It might be useful to post the stack backtrace.

y

On 8/1/07, Andres Varon <avaron@gmail.com> wrote:
>
> Another bit of information is that I can segfault the program even
> for the most trivial input, with minimal computations involved. And
> when run under gdb, the backtrace lists pure OCaml function calls,
> and always the same one.
>
> On Aug 1, 2007, at 5:10 PM, Andres Varon wrote:
>
> > Hello Everyone,
> >
> > Has anyone observed sudden segfaults in OCaml 3.10.0 amd-64 under
> > linux? I have this program that has been run for quite a while
> > without any segfault (almost a year). It may run for weeks at a
> > time in parallel in our cluster, using as many as 256 processors at
> > a time. We delayed updating to 3.10.0 due to the changes in camlp4,
> > but the day before yesterday I worked on it, upgraded, and suddenly
> > a lot of the nightly unit tests in 64 bits fail with a segfault (a
> > LOT of them), when every test passed clean with 3.09.3. None of the
> > tests for other architectures fail though (windows, mac os X intel
> > and 32-bit ppc). One down side is that we have C structures
> > wrapped, so one may blame our program.
> >
> > However, efence and valgrind show no sign of problem, and the fact
> > that we have been using those structures for a while, and many test
> > iterations have passed for many inputs, and not only us, but many
> > people in other computers have compiled and run our program without
> > having segfaults ... I'm doubtful.
> >
> > Unfortunately I have been unable to compile 3.10.0 for 64 bits in
> > our g5 under Mac OS X, so that architecture remains untested. The
> > segfault is occurring within the OCaml code. Any pointer would be
> > greatly appreciated, or suggestions of tools that could help us
> > hunting this down ... I'm awfully clueless about what to do
> > today ... and it's been just a couple of days :-(
> >
> > best,
> >
> > Andres
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