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From: Natanael Copa <ncopa@alpinelinux.org>
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Subject: Re: abort() fails to terminate PID 1 process
Date: Mon, 20 Jun 2016 12:29:26 +0200
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On Sat, 18 Jun 2016 22:32:23 +0200
Karl B=F6hlmark <karl.bohlmark@gmail.com> wrote:

> Hi!
>=20
> After running alpine-linux based docker containers for a while we noticed
> some problematic behaviour when one of our services had a memory leak
> causing the process to abort.
>=20
> Instead of getting abnormal process termination we were seeing the process
> hanging at 100% cpu.
>=20
> A minimal reproduction of this issue is to run
>=20
> #include <stdlib.h>
> int main ()
> {
> abort();
> }
>=20
> with "unshare --fork --pid" so that it runs as PID 1 in it's own PID
> namespace.
>=20
> Would it be reasonable to add a fallback strategy in abort() for
> terminating processes when the signals don't have any effect?

A workaround is to run your service under a minimalistic init like tini
https://github.com/krallin/tini

Then your application will no longer run as pid 1.

-nc