if runtime.GOOS == "solaris" || runtime.GOOS == "illumos" {
		// Solaris/Illumos have a lower limit, above which wait returns
		// EINVAL (see waitid in usr/src/uts/common/os/exit.c in
		// illumos). This is configurable via sysconf(_SC_MAXPID), but
		// we'll just take the default.
		pid = 30000-1
	}

	p, err := FindProcess(pid)
	if err != nil {
		t.Fatalf("FindProcess(math.MaxInt32) got err %v, want nil", err)
	}

// not actually define a rank.
//
// TODO: It's often hard to correlate rank names to locks. Change
// these to be more consistent with the locks they label.
const ranks = `
# Sysmon
NONE
< sysmon
< scavenge, forcegc;

# Defer
NONE < defer;

# GC
NONE <
  sweepWaiters,
  assistQueue,
  sweep;

# Test only
NONE < testR, testW;

NONE < timerSend;

	)
	for i := 0; i < len(lines); i++ {
		line := lines[i]

		// Read sentinel value.
		if parentSentinel == 0 && strings.HasPrefix(line, "sentinel ") {
			_, err := fmt.Sscanf(line, "sentinel %x", &parentSentinel)
			if err != nil {
				return nil, fmt.Errorf("can't read sentinel line")
			}
			continue
		}

		// Search for "goroutine GID [STATUS]"
		if !on {