* Image GC logic should compensate for reserved blocks ([#27996](https://github.com/kubernetes/kubernetes/pull/27996), [@ronnielai](https://github.com/ronnielai))
* Bump minimum API version for docker to 1.21 ([#27208](https://github.com/kubernetes/kubernetes/pull/27208), [@yujuhong](https://github.com/yujuhong))

		dst.Code = dsync.RespErr
		dst.Err = err.Error()
	}
	return dst, nil
}

const (
	// Lock maintenance interval.
	lockMaintenanceInterval = 1 * time.Minute

	// Lock validity duration
	lockValidityDuration = 1 * time.Minute
)

// lockMaintenance loops over all locks and discards locks
// that have not been refreshed for some time.
func lockMaintenance(ctx context.Context) {

### Locks

We have 3 different things that we synchronize on.

#### Http2Connection

This lock guards internal state of each connection. This lock is never held for blocking operations. That means that we acquire the lock, read or write a few fields and release the lock. No I/O and no application-layer callbacks.

#### Http2Stream

Harshavardhana <******@****.***> 1622584780 -0700

pkg syscall (freebsd-arm64), type Stat_t struct, Birthtimespec Timespec
pkg syscall (freebsd-arm64), type Stat_t struct, Blksize int32
pkg syscall (freebsd-arm64), type Stat_t struct, Blocks int64
pkg syscall (freebsd-arm64), type Stat_t struct, Ctimespec Timespec
pkg syscall (freebsd-arm64), type Stat_t struct, Dev uint64
pkg syscall (freebsd-arm64), type Stat_t struct, Flags uint32

pkg syscall (darwin-arm64), type Stat_t struct, Birthtimespec Timespec
pkg syscall (darwin-arm64), type Stat_t struct, Blksize int32
pkg syscall (darwin-arm64), type Stat_t struct, Blocks int64
pkg syscall (darwin-arm64), type Stat_t struct, Ctimespec Timespec
pkg syscall (darwin-arm64), type Stat_t struct, Dev int32
pkg syscall (darwin-arm64), type Stat_t struct, Flags uint32

pkg syscall (freebsd-riscv64), type Stat_t struct, Birthtimespec Timespec #53466
pkg syscall (freebsd-riscv64), type Stat_t struct, Blksize int32 #53466
pkg syscall (freebsd-riscv64), type Stat_t struct, Blocks int64 #53466
pkg syscall (freebsd-riscv64), type Stat_t struct, Ctimespec Timespec #53466
pkg syscall (freebsd-riscv64), type Stat_t struct, Dev uint64 #53466

    @Deprecated
    void setBlacklisted(boolean blackListed);

    /**
     * @return whether the repository is blocked
     * @since 3.8.1
     **/
    boolean isBlocked();

    /**
     * @param blocked block the repository?
     * @since 3.8.1
     **/
    void setBlocked(boolean blocked);

    //
    // New interface methods for the repository system.
    //
    /**
     *

   * Queue<E> queue = Queues.synchronizedQueue(MinMaxPriorityQueue.<E>create());
   * ...
   * queue.add(element);  // Needn't be in synchronized block
   * ...
   * synchronized (queue) {  // Must synchronize on queue!
   *   Iterator<E> i = queue.iterator(); // Must be in synchronized block
   *   while (i.hasNext()) {
   *     foo(i.next());
   *   }
   * }
   * }
   *

        // Verify that attempting to change timezone returns the same instance
        Clock newClock = clock.withZone(ZoneId.systemDefault());
        assertSame(clock, newClock, "withZone() should return the same clock instance");
    }

    @Test
    @DisplayName("MonotonicClock should maintain monotonic time progression")
    void testMonotonicBehavior() throws InterruptedException {