[Gambas-bugtracker] Bug #2226: Data Breakpoint not correct - and causes Segfault

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.2226&from=L21haW4-

John ANDERSON reported a new bug.

Summary
-------

Data Breakpoint not correct - and causes Segfault

Type             : Bug
Priority         : High
Gambas version   : 3.16
Product          : Development Environment


Description
-----------

Gambas3 3.16.90 May 27, 2021 on LM 20.1

Project an sys info included.

This is very repeatable at my end

Screenshots included. (Well, they were attached until  mailing list got scared of total message size of 700kb ...OK, I took rest of screen shots out.).

Step 1 - after first "x=0" executed -  At regular Breakpoint, we watch expression x for a change. x is zero at this point.  Expression selected in debugger window and eyeball clicked...This could use a pop-up tool tip helper maybe?

Hit F5 to run.

Step 2 - We hit first "x=0" - Break should NOT happen here, because no change in x.  Hit F5 to continue

Step 3 -  (Stops at one line below step 2) Break should not happen here, no change in x.  Hit F5 to continue

Step 4 and Step 5 seem OK - works as expected.  Execution runs where it should, breaks when it should when x changes, and when x stays same.  That is how Data Breakpoint it should work.

Program finishes.

Now I try to run program again and Step 6 - CRASH... Segfault.  I restart the machine and try again - first run of program runs (with sorta wrong data breakpoints), second run crashes.

Is this me being stupid again or ??

No segfaults if I don't try to use Data Breakpoint feature.

-John


System information
------------------

[System]
Gambas=3.16.90
OperatingSystem=Linux
Kernel=5.4.0-73-generic
Architecture=x86_64
Distribution=Linux Mint 20.1 Ulyssa
Desktop=CINNAMON
Font=Ubuntu,10
Scale=7
Theme=mint-y-aqua
Language=en_US.UTF-8
Memory=7868M

[Libraries]
Cairo=libcairo.so.2.11600.0
Curl=libcurl.so.4.6.0
DBus=libdbus-1.so.3.19.11
GDK2=libgdk-x11-2.0.so.0.2400.32
GDK3=libgdk-3.so.0.2404.16
GStreamer=libgstreamer-1.0.so.0.1602.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2404.16
OpenGL=libGL.so.1.7.0
Poppler=libpoppler.so.97.0.0
QT5=libQt5Core.so.5.12.8
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DEFAULTS_PATH=/usr/share/gconf/cinnamon.default.path
DESKTOP_SESSION=cinnamon
DISPLAY=:0
GB_GUI=gb.gtk3
GDMSESSION=cinnamon
GDM_LANG=en_US
GENICAM_CLPROTOCOL=/opt/matrox_imaging/mil/../drivers/genicam/v3_2/bin/
GENICAM_MAJOR=3
GENICAM_MINOR=2
GIO_LAUNCHED_DESKTOP_FILE=<home>/Desktop/gambas3.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=3213
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK3_MODULES=xapp-gtk3-module
GTK_MODULES=gail:atk-bridge
GTK_OVERLAY_SCROLLING=1
HOME=<home>
INSIDE_NEMO_PYTHON=
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_ALL=en_US.UTF-8
LOGNAME=<user>
MANDATORY_PATH=/usr/share/gconf/cinnamon.mandatory.path
MILDIR=/opt/matrox_imaging/mil
MIL_GENICAM_PATH=/opt/matrox_imaging/mil/../drivers/genicam
MIL_XML_REPOSITORY=/opt/matrox_imaging/mil/../drivers/genicam/v3_2/xml/GenApi
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/opt/matrox_imaging/mil/../tools
PWD=<home>
QT_ACCESSIBILITY=1
QT_LOGGING_RULES=*.debug=false
QT_QPA_PLATFORMTHEME=qt5ct
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/1125,unix/<hostname>:/tmp/.ICE-unix/1125
SHELL=/bin/bash
SHLVL=0
SSH_AGENT_PID=1223
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
TEMP=/tmp
TZ=:/etc/localtime
USER=<user>
XAUTHORITY=<home>/.Xauthority
XDG_CONFIG_DIRS=/etc/xdg/xdg-cinnamon:/etc/xdg
XDG_CURRENT_DESKTOP=X-Cinnamon
XDG_DATA_DIRS=/usr/share/cinnamon:/usr/share/gnome:<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=cinnamon
XDG_SESSION_ID=c1
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
XDG_SESSION_TYPE=x11
XDG_VTNR=7