[oe] QT5 application NOT generating core dump upon receiving segmentation fault

[Ankur Tyagi]

Hi Julien,

I am getting core dumps after exporting QT_QPA_ENABLE_TERMINAL_KEYBOARD=1

Many thanks for your help.

After going through void qt_signal_handler(int sig), I also noticed that if
I don't export QT_QPA_ENABLE_TERMINAL_KEYBOARD but export
QT_CRASH_OUTPUT=/home/coredump.log , then also there is no core dump in
/home/coredump.log
What else am I missing here ?​


regards
Ankur

"Knowledge is knowing tomato is a fruit, wisdom is not putting it in a
fruit salad"

On Wed, Dec 16, 2015 at 12:25 AM, Julien Brianceau (jbriance) <
jbriance at cisco.com> wrote:

> Just to be sure, can you try the following export before launching your Qt
> app on your target:
>
>     export QT_QPA_ENABLE_TERMINAL_KEYBOARD=1
>
> It could workaround the signal handler installation, cf.
> http://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/fbconvenience/qfbvthandler.cpp?h=5.4#n71
>
> Julien
>
> -----Original Message-----
> From: openembedded-devel-bounces at lists.openembedded.org [mailto:
> openembedded-devel-bounces at lists.openembedded.org] On Behalf Of Ankur
> Tyagi
> Sent: mardi 15 décembre 2015 12:06
> To: openembedded-devel at lists.openembedded.org
> Subject: Re: [oe] QT5 application NOT generating core dump upon receiving
> segmentation fault
>
> Hi,
>
> I am using Qt5.4.1 with eglfs QPA.
>
> Is there a way to avoid qt signal handler during compilation ? I would like
> avoid patching Qt code.
>
> Thanks
> Ankur
> On 16-Dec-2015 12:00 am, "Julien Brianceau (jbriance)" <jbriance at cisco.com
> >
> wrote:
>
> > Hi,
> >
> > What exact version of Qt5 and which Qt QPA platform do you use with your
> > kit ?
> >
> > A quick grep shows this:
> >
> http://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/kernel/qcrashhandler.cpp?h=5.5#n409
> ,
> > it could explain your issue if it is called.
> >
> > Julien
> >
> > -----Original Message-----
> > From: openembedded-devel-bounces at lists.openembedded.org [mailto:
> > openembedded-devel-bounces at lists.openembedded.org] On Behalf Of Ankur
> > Tyagi
> > Sent: mardi 15 décembre 2015 11:27
> > To: openembedded-devel at lists.openembedded.org
> > Subject: [oe] QT5 application NOT generating core dump upon receiving
> > segmentation fault
> >
> > Hi,
> >
> > I am running a QT5 based application on TI AM335x EVM kit. I am using
> > meta-arago daisy configuration.
> >
> > My system is configured to generate core dump and core dumps are
> generated
> > whenever application receives segmentation fault (expected).
> >
> > But when my QT5 based application received SIGSEGV, then no core dump is
> > generated. It dies without "Segmentation fault" message on stdout.
> >
> > To debug this further, I added nullptr dereference in my application
> main()
> > before QApplication object is created and when executed, core dump was
> > created.
> > When I moved nullptr dereference after QApplication object is created,
> then
> > no core dump was created. Application died without any message.
> >
> > So it seems QT is handling SIGSEGV and not allowing to create core dump.
> >
> > Is it expected ? I believe not. What wrong am I doing and how to fix
> this ?
> >
> > thanks
> > Ankur
> > --
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