linux-kernel - Re: [RFC v8][PATCH 0/12] Kernel based checkpoint/restart

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Date:	Tue, 4 Nov 2008 12:44:36 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	Linus Torvalds <torvalds@...l.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC v8][PATCH 0/12] Kernel based checkpoint/restart

Quoting Oren Laadan (orenl@...columbia.edu):
> Basic checkpoint-restart [C/R]: v8 adds support for "external" checkpoint
> and improves documentation. Older announcements below.

The following test-program seems to reliably trigger a bug.  Run it in a
new set of namespaces, i.e.
	ns_exec -cmpiuU ./runme > /tmp/o
then control-c it.  The second time I do that, I get the dcache.c:666
BUG().

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>

#define __NR_checkpoint 333
int main (int argc, char *argv[])
{
	pid_t pid = getpid();
	int ret;

	close(0); close(2);
	ret = syscall (__NR_checkpoint, pid, STDOUT_FILENO, 0);

	if (ret < 0)
		perror ("checkpoint");
	else
		printf ("checkpoint id %d\n", ret);

	sleep(200);
	return (ret > 0 ? 0 : 1);
}

-serge
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