#define _GNU_SOURCE
#include <sched.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <linux/futex.h>
#include <signal.h>

static char stack[32768];
static int tid;

static int foo(void *p)
{
	syscall(SYS_getpid);
	syscall(SYS_getpid);
	syscall(SYS_exit, 0);
}

int main()
{
	int pid = getpid();
	for (;;) {
		int x = clone(foo, stack+sizeof stack,
			CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND
			|CLONE_THREAD|CLONE_SYSVSEM //|CLONE_SETTLS
			|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID
			|CLONE_DETACHED,
			0, &tid, 0, &tid);
		syscall(SYS_futex, &tid, FUTEX_WAIT, x, 0);
		/* Should fail... */
		syscall(SYS_tgkill, pid, tid, SIGKILL);
	}
}