Segmentation Error On QSqlDriver::AddDatabase

MoekieBoekie

Goodday,

I get an segmenation fault when loading the QMysql-driver with the line:

QSqlDatabase::addDatabase("QMYSQL" , "connection");

(sidenote, QSqlDatabase::addDatabase("QSQLITE","connection"); work as expected without seg-fault)

Now the next list of points should already be a trigger that I am doing something 'special' and weird. But I hope anyway that someone can help me :)

Due to legacy software I had to build Qt5 under special conditions

I am building my env in a (docker) container
I am using the Qt5 source v5.15.2
I am building with OpenSSL 1.1.1v (linking against is explicitly)
-- Also buid from sources
I am building mariadb, linked against openssl 1.1.1v as well.

I am kicking of the configuration as follows:

MYSQL_PREFIX='/usr' OPENSSL_LIBS='-L/usr/lib64 -lssl -lcrypto' ./configure -opensource -confirm-license -debug -v \
               -prefix /usr \
               -plugin-sql-mysql \
               -sql-mysql \
               -openssl-linked -no-securetransport -no-schannel \
               -make libs \
               -nomake tools \
               -nomake examples \
               -nomake tests \
               -no-opengl \
               -no-gui \
               -skip qt3d \
               -skip qtandroidextras \
               -skip qtcanvas3d \
               -skip qtcharts \
               -skip qtconnectivity \
               -skip qtdatavis3d \
               -skip qtdeclarative \
               -skip qtdoc \
               -skip qtgamepad \
               -skip qtgraphicaleffects \
               -skip qtimageformats \
               -skip qtlocation \
               -skip qtmacextras \
               -skip qtmultimedia \
               -skip qtnetworkauth \
               -skip qtpurchasing \
               -skip qtquickcontrols \
               -skip qtquickcontrols2 \
               -skip qtscript \
               -skip qtscxml \
               -skip qtsensors \
               -skip qtserialbus \
               -skip qtserialport \
               -skip qtspeech \
               -skip qtsvg \
               -skip qttools \
               -skip qttranslations \
               -skip qtvirtualkeyboard \
               -skip qtwayland \
               -skip qtwebchannel \
               -skip qtwebengine \
               -skip qtwebsockets \
               -skip qtwebview \
               -skip qtwinextras \
               -skip qtx11extras \
               -skip qtxmlpatterns \
               -no-feature-texthtmlparser \
               -no-feature-textodfwriter \
               -no-feature-concurrent \
               -no-feature-effects \
               -no-feature-sharedmemory \
               -no-feature-systemsemaphore \
               -no-feature-im \
               -no-feature-process \
               -no-feature-dom \
               -no-feature-filesystemmodel \
               -no-feature-filesystemwatcher \
               -no-feature-graphicsview \
               -no-feature-graphicseffect \
               -no-feature-sizegrip \
               -no-feature-calendarwidget \
               -no-feature-printpreviewwidget \
               -no-feature-keysequenceedit \
               -no-feature-colordialog \
               -no-feature-filedialog \
               -no-feature-fontdialog \
               -no-feature-printpreviewdialog \
               -no-feature-progressdialog \
               -no-feature-inputdialog \
               -no-feature-errormessage \
               -no-feature-wizard \
               -no-feature-datawidgetmapper \
               -no-feature-imageformat_bmp \
               -no-feature-imageformat_ppm \
               -no-feature-imageformat_xbm \
               -no-feature-imageformat_png \
               -no-feature-imageformat_jpeg \
               -no-feature-image_heuristic_mask \
               -no-feature-image_text \
               -no-feature-colornames \
               -no-feature-cups \
               -no-feature-translation \
               -no-feature-codecs \
               -no-feature-big_codecs \
               -no-feature-iconv \
               -no-feature-ftp \
               -no-feature-udpsocket \
               -no-feature-networkproxy \
               -no-feature-socks5 \
               -no-feature-networkdiskcache \
               -no-feature-bearermanagement \
               -no-feature-completer \
               -no-feature-fscompleter \
               -no-feature-desktopservices \
               -no-feature-mimetype \
               -no-feature-systemtrayicon \
               -no-feature-undocommand \
               -no-feature-undostack \
               -no-feature-undogroup \
               -no-feature-undoview \
               -no-feature-statemachine \
               -no-feature-gestures \
               -no-feature-dbus

The build succeeds and I am able to find all the drivers at runtime when I am setting the environment variable QT_PLUGIN_PATH

The stack trace on the segmentation fault I get is as follows:

__strcmp_avx2 0x00007ffff6ba8467
lh_insert 0x00007ffff79d0489
OBJ_NAME_add 0x00007ffff794f3bb
ossl_init_ssl_base_ossl_ 0x00007ffff69d78e1
__pthread_once_slow pthread_once.c:116
CRYPTO_THREAD_run_once 0x00007ffff68ac999
OPENSSL_init_ssl 0x00007ffff69d7aa3
ma_tls_start openssl.c:221
mysql_once_init mariadb_lib.c:4334
mysql_once_init mariadb_lib.c:4289
__pthread_once_slow pthread_once.c:116
___pthread_once pthread_once.c:143
mysql_server_init mariadb_lib.c:4365
qLibraryInit qsql_mysql.cpp:1100
QMYSQLDriver::QMYSQLDriver qsql_mysql.cpp:1130
QMYSQLDriverPlugin::create main.cpp:67
qLoadPlugin<…> qfactoryloader_p.h:108
QSqlDatabasePrivate::init qsqldatabase.cpp:699
QSqlDatabase::QSqlDatabase qsqldatabase.cpp:635
QSqlDatabase::addDatabase qsqldatabase.cpp:472
main servicemain.cpp:192
__libc_start_call_main libc_start_call_main.h:58
__libc_start_main_impl libc-start.c:360
_start 0x0000000000430211

Does anyone see/ recognise something wrong ?

hskoglund

Hi, just guessing but you're using Ubuntu 18.04.6 or Ubuntu 20.04.6 try upgrading to Ubuntu 22.04.3.

MoekieBoekie

@hskoglund
Sorry, the docker base container is debian: stable-slim

Christian Ehrlicher

@MoekieBoekie said in Segmentation Error On QSqlDriver::AddDatabase:

__strcmp_avx2

Does your virtualization support AVX2?

MoekieBoekie

@Christian-Ehrlicher

Yeah, this seemed to be the problem...
Took much longer to than I want to admit before I found it...

I wanted to post my fix already, but newbies on the forum can only post every 10 minutes 😅