FileStorage: infinite wait when exception is thrown in fallback callback and called again

[janedbal]

Following code leads to infinite wait on file lock here. Maybe there should be some global Exception handler with unlock?

$fn = function () use ($cache) {
    $cache->load('key', function () {
        throw new Exception;
    });
};

try {
    $fn();
} catch (Exception $e) {
    $fn();
}

[janedbal]

@dg Thank you