Could someone tell me why my application always freezes

Qingshui Kong · J J.Hilk 25 Apr 2019, 10:33

@J.Hilk Thank you.

Qingshui Kong · 6 May 2019, 04:51

@J.Hilk
I installed Qt 5.9.8 after I uninstalled Qt5.9.1. Then I compiled my project.
I copied the executable file and lib files compiled by Qt 5.9.8 to the destination PC. Then I started the application. But unfortunately, it still froze when i touch the screen after I leave it alone for hours.
Could you give me more advice? Now I don't know what to do to solve the problem.
The system is Ubuntu 16.04
Thank you in advance.

J.Hilk · 6 May 2019, 05:04

Hi @Qingshui-Kong

I'm afraid I don't have many more ideas.

Have you tried with a minimal project ? To test your device touchscreen. Maybe everything is working as expected and it's actually something in your code?

Qingshui Kong · J J.Hilk 6 May 2019, 04:51

@J.Hilk
OK. Thanks.
I haven't tried with a minimal project.
I also think there should be something wrong in my code. But I have checked the code, and didn't find anything wrong. So I need some help.
What's more, the application is fullscreen. And I haven't tried normal window yet.
Thanks.

Qingshui Kong · 5 Aug 2019, 06:41

Once, it reproduced, I debuged it. And here is some log.

dRUNNING NEEDS-STOP COMMAND -file-list-exec-source-files
sStopping temporarily
dState changed from InferiorRunOk(11) to InferiorStopRequested(13) [master]
dCALL: INTERRUPT INFERIOR
sAttempting to interrupt.
sStop requested...
dTRYING TO INTERRUPT INFERIOR
dInterrupted 2214

~"\nThread "
~"1 "VXFoodInspectio" received signal SIGINT, Interrupt.\n"
~"pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185\n"
&"185\t../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: No such file or directory.\n"
*stopped,reason="signal-received",signal-name="SIGINT",signal-meaning="Interrupt",frame={addr="0x00007ffff3623360",func="pthread_cond_wait@@GLIBC_2.3.2",args=[],file="../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S",fullname="/build/glibc-bfm8X4/glibc-2.23/nptl/../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S",line="185"},thread-id="1",stopped-threads="all",core="0"
dNOTE: INFERIOR STOP OK
sStopped.
dState changed from InferiorStopRequested(13) to InferiorStopOk(14) [master]
HANDLING QUEUED COMMANDS AFTER TEMPORARY STOP
<22-file-list-exec-source-files
dNOTE: INFERIOR RUN REQUESTED
sRun requested...
dState changed from InferiorStopOk(14) to InferiorRunRequested(10) [master]
sRunning requested...
<23-exec-continue

Could someone give me some advice to analyze it?

Christian Ehrlicher · 8 May 2019, 01:12

A backtrace would be useful I guess.

Qingshui Kong · wrote on 8 May 2019, 01:12

@Christian-Ehrlicher
Thank you very much.

But how can I use it, if the thread is locked?

Could you tell me in detail?

Christian Ehrlicher · 8 May 2019, 05:21

http://sourceware.org/gdb/onlinedocs/gdb/Backtrace.html

Qingshui Kong · 5 Aug 2019, 05:22

@Christian-Ehrlicher
Thanks.

I think it's a gdb command.

But the application doesn't crash. Actually, it freezes. How can it produces dump file?

I am not very familar with this. Could you tell me?

Qingshui Kong · 5 Aug 2019, 06:41

I find a new sympton.

I opened a modal dialog. Then I left it alone. Several hours later, I touch outside the dialog. My application froze.
As I know, if i touch outside of a modal dialog., it will do nothing. At least, it doesn't run into any code that I designed.

So, how could that happen?

If someone see this, please give me some advice. Thanks!

Christian Ehrlicher · wrote on 8 May 2019, 10:26

@Qingshui-Kong said in Could someone tell me why my application always freezes:

But the application doesn't crash.

You can jump into the Debugger by pressing CTRL+C on the debugger command line (when you started from console)

Jitendra Sharma · wrote on 31 Jan 2023, 04:18

Have you found any solution to this problem? or what was causing the issue?