[erlang-questions] Erlang node core dumps

Akash Chowdhury <>
Sat Oct 15 04:41:15 CEST 2016


Hi,
Thanks a lot for the reply. Our servers are of Solaris
Regards.
On Friday, October 14, 2016, Per Hedeland <> wrote:

> On 2016-10-13 19:28, Akash hury wrote:
> >
> > I am getting following core dump (log when core was loaded using gdb)
> >
> >
> >
> > Core was generated by `/apps/erlang/19.0/lib/erlang/
> erts-8.0/bin/beam.smp
> > -K true -P 2000001 -A 15 -W'.
> >
> > Program terminated with signal SIGKILL, Killed.
>
> SIGKILL is, when not the result of a frustrated and/or incompetent user,
> the hallmark of the Linux OOM (Out Of Memory) killer, called upon when
> the Linux kernel's habit of giving out more memory than it actually has
> available comes back to bite it in the *ss, and obliging by randomly
> killing perfectly innocent processes. Sort of...
>
> But there is something very wrong here, since SIGKILL should *not*
> generate a core dump, and since it is uncatchable, there's no way an
> application such as the Erlang VM can *make* it generate a core dump.
> Thus I'm leaning towards a comment from a quick googling, which I from
> experience know to have some merit: "Don't trust gdb". I.e. the core
> dump may actually be somehow corrupt, and the SIGKILL info simply wrong.
>
> In any case *if* you are running Linux, and the OOM killer hit you, it
> should be logged in /var/log/messages or the like.
>
> > #0  0xffffffff7dddc1a0 in __pollsys () from /lib/64/libc.so.1
> >
> > #1  0xffffffff7ddcaf54 in _pollsys () from /lib/64/libc.so.1
> >
> > #2  0xffffffff7dd75f7c in pselect () from /lib/64/libc.so.1
> >
> > #3  0xffffffff7dd76320 in select () from /lib/64/libc.so.1
>
> Hm, select() - I guess you are *not* running Linux? Anyway, this does
> not seem to me to be an issue with the Erlang VM, but rather with your
> OS / system.
>
> --Per Hedeland
>
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