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problem with debian Buster and debugging thread in Qt5

From Vincent charente@21:1/5 to All on Tue Mar 30 10:30:02 2021

XPost: linux.debian.user.french

Dear All,

I am sending you this email because I encounter a problem with Debian
Buster and default Qt5 package.

I installed packages below :

· debian 10.8 x86_64 (amd64)

· apt-get install build-essentials

· apt-get install gdb

· apt-get install qt5-default

· apt-get install qtcreator

I have tried to debug an application which contains a thread with GBD but
GDB stops when thread starts. I tried to build GDB with last sources but
the problem still remains.

*This problem doesn’t exist with Debian 9 *with the same procedure of installation.

You can find a simple example which increments a counter in a thread every 500ms at the URL below https://pastebin.com/WegsL9vd.

Do you know if there is a way to solve this problem ?

Best regards

<div dir="ltr">
Dear All,

 

I am sending you this email because I
encounter a problem with Debian Buster and default Qt5 package.

I installed packages below :

·
debian 10.8
x86_64 (amd64)

·
apt-get
install build-essentials

·
apt-get
install gdb

·
apt-get
install qt5-default

·
apt-get
install qtcreator

 

I have tried to debug an application
which contains a thread with GBD but GDB stops when thread starts. I tried to build GDB with last sources but the problem still remains.

This problem doesn’t exist with
Debian 9 with the same procedure of installation. You can find a simple example which
increments a
counter in a thread every 500ms at the URL below <a href="https://pastebin.com/WegsL9vd">https://pastebin.com/WegsL9vd</a>.

 

Do you know if there is a way to solve
this problem ?

 

Best regards

</div>

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From =?UTF-8?Q?Lisandro_Dami=C3=A1n_Nica@21:1/5 to perezmeyer@gmail.com on Tue Mar 30 15:10:02 2021

XPost: linux.debian.user.french

Hi again!

On Tue, 30 Mar 2021 at 09:55, Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com> wrote:

[snip]

In fact I can reproduce your issue and at the same time I can make it
work under gdb itself, so the issue seems to be in Qt Creator. I've reproduced the issue with Qt Creator from unstable, so let me suggest
you to file a bug upstream: http://https://bugreports.qt.io Do not
forget to upload this test code, it's very straightforward and so a
nice example for an upstream issue.

Actually it is not an issue but a feature. Qt Creator is stopping the
execution when it receives a signal from gdb, in this case SIGSTOP.
Add a breakpoint inside the thread code and press F5 to start
debugging. If you accept the message and press F10 (step) some times
you will be able to reach the code.

You can tell Qt Creator to ignore the signal. Check https://forum.qt.io/topic/100958/catching-unix-interrupt-signal-on-console-application-when-debugging-with-qtcreator/2

I've added

handle SIGSTOP pass nostop noprint

And it just worked :-)

--
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

From =?UTF-8?Q?Lisandro_Dami=C3=A1n_Nica@21:1/5 to Vincent charente on Tue Mar 30 15:00:01 2021

XPost: linux.debian.user.french

Hi Vincent!

On Tue, 30 Mar 2021 at 05:29, Vincent charente <vincecharente@gmail.com> wrote:

Dear All,

I am sending you this email because I encounter a problem with Debian Buster and default Qt5 package.

I installed packages below :

· debian 10.8 x86_64 (amd64)

· apt-get install build-essentials

· apt-get install gdb

· apt-get install qt5-default

This one is really not needed at all, feel free to remove it.

· apt-get install qtcreator

I have tried to debug an application which contains a thread with GBD but GDB stops when thread starts. I tried to build GDB with last sources but the problem still remains.

This problem doesn’t exist with Debian 9 with the same procedure of installation.

You can find a simple example which increments a counter in a thread every 500ms at the URL below https://pastebin.com/WegsL9vd.

Do you know if there is a way to solve this problem ?

In fact I can reproduce your issue and at the same time I can make it
work under gdb itself, so the issue seems to be in Qt Creator. I've
reproduced the issue with Qt Creator from unstable, so let me suggest
you to file a bug upstream: http://https://bugreports.qt.io Do not
forget to upload this test code, it's very straightforward and so a
nice example for an upstream issue.

--
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

From Vincent charente@21:1/5 to All on Tue Mar 30 16:30:02 2021

XPost: linux.debian.user.french

Hi Lisandro,

Great, it works with handle SIGSTOP pass nostop noprint. I think I had
already tried but I forgot "pass".

Thank you very much

Le mar. 30 mars 2021 à 15:04, Lisandro Damián Nicanor Pérez Meyer < perezmeyer@gmail.com> a écrit :

Hi again!

On Tue, 30 Mar 2021 at 09:55, Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com> wrote:

[snip]

In fact I can reproduce your issue and at the same time I can make it
work under gdb itself, so the issue seems to be in Qt Creator. I've reproduced the issue with Qt Creator from unstable, so let me suggest
you to file a bug upstream: http://https://bugreports.qt.io Do not
forget to upload this test code, it's very straightforward and so a
nice example for an upstream issue.

Actually it is not an issue but a feature. Qt Creator is stopping the execution when it receives a signal from gdb, in this case SIGSTOP.
Add a breakpoint inside the thread code and press F5 to start
debugging. If you accept the message and press F10 (step) some times
you will be able to reach the code.

You can tell Qt Creator to ignore the signal. Check

https://forum.qt.io/topic/100958/catching-unix-interrupt-signal-on-console-application-when-debugging-with-qtcreator/2

I've added

handle SIGSTOP pass nostop noprint

And it just worked :-)

--
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/

<div dir="ltr"><div>Hi Lisandro,</div><div> </div><div>Great, it works with handle SIGSTOP pass nostop noprint. I think I had already tried but I forgot "pass".</div><div> </div><div>Thank you very much 

</div></div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le mar. 30 mars 2021 à 15:04, Lisandro Damián Nicanor Pérez Meyer <<a href="mailto:perezmeyer@gmail.com">perezmeyer@gmail.com</a>> a écrit : </div><blockquote
class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi again! 

On Tue, 30 Mar 2021 at 09:55, Lisandro Damián Nicanor Pérez Meyer 
<<a href="mailto:perezmeyer@gmail.com" target="_blank">perezmeyer@gmail.com</a>> wrote: 
> 
[snip] 
> 
> In fact I can reproduce your issue and at the same time I can make it > work under gdb itself, so the issue seems to be in Qt Creator. I've 
> reproduced the issue with Qt Creator from unstable, so let me suggest > you to file a bug upstream: http://<a href="https://bugreports.qt.io" rel="noreferrer" target="_blank">https://bugreports.qt.io</a> Do not 
> forget to upload this test code, it's very straightforward and so a 
> nice example for an upstream issue. 

Actually it is not an issue but a feature. Qt Creator is stopping the execution when it receives a signal from gdb, in this case SIGSTOP. 
Add a breakpoint inside the thread code and press F5 to start 
debugging. If you accept the message and press F10 (step) some times 
you will be able to reach the code. 

You can tell Qt Creator to ignore the signal. Check 
<a href="https://forum.qt.io/topic/100958/catching-unix-interrupt-signal-on-console-application-when-debugging-with-qtcreator/2" rel="noreferrer" target="_blank">https://forum.qt.io/topic/100958/catching-unix-interrupt-signal-on-console-application-when-
debugging-with-qtcreator/2</a> 

I've added 

handle SIGSTOP pass nostop noprint 

And it just worked :-) 

-- 
Lisandro Damián Nicanor Pérez Meyer 
<a href="http://perezmeyer.com.ar/" rel="noreferrer" target="_blank">http://perezmeyer.com.ar/</a> 
<a href="http://perezmeyer.blogspot.com/" rel="noreferrer" target="_blank">http://perezmeyer.blogspot.com/</a> 
</blockquote></div>

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problem with debian Buster and debugging thread in Qt5

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