linux-kernel - Re: [PATCH 0/2] oom && coredump

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Date:	Fri, 28 Nov 2014 20:28:05 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] oom && coredump

On 11/28, Oleg Nesterov wrote:
>
> On 11/27, Oleg Nesterov wrote:
> >
> > So I think the patch below makes sense anyway. Although I should probably
> > split it and remove PT_TRACE_EXIT in 2/2.
>
> So let me send the patches.
>
> David, Michal, could you review and ack/nack these changes explicitly?
>
> Let me repeat once again that this patch doesn't pretend to solve
> all problems, even with the coredumping. And I have to admit that
> my main motivation is 2/2, this PT_TRACE_EXIT check annoys me ;)

Another simple test. cat mtsleep.c:

	#include <unistd.h>
	#include <pthread.h>

	void *tfunc(void *arg)
	{
		pause();
		return NULL;
	}

	int main(void)
	{
		pthread_t th;

		pthread_create(&th, NULL, tfunc, NULL);
		pause();

		return 0;
	}

Now,

	# echo '|/bin/sleep 1000' >> /proc/sys/kernel/core_pattern
	# echo 10 >> /proc/sys/kernel/core_pipe_limit

	# ./mtsleep &
	# kill -QUIT %1
	# perl -e 'push @_,"x" x 1000_1000 while 1'

Before this series the system hangs and doesn't respond. With these
patches it correctly kills perl.

Oleg.

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