GDB debug segmentation fault
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gcc -g -o hello hello.c
Without debugging symbols, gdb won’t be able to do much.
2) Linux should core-dump on segmentation fault. Set:ulimit -c unlimited
(man ulimit for more info)
Now just run that the excutable that is segfaulting. As soon as it segfaults, you should get an output something like "Segmentation fault (core dumped)". ls in your working directory and you will find a new core file has been created (probably with the name core.{pid})
Now, we just have to tell gdb to analyze this core. Here’s howgdb {executable} {dump file}
eg. gdb hello core.1324
Check out the output spit out by gdb and make sure that all debugging symbols have been loaded.
Now, on the gdb prompt:
(gdb) bt
(bt = backtrace .. prints stack strace)
with this backtrace you’ll now know *exactly* where the program segfaulted. The code file, line number and the call which was the culprit.
You can even analyze variable values on any frame. Just change to that frame:(gdb) frame {num}
eg. (gdb) frame 2
and use:(gdb) info locals
(gdb) info args
to query the values of local variables and passed arguments, respectively.
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