[QGIS-Developer] QGIS Debug build fails to launch in QtCreator

[Nyall Dawson]

On Fri, 4 Sep 2020 at 09:43, Tim Sutton <tim at kartoza.com> wrote:
>
> Sorry my second message on this thread was probably a red herring - if I run as sudo QGIS starts fine....

Grab this fix: https://github.com/qgis/QGIS/pull/38593

Nyall

>
> Regards
>
> Tim
>
> On Thu, Sep 3, 2020 at 11:48 PM Tim Sutton <tim at kartoza.com> wrote:
>>
>> Hi
>>
>> By the way poking around with it a bit more it seems to be crashing on this line @Nyal:
>>
>> 39fbc2ac331 src/core/qgsproject.cpp (Nyall Dawson               2020-08-31 10:30:20 +1000)   mMainAnnotationLayer->setTransformContext( context );
>>
>> Regards
>>
>> Tim
>>
>>
>> On Thu, Sep 3, 2020 at 10:02 PM Tim Sutton <tim at kartoza.com> wrote:
>>>
>>> Dear QGIS Developers
>>>
>>> I am trying to run QGIS in debug mode in Qt-Creator. When I launch the QGIS executable from QtCreator, I can see the application starting up but then after a short time it crashes out. This happens both when I press the green 'Run' triangle icon and when I press the green 'Start Debugging of Target Project' triangle icon.
>>>
>>> I am building on pop_os! (essentially Ubuntu 20.04, 64 bit) using GCC without CCache and I have CMAKE_BUILD_TYPE set to Debug.
>>>
>>> After starting QGIS it thinks for a while and then dies with the following (full log of messages here [1]).
>>>
>>> 21:21:14: Debugging starts
>>> src/app/main.cpp:505 : (main) [0ms] Starting qgis main
>>> src/core/qgsmessagelog.cpp:29 : (logMessage) [379ms] 2020-09-03T21:21:45 [1] Successfully loaded globalsettingsfile path: /home/timlinux/dev/cpp/QGIS-Debug-Build/output/data/resources/qgis_global_settings.ini
>>> src/core/qgscolorramp.cpp:732 : (loadFile) [103ms] filename= /home/timlinux/dev/cpp/QGIS-Debug-Build/output/data/resources/cpt-city-qgis-min/grass/elevation.svg loaded=0
>>> QGIS died on signal 11Could not attach to process.  If your uid matches the uid of the target
>>> process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
>>> again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
>>> warning: process 223467 is already traced by process 223447
>>> ptrace: Operation not permitted.
>>> No thread selected
>>> No stack.
>>> gdb returned 256
>>> 21:30:39: Debugging has finished
>>>
>>>
>>>
>>> When I googled the ptrace error message above I found this StackOverflow post[2] which seems to address the same issue. However, even after trying all the various hints listed there, I still have the crash whenever I try to launch QGIS in debug mode, or outside of a debugger.
>>>
>>> Has anyone else experienced this? Can you help me fix it?
>>>
>>> Many thanks!
>>>
>>> Regards
>>>
>>> Tim
>>>
>>>
>>> [1] https://gist.github.com/timlinux/ac7468675e08f18428e3fe60d7e9633c
>>> [2]https://stackoverflow.com/questions/22120711/qt-creator-ptrace-operation-not-permitted-what-is-the-permanent-solution/30486572
>>>
>>>
>>>
>>> --
>>> ------------------------------------------------------------------------------------------
>>>
>>> Tim Sutton
>>> Visit http://kartoza.com to find out about open source:
>>>  * Desktop GIS programming services
>>>  * Geospatial web development
>>> * GIS Training
>>> * Consulting Services
>>> Skype: timlinux Irc: timlinux on #qgis at freenode.net
>>> Tim is a member of the QGIS Project Steering Committee
>>> -------------------------------------------------------------------------------------------
>>> Kartoza is a merger between Linfiniti and Afrispatial
>>
>>
>>
>> --
>> ------------------------------------------------------------------------------------------
>>
>> Tim Sutton
>> Visit http://kartoza.com to find out about open source:
>>  * Desktop GIS programming services
>>  * Geospatial web development
>> * GIS Training
>> * Consulting Services
>> Skype: timlinux Irc: timlinux on #qgis at freenode.net
>> Tim is a member of the QGIS Project Steering Committee
>> -------------------------------------------------------------------------------------------
>> Kartoza is a merger between Linfiniti and Afrispatial
>
>
>
> --
> ------------------------------------------------------------------------------------------
>
> Tim Sutton
> Visit http://kartoza.com to find out about open source:
>  * Desktop GIS programming services
>  * Geospatial web development
> * GIS Training
> * Consulting Services
> Skype: timlinux Irc: timlinux on #qgis at freenode.net
> Tim is a member of the QGIS Project Steering Committee
> -------------------------------------------------------------------------------------------
> Kartoza is a merger between Linfiniti and Afrispatial
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