsFeatureRequest const&) () from /usr/lib/libqgis_core.so.2.8.3
#11 0x00007ffff41b6c30 in QgsVectorLayerFeatureSource::getFeatures(QgsFeatureRequest const&) ()
   from /usr/lib/libqgis_core.so.2.8.3
#12 0x00007ffff41c1c8b in QgsVectorLayerRenderer::render() () from /usr/lib/libqgis_core.so.2.8.3
#13 0x00007ffff40d66ba in QgsMapRendererCustomPainterJob::doRender() () from /usr/lib/libqgis_core.so.2.8.3
#14 0x00007ffff40d6739 in QgsMapRendererCustomPainterJob::staticRender(QgsMapRendererCustomPainterJob*) ()
   from /usr/lib/libqgis_core.so.2.8.3
#15 0x000000000081e1b5 in QtConcurrent::RunFunctionTask<void>::run() ()
#16 0x00007ffff2b1cb80 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007ffff2b2970f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007fffef30e0a4 in start_thread (arg=0x7fff747f7700) at pthread_create.c:309
#19 0x00007fffef60904d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111