[Qgis-user] [Qgis-developer] QGIS crashes when zzoming in

[Jonathan Webb]

Hi,
I'm that somebody.

Given that the unstable project worked on Windows 7 OK but that a fresh 
project with all plugins uninstalled became unstable, should I be 
creating a bug report?  I am in no way a developer, so unsure about 
protocol etc.

latest GDB report is this, after Mathias Kuhn advised to type "bt" after 
crash.  I ran the command, QGIS opened, I picked the project , panned & 
it became unresponsive & I enetered "bt"thus:

jonathan at GIS ~ $ gdb -ex=r --args /usr/bin/qgis.bin
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/qgis.bin...(no debugging symbols 
found)...done.
Starting program: /usr/bin/qgis.bin
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Warning: loading of qgis translation failed 
[/usr/share/qgis/i18n//qgis_en_GB]
Warning: loading of qt translation failed 
[/usr/share/qt4/translations/qt_en_GB]
[New Thread 0x7fffcd875700 (LWP 29425)]
[New Thread 0x7fffc7fff700 (LWP 29426)]
[New Thread 0x7fffc75cf700 (LWP 29427)]
[New Thread 0x7fffc6dce700 (LWP 29428)]
Warning: QCss::Parser - Failed to load file  "/style.qss"
QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No 
such file or directory
[New Thread 0x7fffc65cd700 (LWP 29430)]
Warning: QFileSystemWatcher: failed to add paths: 
/home/jonathan/.qgis2//project_templates
[New Thread 0x7fffc5dcc700 (LWP 29431)]
[New Thread 0x7fffc55cb700 (LWP 29432)]
Warning: QLayout: Attempting to add QLayout "" to QgsPanelWidgetStack 
"mWidgetStack", which already has a layout
[New Thread 0x7fff5ea4e700 (LWP 29450)]
[New Thread 0x7fff5e24d700 (LWP 29458)]
[New Thread 0x7fff5da4c700 (LWP 29459)]
[New Thread 0x7fff5d24b700 (LWP 29460)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff5e24d700 (LWP 29458)]
0x00007ffff629c81d in 
QgsExpressionContextScope::~QgsExpressionContextScope()
     () from /usr/lib/libqgis_core.so.2.18.4
(gdb) bt
#0  0x00007ffff629c81d in 
QgsExpressionContextScope::~QgsExpressionContextScope() () from 
/usr/lib/libqgis_core.so.2.18.4
#1  0x00007ffff61621f2 in 
QgsSymbolV2RenderContext::~QgsSymbolV2RenderContext()
     () from /usr/lib/libqgis_core.so.2.18.4
#2  0x00007ffff616540b in QgsSymbolV2::startRender(QgsRenderContext&, 
QgsFields const*) () from /usr/lib/libqgis_core.so.2.18.4
#3  0x00007ffff609bb2c in 
QgsCategorizedSymbolRendererV2::startRender(QgsRenderContext&, QgsFields 
const&) () from /usr/lib/libqgis_core.so.2.18.4
#4  0x00007ffff6450e2a in ?? () from /usr/lib/libqgis_core.so.2.18.4
#5  0x00007ffff631a4f7 in 
QgsMapRendererParallelJob::renderLayerStatic(LayerRenderJob&) () from 
/usr/lib/libqgis_core.so.2.18.4
#6  0x00007ffff631b7e0 in ?? () from /usr/lib/libqgis_core.so.2.18.4
#7  0x00007ffff631b837 in ?? () from /usr/lib/libqgis_core.so.2.18.4
#8  0x00007ffff631bc1d in ?? () from /usr/lib/libqgis_core.so.2.18.4
#9  0x00007ffff5a93005 in QtConcurrent::ThreadEngineBase::run() ()
    from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007ffff5a94fee in ?? () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007ffff5aa132f in ?? () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007fffee1e8184 in start_thread (arg=0x7fff5e24d700)
     at pthread_create.c:312
#13 0x00007ffff458e37d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111




Jonathan Webb
Freelance GIS Specialist
07941 921905
http://www.jwebbgis.co.uk
http://uk.linkedin.com/in/jwebbgis
On 23/03/17 12:56, Richard Duivenvoorde wrote:
> On 23-03-17 13:27, Paolo Cavallini wrote:
>> Hi all,
>> I'm consistently getting a crash when zooming in, both with qgis 2.14.11
>> and with 2.18.4, with a particular project. It does not happen with
>> others. When loading layers individually, it also does not crash.
>> Apparently therefore the issue is related to styling.
>> The same project was working well prieviously.
>> Anyone has similar issues?
> Yesterday, there was somebody too on the userlist:
>
> https://lists.osgeo.org/pipermail/qgis-user/2017-March/039520.html
>
> I asked him to sent a project+data to be able to reproduce, he responded
> to me privately, that the same project on other machines worked, and
> recreating the project also did.
>
> Which makes yours a valid conclusion: something in the project crashes...
> But only to be tested by either providing project+data+steps I think.
> Or maybe providing a gdb stacktrace?
>
> Richard
>
>

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