line numbers on segfault

Paul

Situation:
Running a MPI program that segfaults.
Cannot open program up in debugger due to nature of MPI system.
Using g++ 3.2.3.

Goal:
Find out which line it segfaults on; ideally which variable name causes
the error. Some kind of error message akin to VC7's "stack corrupted
around varname" message would be very nice.

Less ideally:
I'm told that core dumps aid in finding out what went wrong where.

a)Is a "stack corrupted around" message possible with gcc?
b)How can I force my program to core dump on exceptional exit?
Thanks,
Paul

Jul 22 '05 #1

Subscribe Reply

1667

Victor Bazarov

"Paul" <un******@rmci. net> wrote...

Situation:
Running a MPI program that segfaults.
Cannot open program up in debugger due to nature of MPI system.
Using g++ 3.2.3.

Goal:
Find out which line it segfaults on; ideally which variable name causes
the error. Some kind of error message akin to VC7's "stack corrupted
around varname" message would be very nice.

Less ideally:
I'm told that core dumps aid in finding out what went wrong where.

a)Is a "stack corrupted around" message possible with gcc?
b)How can I force my program to core dump on exceptional exit?

The only relevant term I've found is "variable". MPI, segfault, core
dump, debugger, while are well known, unfortunately mean very little
in a language newsgroup. Unless your problem is proven of a language
kind, you'll be better off in a newsgroup dedicated to your platform
or to your compiler. Since you didn't say what platform it was, I
can't recommend anything in particular, only 'comp.os.<your_ platform>',
but for g++ there is 'gnu.g++.help'.

If you think your problem _is_ of a language kind, please post the code
you think is responsible. Without code there is no real way to help
you.

Victor

Jul 22 '05 #2

E. Robert Tisdale

Paul wrote:

Situation:
Running a MPI program that segfaults.
Cannot open program up in debugger due to nature of MPI system.
I used Google

http://www.google.com/

to search for

+"Parallel DeBugger" +"MPI"

and I found lots of stuff.
We use TotalView

http://www.etnus.com/

You can download it and try it for free.
Using g++ 3.2.3.

Goal:
Find out which line it segfaults on; ideally which variable name causes
the error. Some kind of error message akin to VC7's "stack corrupted
around varname" message would be very nice.

Less ideally:
I'm told that core dumps aid in finding out what went wrong where.

a)Is a "stack corrupted around" message possible with gcc?
b)How can I force my program to core dump on exceptional exit?

If you can run on one node (the head node),
you might be able to use The GNU Debugger (gdb).

If you are intimately familiar with the source code (if you wrote it),
you can seed the source with printf statements
to help you locate the segfault.
You can quickly locate it using a binary search.
It can be a lot quicker than the debugger
unless you didn't write and don't understand the code very well.

Jul 22 '05 #3

Paul

[snips]

We use TotalView

http://www.etnus.com/

You can download it and try it for free.

It can be a lot quicker than the debugger
unless you didn't write and don't understand the code very well.

[/snips]

Thank you.

I appreciate the helpful reply.

-Paul

Jul 22 '05 #4

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