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From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: abort() fails to terminate PID 1 process
Date: Sun, 3 Jul 2016 18:03:05 -0400	[thread overview]
Message-ID: <20160703220304.GL15995@brightrain.aerifal.cx> (raw)
In-Reply-To: <CAHvfa+Oic2pMpw3fb0ZVrJ9be-c3-S1K-JRMnywLxB+EoyVj6w@mail.gmail.com>

On Sat, Jun 18, 2016 at 10:32:23PM +0200, Karl Böhlmark wrote:
> Hi!
> 
> 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.
> 
> Instead of getting abnormal process termination we were seeing the process
> hanging at 100% cpu.
> 
> A minimal reproduction of this issue is to run
> 
> #include <stdlib.h>
> int main ()
> {
> abort();
> }
> 
> with "unshare --fork --pid" so that it runs as PID 1 in it's own PID
> namespace.
> 
> Would it be reasonable to add a fallback strategy in abort() for
> terminating processes when the signals don't have any effect?

I've improved the fallback strategy. It's not perfect yet but should
mitigate your issue:

https://git.musl-libc.org/cgit/musl/commit/?id=0c8bc102f287d3993751d80ba2dffb01e0c8bc7f

Rich


      parent reply	other threads:[~2016-07-03 22:03 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-18 20:32 Karl Böhlmark
2016-06-19  1:20 ` nathan
2016-06-20  9:02 ` Igmar Palsenberg
2016-06-20 10:04   ` Szabolcs Nagy
2016-06-20 12:00     ` Igmar Palsenberg
2016-06-20 19:41       ` Rich Felker
2016-07-03 10:43         ` Igmar Palsenberg
2016-07-03 13:58           ` Rich Felker
2016-07-03 19:58             ` Laurent Bercot
2016-07-03 20:01               ` Rich Felker
2016-07-03 20:20                 ` Laurent Bercot
2016-07-03 20:24                   ` Rich Felker
2016-07-04 13:38               ` Igmar Palsenberg
2016-07-04 13:37             ` Igmar Palsenberg
2016-07-05  3:07               ` Rich Felker
2016-07-30 21:24                 ` Igmar Palsenberg
2016-06-20 10:29 ` Natanael Copa
2016-07-03 22:03 ` Rich Felker [this message]

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