About “symbol lookup error: ..."

[welees]

DAMN IT, There is a old version so file in test path. This problem is not exactly a problem.

Hi all,
I'm trying to build an appimage.
The binaries & libraries are built on my Ubuntu16 and they works well. When I made the appimage, it works well on builder machine(ubuntu16).
But when I try to other platform(Ubuntu20/Kali 2021) it shows "symbol lookup error...". I've checked that the symbol is existed:
/mnt/hgfs/work/Projects/Linux# /tmp/.mount_Visual2ODwL8/usr/bin/vlvmserver: symbol lookup error: /tmp/.mount_Visual2ODwL8/usr/bin/vlvmserver: undefined symbol: _ZTI7CWorker

/proj/appimage# nm usr/bin/libBackendWaiter.so |grep "ZTI7"
0000000000315870 V _ZTI7CThread
0000000000315650 V _ZTI7CWaitor
**0000000000315680 V _ZTI7CWorker**
00000000003148e0 V _ZTI7IObject
0000000000315668 V _ZTI7IWorker
/proj/appimage# nm usr/bin/vlvmserver |grep "ZTI7"
                 U _ZTI7CThread
                 U _ZTI7CWaitor
                 **U _ZTI7CWorker**

When try "myapp.appimage --appimage-extract" & run AppRun. It works well too.
Who can tell me why?
Thanks

[TheAssassin]

You need to provide a lot more information first. What tool are you using to build your bundle? Can you share the result?

[welees]

Hi,
Thanks for quick reply.
The project is a GUI LVM tool. compiler is g++ 5.4. It works well as native app & snap app.

AppImage test result:

root@test-ubuntu:/mnt/hgfs/work/Linux# ./Visual_LVM-x86_64.AppImage start
root@test-ubuntu:/mnt/hgfs/work/Linux# /tmp/.mount_Visual2ODwL8/usr/bin/vlvmserver: symbol lookup error: /tmp/.mount_Visual2ODwL8/usr/bin/vlvmserver: undefined symbol: _ZTI7CWorker

AppImage extract test result:

root@test-ubuntu:/mnt/hgfs/work/Linux# ./Visual_LVM-x86_64.AppImage --appimage-extract
squashfs-root/.AppRun.swp
squashfs-root/.DirIcon
WARNING: could not create symlink
squashfs-root/AppRun
squashfs-root/share
squashfs-root/usr
squashfs-root/usr/bin
squashfs-root/usr/bin/libBackendWaiter.so
squashfs-root/usr/bin/nm
squashfs-root/usr/bin/run_browser.sh
squashfs-root/usr/bin/vlvmconsole
squashfs-root/usr/bin/vlvmserver
squashfs-root/usr/lib
squashfs-root/usr/lib/libBackendWaiter.so
squashfs-root/usr/lib/libbfd-2.26.1-system.so
squashfs-root/usr/share
squashfs-root/usr/share/LICENSE.txt
squashfs-root/usr/share/applications
squashfs-root/usr/share/applications/visual-lvm-remote.desktop
squashfs-root/usr/share/applications/visual-lvm-remote.png
squashfs-root/usr/share/config.ini
squashfs-root/visual-lvm-remote.desktop
squashfs-root/visual-lvm-remote.png
root@test-ubuntu:/mnt/hgfs/work/Linux# cd squashfs-root/
root@test-ubuntu:/mnt/hgfs/work/Linux/squashfs-root# ./AppRun
1 /mnt/hgfs/work/Linux/squashfs-root/usr/lib:/mnt/hgfs/work/Projects/VisualLVMMK4/Linux/squashfs-root/usr/bin 2
3 Visual LVM Remote for AppImage MAJOR ModMINOR StepREVISION
  Unknown parameter. please try
     visual-lvm-remote.AppImage help
  for help information
root@test-ubuntu:/mnt/hgfs/work/Linux/squashfs-root# ./AppRun start
1 /mnt/hgfs/work/Linux/squashfs-root/usr/lib:/mnt/hgfs/work/Projects/VisualLVMMK4/Linux/squashfs-root/usr/bin 2
3 Visual LVM Remote for AppImage MAJOR ModMINOR StepREVISION
  Start service ...
root@test-ubuntu:/mnt/hgfs/work/Linux/squashfs-root# Visual LVM Remote MKV Mod6 build at Apr 27 2025 21:27:41

---------------------------------------
WeLees Server on port 8341
---------------------------------------

[welees]

DAMN IT, There is a old version so file in test path. This problem is not exactly a problem. Thank you

[probonopd]

Also, running LD_DEBUG=LIBS ./Your.AppImage might give some insights.

[welees]

root@welees-builder:/mnt/hgfs/work/Linux# LD_DEBUG=LIBS ./Visual_LVM-x86_64.AppImage start
warning: debug option `LIBS' unknown; try LD_DEBUG=help
warning: debug option `LIBS' unknown; try LD_DEBUG=help
warning: debug option `LIBS' unknown; try LD_DEBUG=help
warning: debug option `LIBS' unknown; try LD_DEBUG=help
1 /tmp/.mount_VisualXJSFh2/usr/lib:/tmp/.mount_VisualXJSFh2/usr/bin 2
3 Visual LVM Remote for AppImage MAJOR ModMINOR StepREVISION
  Start service ...
root@welees-builder:/mnt/hgfs/work/Linux# warning: debug option `LIBS' unknown; try LD_DEBUG=help
/tmp/.mount_VisualXJSFh2/usr/bin/vlvmserver: symbol lookup error: /tmp/.mount_VisualXJSFh2/usr/bin/vlvmserver: undefined symbol: _ZTI7CWorker

[welees]

DAMN IT, There is a old version so file in test path. This problem is not exactly a problem. Thank you

[welees]

The AppRun:

#!/bin/bash

startService()
{
        echo "  Start service ..."
        exec $RUN_PATH/vlvmserver config_path=$CUR_PATH/.visual-lvm-remote scenario=appimage &
}

stopService()
{
        process=`ps -ef|grep "vlvmserver config_path"|sed '/grep/d'|awk '{print $2}'`
        if [ "$process" != "" ]; then
                echo -n "  Stop service ..."
                kill $process > /dev/null
                echo " Done"
        else
                echo "  Visual LVM service is not run"
        fi
}

major=MAJOR
minor=MINOR
rev=REVISION
HERE=$(dirname $(readlink -f $0))
if [ "$LD_LIBRARY_PATH" == "" ]; then
        export LD_LIBRARY_PATH=$HERE/usr/lib:$HERE/usr/bin
else
        export LD_LIBRARY_PATH=$HERE/usr/lib:$LD_LIBRARY_PATH
fi
echo Visual LVM Remote for AppImage $major Mod$minor Step$rev
RUN_PATH=$HERE/usr/bin

if [ ! -d "$CUR_PATH/.visual-lvm-remote" ]; then
        echo ""
        echo "  First time running, please do some initializing work ..."
        mkdir $CUR_PATH/.visual-lvm-remote
        cp $HERE/usr/share/config.ini $CUR_PATH/.visual-lvm-remote

        port=""
        while [ "$port" = "" ]
        do
                read -p "Specify work port : [8341]" port
                if [ "$port" = "" ]; then
                        port=8341
                fi
                port=`grep '^[[:digit:]]*$' <<< $port`
        done
fi

case "$1" in
        start)
                startService
                ;;
        stop)
                stopService
                ;;
        restart)
                stopService
                startService
                ;;
        change-port)
                echo "  Start Visual LVM Remote $major Mod$minor console ..."
                $RUN_PATH/vlvmconsole -chgport port=$2 config_path=$CUR_PATH/.visual-lvm-remote
                stopService
                startService
                ;;
        change-password)
                echo "  Start Visual LVM Remote $major Mod$minor console ..."
                $RUN_PATH/vlvmconsole -chgpass config_path=$CUR_PATH/.visual-lvm-remote
                stopService
                startService
                ;;
        license)
                cat $HERE/usr/share/LICENSE.txt
                ;;
        help)
                echo "  visual-lvm-remote.AppImage starti|stop|restart|change-port port|change-passwordi|license|help"
                echo "    start            To run Visual LVM"
                echo ""
                echo "    stop             To stop Visual LVM"
                echo ""
                echo "    restart          To restart Visual LVM"
                echo ""
                echo "    change-port      To change the port which bind to Visual LVM service"
                echo ""
                echo "    change-password  To change Visual LVM login password"
                echo ""
                echo "    lincnse          To shoe license"
                echo ""
                echo "    help             To shoe help message"
                echo ""
                ;;
        *)
                echo "  Unknown parameter. please try"
                echo "     visual-lvm-remote.AppImage help"
                echo "  for help information"
                ;;
esac

[welees]

Could I upload the AppImage for debugging?

[probonopd]

Yes, please upload it somewhere, then share the link here. Thanks!

[welees]

I handled it, there is an old lib in my test path. Thank you