* Returns the newly refreshed value associated with {@code key} if it was refreshed inline, or
     * {@code null} if another thread is performing the refresh or if an error occurs during
     * refresh.
     */
    @CanIgnoreReturnValue
    @CheckForNull
    V refresh(K key, int hash, CacheLoader<? super K, V> loader, boolean checkTime) {
      final LoadingValueReference<K, V> loadingValueReference =

     * Returns the newly refreshed value associated with {@code key} if it was refreshed inline, or
     * {@code null} if another thread is performing the refresh or if an error occurs during
     * refresh.
     */
    @CanIgnoreReturnValue
    @CheckForNull
    V refresh(K key, int hash, CacheLoader<? super K, V> loader, boolean checkTime) {
      final LoadingValueReference<K, V> loadingValueReference =

* Update cluster-proportional-autoscaler, etcd-empty-dir-cleanup, fluentd-gcp, and kube-addon-manager addons with refreshed base images containing fixes for CVE-2015-8271, CVE-2016-7543, CVE-2016-9841, CVE-2016-9843, CVE-2017-1000366, CVE-2017-2616, and CVE-2017-7507. ([#48011](https://github.com/kubernetes/kubernetes/pull/48011), [@ixdy](https://github.com/ixdy))

	housekeepingWarningDuration = time.Second * 1

	// Period after which the runtime cache expires - set to slightly longer than
	// the expected length between housekeeping periods, which explicitly refreshes
	// the cache.
	runtimeCacheRefreshPeriod = housekeepingPeriod + housekeepingWarningDuration

	// Period for performing eviction monitoring.
	// ensure this is kept in sync with internal cadvisor housekeeping.

	// It's important not to try to handle a signal between those two steps.
	sigmask := mp.sigmask
	sigblock(false)
	unminit()

	setg(nil)

	// Clear g0 stack bounds to ensure that needm always refreshes the
	// bounds when reusing this M.
	g0 := mp.g0
	g0.stack.hi = 0
	g0.stack.lo = 0
	g0.stackguard0 = 0
	g0.stackguard1 = 0

	putExtraM(mp)

	msigrestore(sigmask)
}