GDB

root@valkyrie:~# gdb /opt/apm/bin/ArduCopter-quad
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /opt/apm/bin/ArduCopter-quad...done.
(gdb) run
Starting program: /opt/apm/bin/ArduCopter-quad
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
Raspberry Pi 2 with BCM2709!

Program received signal SIGSEGV, Segmentation fault.
memset () at ../ports/sysdeps/arm/memset.S:35
35      ../ports/sysdeps/arm/memset.S: No such file or directory.
(gdb) bt
#0  memset () at ../ports/sysdeps/arm/memset.S:35
#1  0x0002ddd8 in Memory_table::Memory_table (this=0xb8098,
    page_count=<optimized out>, version=470097920)
    at /home/george/Documents/code/emlid/navio/NavioPackageBuilder/ardupilot/libraries/AP_HAL_Linux/RCInput_Navio.cpp:127
#2  0x0002e608 in Linux::LinuxRCInput_Navio::LinuxRCInput_Navio (
    this=0xb6800 <rcinDriver>)
    at /home/george/Documents/code/emlid/navio/NavioPackageBuilder/ardupilot/libraries/AP_HAL_Linux/RCInput_Navio.cpp:409
#3  0x0000a4c0 in __static_initialization_and_destruction_0 (
    __initialize_p=1, __priority=65535)
    at /home/george/Documents/code/emlid/navio/NavioPackageBuilder/ardupilot/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp:79
#4  _GLOBAL__sub_I__ZN9HAL_LinuxC2Ev ()
    at /home/george/Documents/code/emlid/navio/NavioPackageBuilder/ardupilot/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp:220
#5  0x00093204 in __libc_csu_init ()
#6  0x76d985ee in __libc_start_main (main=0xa0c4 <main(int, char* const*)>,
    argc=1, argv=0x7efff7c4, init=0x931b8 <__libc_csu_init>,
    fini=0x93218 <__libc_csu_fini>, rtld_fini=0x76fea4c5 <_dl_fini>,
    stack_end=0x7efff7c4) at libc-start.c:246
#7  0x0000a7fc in _start ()
(gdb) list
30      in ../ports/sysdeps/arm/memset.S
(gdb) q
A debugging session is active.

        Inferior 1 [process 4218] will be killed.

Quit anyway? (y or n) y
root@valkyrie:~#