array_flip problem after module install

Yes, definitely. I got this error during simple using the field API in an own module with no other 3rd Party modules installed and minimal fresh installation. Exactly when I try to deinstall the module. I use the Image Field in this module, what uses the file field.

Is there a patch available for this issue or will coming an update for Drupal?

It's not the cache system, it's the file field API.

I got this error during simple using the field API in an own module with no other 3rd Party modules installed and minimal fresh installation.

Exactly when I try to deinstall the module. I use the Image Field in this module, what uses the file field.

Steps for reproduction:

1. Doing a fresh minimal installation of Drupal 7 and enable the image module (and file of course).
2. Install a module what is using the field API (especially an File Field).
3. Deinstall the module again.

" field API in an own module"

If you are using a custom module, then please provide the code so that people can reproduce the issue.

Of course, sorry for my mistake. Here's my code from the .install file.

function mx_product_install() {

	node_types_rebuild();
	$types = node_type_get_types();

	foreach (_mx_product_field_definitions() as $field) {
		field_create_field($field);
	}

	foreach (_mx_product_field_instances() as $instance) {
		$instance['entity_type'] = 'node';
		$instance['bundle'] = 'mx_product';
		field_create_instance($instance);
	}

}


function mx_product_uninstall() {

	$nids = array();
	$result = db_query("SELECT nid FROM {node} WHERE type = :type", array(':type' => 'mx_product'));
	foreach ($result as $nid) {
		$nids[] = $nid;
	}
	node_delete_multiple($nids);

	foreach (array_keys(_mx_product_field_definitions()) as $field_name) {
		field_delete_field($field_name);
	}

	foreach (field_info_instances('node', 'mx_product') as $instance_name => $instance) {
		field_delete_instance($instance);
	}

	node_type_delete('mx_product');

	field_purge_batch(1000);

}


/**
 * Gibt ein strukturiertes Array mit Fielddefinitionen für den Inhaltstyp "MX Product" zurück.
 * @return array
 */
function _mx_product_field_definitions() {
	return array(
//		'mx_product_packshot' => array(
//			'field_name' => 'mx_product_packshot',
//			'type' => 'image',
//			'locked' => true,
//		),
		'mx_product_country' => array(
			'field_name' => 'mx_product_country',
			'type' => 'text',
			'locked' => true,
		),
	);
}

/**
 * Gibt ein strukturiertes Array mit Fieldinstances für den Inhaltstyp "MX Product" zurück.
 *  @return array
 */
function _mx_product_field_instances() {
	return array(
//		array(
//			'field_name' => 'mx_product_packshot',
//			'label' => 'Packshot für das Produkt',
//			'description' => 'Falls verfügbar, kann hier ein Packshot des Produktes hinterlegt werden.',
//			'settings' => array(
//				'file_directory' => 'mx_product/packshot',
//			),
//		),

		array(
			'field_name' => 'mx_product_country',
			'label' => 'Land',
			'description' => 'Land, für das das Produkt erstellt wurde.',
			'required' => true,
		),
	);
}

This code works without problems. Uncomment the image field definition and you have this problem during uninstall.

With 17 releases since this issue was opened, and no more activity, I'm guessing the problem has actually been solved one way or the other.