Segmentation fault while running Qt Helloworld on embedded system

Question

I cross-compiled a Helloworld executable for ARM. It worked well on my friend's development board, but failed with a " segmentation fault " on my board. The two boards are slightly different in both hardware and software.

My question is, how can I debug in my board? Is it relatively easy to debug such a simple program? Does it indicate that there's nothing wrong with the executable and the problem most probably lies in the filesystem of my board?

Below is the code:

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QPushButton hello("Hello world");
hello.resize(100, 30);

hello.show();
return app.exec();
}

And the executable is generated by the following commands:

qmake -project
qmake
make

The hardware/software differences sound like they are the cause. Its possible you may need to recompile Qt for your hardware with different parameters in your QMAKESPEC. — jlunavtgrad
Hi @beaver, can you try to change the optimization flag of the compiler (remove -O2) and try again — Dien Nguyen
Please don't put the answer in the question. Give the answer its own answer post, and mark it as the solution. — Eric Leschinski

sardok sardok · Accepted Answer · 2012-09-06T09:31:33

most probably gdb is ported to be run on ARM target but in case lack of that or for easy debugging, you should use gdb remote debugging. http://sourceware.org/gdb/onlinedocs/gdb/Remote-Debugging.html#Remote-Debugging

Gdbserver is the application should be run on target. the following is demonstration howto use it. (copied from wikipedia)

Target settings:

remote$ gdbserver :2345 hello_world
Process hello_world created; pid = 2509
Listening on port 2345

Host settings:

local$ gdb -q hello_world
Reading symbols from /home/user/hello_world...done.
(gdb) target remote 192.168.0.11:2345
Remote debugging using 192.168.0.11:2345
0x002f3850 in ?? () from /lib/ld-linux.so.2
(gdb) continue
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x08048414 in main () at hello_world.c:10
10              printf("x[%d] = %g\n", i, x[i]);
(gdb)

Segmentation fault while running Qt Helloworld on embedded system

4 Answers