panic: vm_map_wire: lookup failed

Hi,

The latest development source of ntpd started to use setrlimit() before
using mlockall(). This combination proves fatal on -current. The code
in ntpd/ntpd.c looks like this:

###########
#if defined(HAVE_MLOCKALL) && defined(MCL_CURRENT) && defined(MCL_FUTURE)
# ifdef HAVE_SETRLIMIT
	/*
	 * Set the stack limit to something smaller, so that we don't lock a lot
	 * of unused stack memory.
	 */
	{
	    struct rlimit rl;

	    if (getrlimit(RLIMIT_STACK, &rl) != -1
		&& (rl.rlim_cur = 20 * 4096) < rl.rlim_max)
	    {
		    if (setrlimit(RLIMIT_STACK, &rl) == -1)
		    {
			    msyslog(LOG_ERR,
				"Cannot adjust stack limit for mlockall: %m");
		    }
	    }
	}
# endif /* HAVE_SETRLIMIT */
	/*
	 * lock the process into memory
	 */
	if (mlockall(MCL_CURRENT|MCL_FUTURE) < 0)
		msyslog(LOG_ERR, "mlockall(): %m");
#else /* not (HAVE_MLOCKALL && MCL_CURRENT && MCL_FUTURE) */
###########

The panic message is:

panic: vm_map_wire: lookup failed

and a backtrace looks like this:

##############
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc047ff07 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc04801c8 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc055a714 in vm_map_wire (map=0xc0e0c6e4, start=0, end=3216949248, 
    flags=3) at /usr/src/sys/vm/vm_map.c:1919
#4  0xc055d113 in mlockall (td=0x0, uap=0xc6361d14)
    at /usr/src/sys/vm/vm_map.h:201
#5  0xc0591efb in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1077936788, tf_esi = 2, tf_ebp = -1077936904, tf_isp = -969532044, tf_ebx = -1077936944, tf_edx = 0, tf_ecx = 9, tf_eax = 324, tf_trapno = 12, tf_err = 2, tf_eip = 673338079, tf_cs = 31, tf_eflags = 658, tf_esp = -1077937108, tf_ss = 47})
    at /usr/src/sys/i386/i386/trap.c:1006
#6  0xc0584c5d in Xint0x80_syscall () at {standard input}:144
---Can't read userspace from dump, or kernel process---

(kgdb) 
##############

John
-- 
John Hay -- John.Hay_at_icomtek.csir.co.za / jhay_at_FreeBSD.org