topic Debugging Issue on imx6UL in i.MX Processors

Debugging Issue on imx6UL

enginfirat — Tue, 07 Mar 2017 13:17:05 GMT

Hello all,

We have a Qt based application and it compiles and runs successfully on target board. However, when we try to debug the application, SEGV signal got from the application and application stops running. Below please find the output:

0x76fcfac0 in ?? () from /toolchain/sysroots/cortexa7hf-vfp-neon-dey-linux-gnueabi/lib/ld-linux-armhf.so.3
The target endianness is set automatically (currently little endian)

Program received signal SIGSEGV, Segmentation fault.
0x76fdfa98 in ?? () from /toolchain/sysroots/cortexa7hf-vfp-neon-dey-linux-gnueabi/lib/ld-linux-armhf.so.3

To debug the application, we start the gdbserver in target platform and we simply start the gdb (compiled within the cross tool chain).

However the same application runs without any problems when we simply run the application from the console.

Please find below the used Ecplise debugger settings for debugging the application:

GDB Debugger: /toolchain/sysroots/x86_64-deysdk-linux/usr/bin/arm-dey-linux-gnueabi/arm-dey-linux-gnueabi-gdb

GDB Command Line: (Below is the file content)

set sysroot /toolchain/sysroots/cortexa7hf-vfp-neon-dey-linux-gnueabi
set auto-load safe-path /

Using GDB (DSF) Manual Remote Debugger Launcher

Why there is such problem?

Sincerely.

Re: Debugging Issue on imx6UL

igorpadykov — Wed, 08 Mar 2017 00:00:43 GMT

Hi Engin

please check AN5229 ARM DS-5 Development Studio Debug i.MX6UL-EVK
http://www.nxp.com/assets/documents/data/en/application-notes/AN5229.pdf
AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
http://www.nxp.com/assets/documents/data/en/application-notes/AN4553.pdf

Best regards
igor
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Re: Debugging Issue on imx6UL

enginfirat — Wed, 08 Mar 2017 09:21:18 GMT

Hello Igor,

Actually, I setup an environment like mentioned in Document AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors. However as I have mentioned, whenever the debugging starts immediately SIGSEGV is thrown and debugging stops. Program does not break at any break point.

Sincerely.

Re: Debugging Issue on imx6UL

igorpadykov — Wed, 08 Mar 2017 11:27:47 GMT

Hi Engin

is it working without Qt, just linux.

Best regards
igor

Re: Debugging Issue on imx6UL

enginfirat — Fri, 10 Mar 2017 13:49:49 GMT

Hello Igor,

I have tried with two simple projects, one with Qt and one without Qt. For both tries, I was able to debug the application without any problems.

As an another try, I have moved the application to QtCreator IDE and built and compiled it. The debugging attempt with Qt also produces a SIGSEGV however this time I was able to see where the executable access to invalid memory. Please see the attached screenshots:

(Ps. Above the line 55 is where the cursor hangs)

After a little search on problem I have found a stackoverflow thread:

boost - Segmentation fault only during GDB debugging - Stack Overflow

Were you or any people from community faced this problem before? What is your opinion about the problem?

Sincerely.