Cannot connect external storage SMB/CIFS after update to NC 15.0.5

[bambita]

I cannot connect external storage SMB/CIFS

Steps to reproduce

1. Open administration page (/settings/admin/externalstorages)
2. Click on recheck button (on previously working storage configuration) which calls /apps/files_external/globalstorages/14?testOnly=true
3. In GUI I am getting red exclamation mark, in browser console I can see net::ERR_EMPTY_RESPONSE

Expected behaviour

Connected and working external storage.

Actual behaviour

In GUI I am getting red exclamation mark, in browser console I can see net::ERR_EMPTY_RESPONSE

Server configuration

**Operating system: Linux raspberrypi 4.14.98-v7+

**Web server: Apache/2.4.25 (Raspbian)

**Database: mysql Ver 15.1 Distrib 10.1.37-MariaDB, for debian-linux-gnueabihf (armv8l) using readline 5.2

**PHP version: PHP 7.0.33-0+deb9u3

**Nextcloud version: 15.0.5

**Updated from an older Nextcloud/ownCloud or fresh install:updated from 15.0.4

**Where did you install Nextcloud from: auto update from Web GUI

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

Enabled:
  - activity: 2.8.2
  - cloud_federation_api: 0.1.0
  - comments: 1.5.0
  - dav: 1.8.1
  - federatedfilesharing: 1.5.0
  - federation: 1.5.0
  - files: 1.10.0
  - files_external: 1.6.0
  - files_pdfviewer: 1.4.0
  - files_sharing: 1.7.0
  - files_texteditor: 2.7.0
  - files_trashbin: 1.5.0
  - files_versions: 1.8.0
  - files_videoplayer: 1.4.0
  - firstrunwizard: 2.4.0
  - gallery: 18.2.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.3.0
  - nextcloud_announcements: 1.4.0
  - notifications: 2.3.0
  - oauth2: 1.3.0
  - password_policy: 1.5.0
  - previewgenerator: 2.1.0
  - provisioning_api: 1.5.0
  - serverinfo: 1.5.0
  - sharebymail: 1.5.0
  - support: 1.0.0
  - theming: 1.6.0
  - twofactor_backupcodes: 1.4.1
  - updatenotification: 1.5.0
  - workflowengine: 1.5.0
Disabled:
  - accessibility
  - admin_audit
  - encryption
  - survey_client
  - systemtags
  - user_ldap

Nextcloud configuration:

Config report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.mydomain.cz"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/cloud.mydomain.cz",
        "dbtype": "mysql",
        "version": "15.0.5.3",
        "installed": true,
        "maintenance": false,
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "htaccess.RewriteBase": "\/",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "theme": "",
        "loglevel": 2,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***"
    }
}

**Are you using external storage, if yes which one: Yes, SMB on local network

**Are you using encryption: no

**Are you using an external user-backend, if yes which one: no

LDAP configuration (delete this part if not used)

LDAP config

N/A

Client configuration

**Browser:Latest chrome or firefox

**Operating system: Windows 10

Logs

Web server error log

Web server error log

[Sun Mar 17 10:26:22.748578 2019] [authz_core:error] [pid 1755] [client 192.168.1.157:49733] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:26:23.799424 2019] [core:notice] [pid 909] AH00052: child pid 1808 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:14.002651 2019] [authz_core:error] [pid 1864] [client 192.168.1.157:50198] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:34:15.277350 2019] [core:notice] [pid 909] AH00052: child pid 1866 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:17.718536 2019] [authz_core:error] [pid 1868] [client 192.168.1.157:50201] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:34:18.280791 2019] [core:notice] [pid 909] AH00052: child pid 1864 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:19.282006 2019] [core:notice] [pid 909] AH00052: child pid 1815 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:20.283193 2019] [core:notice] [pid 909] AH00052: child pid 1806 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:20.283330 2019] [core:notice] [pid 909] AH00052: child pid 1868 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:20.283409 2019] [core:notice] [pid 909] AH00052: child pid 1869 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:26.080549 2019] [authz_core:error] [pid 1912] [client 192.168.1.157:50217] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:34:27.303469 2019] [core:notice] [pid 909] AH00052: child pid 1755 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:28.322062 2019] [core:notice] [pid 909] AH00052: child pid 1814 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:28.322260 2019] [core:notice] [pid 909] AH00052: child pid 1908 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:28.322309 2019] [core:notice] [pid 909] AH00052: child pid 1912 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:28.322354 2019] [core:notice] [pid 909] AH00052: child pid 1913 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:29.323502 2019] [core:notice] [pid 909] AH00052: child pid 1813 exit signal Segmentation fault (11)
[Sun Mar 17 10:34:29.323748 2019] [core:notice] [pid 909] AH00052: child pid 1867 exit signal Segmentation fault (11)
[Sun Mar 17 10:36:38.916075 2019] [authz_core:error] [pid 1925] [client 192.168.1.157:50346] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:36:40.462473 2019] [core:notice] [pid 909] AH00052: child pid 1922 exit signal Segmentation fault (11)
[Sun Mar 17 10:36:53.500694 2019] [core:notice] [pid 909] AH00052: child pid 1935 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:04.817821 2019] [authz_core:error] [pid 1923] [client 192.168.1.157:50377] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:37:05.519828 2019] [core:notice] [pid 909] AH00052: child pid 1921 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:06.531121 2019] [core:notice] [pid 909] AH00052: child pid 1918 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:06.531377 2019] [core:notice] [pid 909] AH00052: child pid 1923 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:06.531438 2019] [core:notice] [pid 909] AH00052: child pid 1926 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:07.532598 2019] [core:notice] [pid 909] AH00052: child pid 1933 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:08.248638 2019] [authz_core:error] [pid 1936] [client 192.168.1.157:50381] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:37:09.549028 2019] [core:notice] [pid 909] AH00052: child pid 1924 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:19.332312 2019] [authz_core:error] [pid 1925] [client 192.168.1.157:50401] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:37:20.597243 2019] [core:notice] [pid 909] AH00052: child pid 1944 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:20.597522 2019] [core:notice] [pid 909] AH00052: child pid 1953 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:20.597582 2019] [core:notice] [pid 909] AH00052: child pid 1954 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:21.598702 2019] [core:notice] [pid 909] AH00052: child pid 1934 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:22.599940 2019] [core:notice] [pid 909] AH00052: child pid 1925 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:22.600071 2019] [core:notice] [pid 909] AH00052: child pid 1952 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:22.600112 2019] [core:notice] [pid 909] AH00052: child pid 1955 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:23.601264 2019] [core:notice] [pid 909] AH00052: child pid 1945 exit signal Segmentation fault (11)
[Sun Mar 17 10:37:25.247097 2019] [authz_core:error] [pid 1962] [client 192.168.1.157:50416] AH01630: client denied by server configuration: /var/www/cloud.mydomain.cz/data/.ocdata
[Sun Mar 17 10:37:26.640700 2019] [core:notice] [pid 909] AH00052: child pid 1960 exit signal Segmentation fault (11)

Nextcloud log (data/nextcloud.log)

Nextcloud log

{
	"reqId": "XLpN8yulfXC26dCnHMhU",
	"level": 3,
	"time": "2019-03-17T09:16:27+00:00",
	"remoteAddr": "",
	"user": "--",
	"app": "core",
	"method": "",
	"url": "--",
	"message": {
		"Exception": "Doctrine\\DBAL\\Exception\\DriverException",
		"Message": "An exception occurred while executing 'SELECT * FROM `oc_calendar_resources`':\n\nSQLSTATE[HY000]: General error: 1712 Index oc_calendar_resources is corrupted",
		"Code": 0,
		"Trace": [{
				"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/DBALException.php",
				"line": 128,
				"function": "convertException",
				"class": "Doctrine\\DBAL\\Driver\\AbstractMySQLDriver",
				"type": "->",
				"args": ["An exception occurred while executing 'SELECT * FROM `oc_calendar_resources`':\n\nSQLSTATE[HY000]: General error: 1712 Index oc_calendar_resources is corrupted", {
						"errorInfo": ["HY000", 1712, "Index oc_calendar_resources is corrupted"],
						"__class__": "Doctrine\\DBAL\\Driver\\PDOException"
					}
				]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Connection.php",
				"line": 855,
				"function": "driverExceptionDuringQuery",
				"class": "Doctrine\\DBAL\\DBALException",
				"type": "::",
				"args": [{
						"__class__": "Doctrine\\DBAL\\Driver\\PDOMySql\\Driver"
					}, {
						"errorInfo": ["HY000", 1712, "Index oc_calendar_resources is corrupted"],
						"__class__": "Doctrine\\DBAL\\Driver\\PDOException"
					}, "SELECT * FROM `oc_calendar_resources`", []]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/Connection.php",
				"line": 195,
				"function": "executeQuery",
				"class": "Doctrine\\DBAL\\Connection",
				"type": "->",
				"args": ["SELECT * FROM `oc_calendar_resources`", [], [], null]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Query\/QueryBuilder.php",
				"line": 206,
				"function": "executeQuery",
				"class": "OC\\DB\\Connection",
				"type": "->",
				"args": ["SELECT * FROM `oc_calendar_resources`", [], []]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/QueryBuilder\/QueryBuilder.php",
				"line": 214,
				"function": "execute",
				"class": "Doctrine\\DBAL\\Query\\QueryBuilder",
				"type": "->",
				"args": []
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
				"line": 206,
				"function": "execute",
				"class": "OC\\DB\\QueryBuilder\\QueryBuilder",
				"type": "->",
				"args": []
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
				"line": 97,
				"function": "getCached",
				"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
				"type": "->",
				"args": ["calendar_resources"]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
				"line": 88,
				"function": "runResources",
				"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
				"type": "->",
				"args": []
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/Job.php",
				"line": 61,
				"function": "run",
				"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
				"type": "->",
				"args": [null]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/TimedJob.php",
				"line": 55,
				"function": "execute",
				"class": "OC\\BackgroundJob\\Job",
				"type": "->",
				"args": [{
						"__class__": "OC\\BackgroundJob\\JobList"
					}, {
						"__class__": "OC\\Log"
					}
				]
			}, {
				"file": "\/var\/www\/cloud.mydomain.cz\/cron.php",
				"line": 123,
				"function": "execute",
				"class": "OC\\BackgroundJob\\TimedJob",
				"type": "->",
				"args": [{
						"__class__": "OC\\BackgroundJob\\JobList"
					}, {
						"__class__": "OC\\Log"
					}
				]
			}
		],
		"File": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Driver\/AbstractMySQLDriver.php",
		"Line": 115,
		"Previous": {
			"Exception": "Doctrine\\DBAL\\Driver\\PDOException",
			"Message": "SQLSTATE[HY000]: General error: 1712 Index oc_calendar_resources is corrupted",
			"Code": "HY000",
			"Trace": [{
					"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Connection.php",
					"line": 852,
					"function": "query",
					"class": "Doctrine\\DBAL\\Driver\\PDOConnection",
					"type": "->",
					"args": ["SELECT * FROM `oc_calendar_resources`"]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/Connection.php",
					"line": 195,
					"function": "executeQuery",
					"class": "Doctrine\\DBAL\\Connection",
					"type": "->",
					"args": ["SELECT * FROM `oc_calendar_resources`", [], [], null]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Query\/QueryBuilder.php",
					"line": 206,
					"function": "executeQuery",
					"class": "OC\\DB\\Connection",
					"type": "->",
					"args": ["SELECT * FROM `oc_calendar_resources`", [], []]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/QueryBuilder\/QueryBuilder.php",
					"line": 214,
					"function": "execute",
					"class": "Doctrine\\DBAL\\Query\\QueryBuilder",
					"type": "->",
					"args": []
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
					"line": 206,
					"function": "execute",
					"class": "OC\\DB\\QueryBuilder\\QueryBuilder",
					"type": "->",
					"args": []
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
					"line": 97,
					"function": "getCached",
					"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
					"type": "->",
					"args": ["calendar_resources"]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
					"line": 88,
					"function": "runResources",
					"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
					"type": "->",
					"args": []
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/Job.php",
					"line": 61,
					"function": "run",
					"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
					"type": "->",
					"args": [null]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/TimedJob.php",
					"line": 55,
					"function": "execute",
					"class": "OC\\BackgroundJob\\Job",
					"type": "->",
					"args": [{
							"__class__": "OC\\BackgroundJob\\JobList"
						}, {
							"__class__": "OC\\Log"
						}
					]
				}, {
					"file": "\/var\/www\/cloud.mydomain.cz\/cron.php",
					"line": 123,
					"function": "execute",
					"class": "OC\\BackgroundJob\\TimedJob",
					"type": "->",
					"args": [{
							"__class__": "OC\\BackgroundJob\\JobList"
						}, {
							"__class__": "OC\\Log"
						}
					]
				}
			],
			"File": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Driver\/PDOConnection.php",
			"Line": 106,
			"Previous": {
				"Exception": "PDOException",
				"Message": "SQLSTATE[HY000]: General error: 1712 Index oc_calendar_resources is corrupted",
				"Code": "HY000",
				"Trace": [{
						"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Driver\/PDOConnection.php",
						"line": 104,
						"function": "query",
						"class": "PDO",
						"type": "->",
						"args": ["SELECT * FROM `oc_calendar_resources`"]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Connection.php",
						"line": 852,
						"function": "query",
						"class": "Doctrine\\DBAL\\Driver\\PDOConnection",
						"type": "->",
						"args": ["SELECT * FROM `oc_calendar_resources`"]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/Connection.php",
						"line": 195,
						"function": "executeQuery",
						"class": "Doctrine\\DBAL\\Connection",
						"type": "->",
						"args": ["SELECT * FROM `oc_calendar_resources`", [], [], null]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Query\/QueryBuilder.php",
						"line": 206,
						"function": "executeQuery",
						"class": "OC\\DB\\Connection",
						"type": "->",
						"args": ["SELECT * FROM `oc_calendar_resources`", [], []]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/DB\/QueryBuilder\/QueryBuilder.php",
						"line": 214,
						"function": "execute",
						"class": "Doctrine\\DBAL\\Query\\QueryBuilder",
						"type": "->",
						"args": []
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
						"line": 206,
						"function": "execute",
						"class": "OC\\DB\\QueryBuilder\\QueryBuilder",
						"type": "->",
						"args": []
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
						"line": 97,
						"function": "getCached",
						"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
						"type": "->",
						"args": ["calendar_resources"]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/apps\/dav\/lib\/BackgroundJob\/UpdateCalendarResourcesRoomsBackgroundJob.php",
						"line": 88,
						"function": "runResources",
						"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
						"type": "->",
						"args": []
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/Job.php",
						"line": 61,
						"function": "run",
						"class": "OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob",
						"type": "->",
						"args": [null]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/lib\/private\/BackgroundJob\/TimedJob.php",
						"line": 55,
						"function": "execute",
						"class": "OC\\BackgroundJob\\Job",
						"type": "->",
						"args": [{
								"__class__": "OC\\BackgroundJob\\JobList"
							}, {
								"__class__": "OC\\Log"
							}
						]
					}, {
						"file": "\/var\/www\/cloud.mydomain.cz\/cron.php",
						"line": 123,
						"function": "execute",
						"class": "OC\\BackgroundJob\\TimedJob",
						"type": "->",
						"args": [{
								"__class__": "OC\\BackgroundJob\\JobList"
							}, {
								"__class__": "OC\\Log"
							}
						]
					}
				],
				"File": "\/var\/www\/cloud.mydomain.cz\/3rdparty\/doctrine\/dbal\/lib\/Doctrine\/DBAL\/Driver\/PDOConnection.php",
				"Line": 104
			}
		},
		"CustomMessage": "Error while running background job (class: OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob, arguments: )"
	},
	"userAgent": "--",
	"version": "15.0.5.3"
}

Browser log

Browser log

core.js?v=e554434a-4:7 JQMIGRATE: Migrate is installed, version 1.4.0
content.js:94 Content Server Web Browser Extension: not applicable for href='https://cloud.mydomain.cz/settings/admin/externalstorages'; 
/remote.php/webdav:1 Failed to load resource: net::ERR_EMPTY_RESPONSE
/apps/files_external/globalstorages/14?testOnly=true:1 Failed to load resource: net::ERR_EMPTY_RESPONSE
DevTools failed to parse SourceMap: https://cloud.mydomain.cz/apps/notifications/js/notifications.js.map

[kesselb]

Hmm. You have a few issues with your setup:

1. General error: 1712 Index oc_calendar_resources is corrupted

I would try to recreate the indexes for table calendar_resources.

server/apps/dav/lib/Migration/Version1005Date20180530124431.php

Lines 76 to 78 in b7de6d7

	$table->addIndex(['backend_id', 'resource_id'], 'calendar_' . $type . '_bkdrsc');
	$table->addIndex(['email'], 'calendar_' . $type . '_email');
	$table->addIndex(['displayname'], 'calendar_' . $type . '_name');

2. [Sun Mar 17 10:34:18.280791 2019] [core:notice] [pid 909] AH00052: child pid 1864 exit signal Segmentation fault (11)

Check your apache2 and/or php-fpm error logs. Something is wrong ;)

[bambita]

Thanks. You can close the case. Issue was in Apache. It was upgraded from 2.2 to 2.4. Some adjustment was needed...

https://wiki.apache.org/httpd/ClientDeniedByServerConfiguration