Date: Tue, 4 Nov 2008 12:44:36 -0600
From: "Serge E. Hallyn" <serue@us.ibm.com>
To: Oren Laadan <orenl@cs.columbia.edu>
Cc: Linus Torvalds <torvalds@osdl.org>, containers@lists.linux-foundation.org,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org,
       linux-api@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Dave Hansen <dave@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: [RFC v8][PATCH 0/12] Kernel based checkpoint/restart
Message-ID: <20081104184436.GA16328@us.ibm.com>
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Quoting Oren Laadan (orenl@cs.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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