Quoting Oren Laadan (orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org):

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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