How can I get a stack trace if my program crashes?#
The classical approach to find the location where your program crashed is to run it in a debugger or inspect a core file with the debugger. A quick way to get the stack trace without the need for a debugger is to compile your program with the following options:
$ ifort -g -O0 -traceback -o my_program my_program.f90
In case of segment violation during execution of the program, detailed information on the location of the problem (call stack trace with routine names and line numbers) will be provided:
$ ./my_program forrtl: severe (174): SIGSEGV, segmentation fault occurred Image PC Routine Line Source ... my_program 0000000000403360 Unknown Unknown Unknown libpthread.so.0 00007F8465324710 Unknown Unknown Unknown my_program 0000000000402F5E mo_calc_sum_mp_ca 10 my_program.f90 my_program 00000000004031A1 MAIN__ 26 my_program.f90 my_program 0000000000402E5E Unknown Unknown Unknown libc.so.6 00007F8464D9BD5D Unknown Unknown Unknown my_program 0000000000402D69 Unknown Unknown Unknown
Real debuggers like Arm DDT installed on DKRZ HPC systems will allow you to get much more information in case the problem is not easily identified.