Unable to debug program, on raspberry Pi 3 from QT

[linuxTown]

Hi,

I am having trouble debugging program on Raspberry pi 3 via gdb. I cross compile, from Ubuntu machine to raspberry.
I followed tutorials from here:
https://medium.com/@amirmann/how-to-cross-compile-qt-for-raspberry-pi-3-on-linux-ubuntu-for-beginners-75acf2a078c
and
https://fecub.wordpress.com/2018/01/15/compile-qt-for-raspberry-pi/

If I try to run without debugging, program builds successfully, it deploys, I can start it on raspberry, but if I try to run and debug from qt I receive these messages:

Checking available ports...
Found 101 free ports.
Starting gdbserver...
Debugging starts

Listening on port 10001
Remote debugging from host 192.168.0.103
Process /home/pi/Program created; pid = 5062
Remote side has terminated connection. GDBserver will reopen the connection.
Listening on port 10001
Debugging has finished

I am using gdb multiarch on Ubuntu and gdbserver from apt-get on raspberry. Every time I try to debug, new port opens and I receive same message. What could be wrong?

[aha_1980]

Hi @linuxTown

can you please post the contents of Window > Views > Debugger Log? It may contain more information to isolate the problem.

Regards

[linuxTown]

Hi, @aha_1980

I pasted output here:
https://pastebin.com/Lt3kjMTM

One of the lines says, that executable was not found, but there is, I can see it and run it on my pi.

[aha_1980]

@linuxTown

I don't see any obvious, except the "path not found" errors.

Can you check that the path to your executable does not contain spaces or other special characters?

[linuxTown]

@aha_1980

There aren't any special characters in path, and no spaces...

I am just a begginer, so it's hard to know whats wrong.

And what about these lines? Are they related to file not being found?
//---------------------
...

~"/build/gdb-9un5Xp/gdb-7.11.1/gdb/thread.c:982: internal-error: is_thread_state: Assertion tp' failed.\nA problem internal to GDB has been detected,\nfurther debugging may prove unreliable.\nQuit this debugging session? " ~"(y or n) [answered Y; input not from terminal]\n" &"\nThis is a bug, please report it." &" For instructions, see:\n<http://www.gnu.org/software/gdb/bugs/>." &"\n\n" ~"/build/gdb-9un5Xp/gdb-7.11.1/gdb/thread.c:982: internal-error: is_thread_state: Assertion tp' failed.\nA problem internal to GDB has been detected,\nfurther debugging may prove unreliable.\nCreate a core file of GDB? "
dQUIT DEBUGGER REQUESTED IN STATE 19
~"(y or n) [answered Y; input not from terminal]\n"

dHANDLE GDB ERROR: The process was ended forcefully.
dProcess crashed
....
//------------------------------------

[aha_1980]

@linuxTown the lines may be related to your problem, but let's check first the project path on your host PC also. does the program has the same name there?

[linuxTown]

@aha_1980

I just recreated project, from scratch, now I can go a bit further. Program has same name on host and raspberry. The path to project is a bit diferent, its in:
/home/tt/build-Project-Raspberry_pi-Debug/Program

Now if I try to debug, I receive this message:

and here is the log:
https://pastebin.com/dtZFcgBc

[aha_1980]

@linuxTown yeah, looks better. could you try a non-GUI aka console program first ?

[linuxTown]

@aha_1980

Thank you for helping, I just found in this tutorial comments solution:
https://www.baldengineer.com/raspberry-pi-gui-tutorial.html

It appears, I was missing $DISPLAY variable.
I just did these steps:
– sudo nano ~/.profile
– I added the following line to the end: export DISPLAY=:0
– Reboot: sudo reboot <–This is a must!!!!!

Now I am able to run with debugger. But now, when I add breakpoint in code I once again get new error :/

Listening on port 10001
Remote debugging from host 192.168.0.103
Process /home/pi/Project created; pid = 967
libEGL warning: DRI2: failed to authenticate
Could not load shared library symbols for /usr/lib/arm-linux-gnueabihf/libtxc_dxtn.so.
Do you need "set solib-search-path" or "set sysroot"?

If I can't find solution, then I will try console program.

[linuxTown]

@aha_1980

I just used code form this website and now I can run program and debug it, finally :)

https://catonrug.blogspot.lt/2018/01/libegl-warning-dri2-failed-authenticate.html

[aha_1980]

@linuxTown: Cool - Thanks for your feedback.

So please mark this thread as solved now.