Segmentation fault on example

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1

Hi all,

I recently found RIOT OS and decide to give it a try. However, I got segmentation fault when I tried to run the example. Here is the step I take:

  • clone the RIOT source git clone https://github.com/RIOT-OS/RIOT.git
  • compile the example for linux machine (I already have the GCC toolchains installed) cd examples/hello-world make
  • run the example (the .elf file)

./bin/native/hello-world.elf Segmentation fault I also tried other example (default) without luck. Is there something that I miss? I have not changed anything on the makefile, and I check that the BOARD is native, which is the correct target (according to the RIOT wiki) if I want to run it on linux machine.

Thanks. Regards,

2

Hi Victor,

which versions of gcc, libc and Linux are you using, and on which architecture are you running it?

With current master I don't have any trouble with:     cd examples/hello-world     make -B clean all     make term

Cheers, Ludwig

3

Hi Victor,

I don't know what's wrong there.. As the support for your Ubuntu version is running out shortly I won't look into it.

Maybe you can upgrade your Ubuntu to 13.10, Saucy Salamander. I know it's working there.

Otherwise I can only do some wild guessing now - maybe there are some CFLAGS in your environment (env / echo $CFLAGS)? Does the binary really use the correct libraries (ldd bin/native/*elf)?

You could also rebuild with "CFLAGS=-g make -B clean all" and run in gdb ("make debug", gdb command: "run") and investigate the segfault (gdb command: "bt full").

Cheers, Ludwig

4

Hi Ludwig,

i am having the same problem as reported below by Victor.

I did: $ git clone https://github.com/RIOT-OS/RIOT.git $ cd RIOT/examples/hello-world $ make -B clean all $ make term /home/***/RIOT/examples/hello-world/bin/native/hello-world.elf make: *** [term] Segmentation fault (core dumped)

A couple of weeks ago (before the announcement of release 2014.01), i already had a go on RIOT, and i am pretty sure - yet without proof! - that i was able to run the hello world example on the native build. Now i did a git clone again.

My system is: - Ubuntu 12.04.4 LTS, x86/32bit - As cross compiler i use the binaries from https://launchpad.net/gcc-arm-embedded, version gcc-arm-none-eabi-4_8-2013q4

For the versions i'm not so sure, so i try to give some hints:

GCC-Version: $ cd   ./gcc-arm-none-eabi-4_8-2013q4/bin/arm-none-eabi-gcc --version arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.8.3 20131129 (release) [ARM/embedded-4_8-branch revision 205641] Copyright (C) 2013 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

For the libc, i really don't know(, also not much about it!). When i run as proposed in http://stackoverflow.com/questions/9705660/check-glibc-version-for-a-particular-gcc-compiler to find out the version, $ gcc glibc-version.c -o glibc-version $ ./glibc-version GNU libc version: 2.15

But, compiling it with the cross-compiler (above), doesn't work $ ~/gcc-arm-none-eabi-4_8-2013q4/arm-none-eabi/bin/gcc glibc-version.c -o glibc-version gcc: error trying to exec 'cc1': execvp: No such file or directory

and also $ ~/gcc-arm-none-eabi-4_8-2013q4/bin/arm-none-eabi-gcc glibc-version.c -o glibc-version glibc-version.c:3:30: fatal error: gnu/libc-version.h: No such file or directory   #include <gnu/libc-version.h>                                ^ compilation terminated.

Looks like either - i don't have libc ready for cross-compiling...? - Don't know how to use my cross-compiler...

Do you have any suggestions?

Thanks, Janos

5

One more info: my native GCC version is $gcc --version gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

Cheers Janos

6

Hi Ludwig,

concerning this issue from the users list, i though with these new clues it's more a developer thing?

I tracked down the commit, after which things don't work for me, on both my ubuntu machines (although almost identical setup, except hardware).

when i do      $ git log i get, among others:

     commit 4939473afbcfe981b6411595a3b73e792ae28775      Author: Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>

7

I'll look into it when I'm back on my feet.

Cheers, Ludwig

8

Hi Ludwig,

I am going to take your suggestion to use newer distro since I have no problem with that yet.

in case you are still interested, below are some info related to your last email:

  • I have no CFLAGS set on my environment.
  • output of ldd bin/native/*elf is: linux-gate.so.1 => (0xf7716000) libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf76e7000) librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf76de000) libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7533000) /lib/ld-linux.so.2 (0xf7717000) libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7518000)
  • I added the “CFLAGS=-g make -B clean all” on the makefile, rebuild it and run it on gdb. Here is the output of bt full: (gdb) bt full #0 0x00000000 in ?? () No symbol table info available. #1 0x0804a970 in calloc () No symbol table info available. #2 0x555a23ae in ?? () from /lib/i386-linux-gnu/libdl.so.2 No symbol table info available. #3 0x555a1de4 in dlsym () from /lib/i386-linux-gnu/libdl.so.2 No symbol table info available. #4 0x0804917b in startup () No symbol table info available. #5 0x0804b962 in __libc_csu_init () No symbol table info available. #6 0x555c946a in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6 No symbol table info available. #7 0x08048ca1 in _start () No symbol table info available.

Thanks. Regards,

One more info: my native GCC version is $gcc --version gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

Cheers Janos

9

Hi Janos,

as you might have noticed, I opened a PR that addresses the problem: https://github.com/RIOT-OS/RIOT/pull/762

Please check if it works for you: $ git remote add ludwig https://github.com/LudwigOrtmann/RIOT $ git fetch ludwig $ git checkout issue_741

Build your application, run it, post a comment (preferably in github) whether it fixes the problem.

Once the PR has been merged, go back to master: $ git checkout master

Cheers, Ludwig

10

Hi Victor,

Thank you for your cooperation, I think the issue has been resolved with this PR: https://github.com/RIOT-OS/RIOT/pull/762

If you did not get around to upgrading your distro yet, it might work with that patch.

Check here for instructions: http://lists.riot-os.org/pipermail/devel/2014-February/000558.html

Cheers, Ludwig

11

Hi Ludwig,

i have by now also updated my ubuntu to the Saucy Salamander, where this problem doesn't occur.

To reproduce the problem and check the solution, i set up a Virtualbox VM with Ubuntu 12.04 Precise, set up the toolchain, checked out master of RIOT, built and ran, and saw the segmentation fault. After checking out the issue_741, i built and ran the hello-world example, and it worked fine.

Thanks for your support!

Cheers Janos

12

Thanks a lot! The PR has been merged.

Cheers, Ludwig