deadlocks in oc_calendarchanges when importing events

[flokli]

Steps to reproduce

1. Set up nextcloud, enable calendar app. I used MySQL as database, without memcache and without redis
2. From the calendar view, import some events from ics via Settings & Import -> Import calendar

Expected behaviour

Nextcloud should be able to import events

Actual behaviour

A lot of events failed to import. Logs show some deadlocks occured.

Server configuration

Operating system: NixOS 18.09

Web server: nginx 1.14.1

Database: mariadb-10.2.17

PHP version: php 7.1.24

Nextcloud version: 14.0.4

Updated from an older Nextcloud/ownCloud or fresh install: updated from 14.0.3

Where did you install Nextcloud from: https://github.com/NixOS/nixpkgs/blob/ee1613aea656119a872c3e75334e8469c27fff44/pkgs/servers/nextcloud/default.nix

Signing status:

Signing status

Technical information
=====================
The following list covers which files have failed the integrity check. Please read
the previous linked documentation to learn more about the errors and how to fix
them.

Results
=======
- core
	- INVALID_HASH
		- lib/private/Mail/Mailer.php

Raw output
==========
Array
(
 [core] => Array
 (
 [INVALID_HASH] => Array
 (
 [lib/private/Mail/Mailer.php] => Array
 (
 [expected] => 14863a04a8a9c5ce1ba56a415609a6ef0ecae27810ce7fa1d654f211d7f6c3eb882a022e7053db91e5c2bce2c6de2d4a19289383f7aeacab7686b7af34b1de32
 [current] => 7ccb23725eabf13e31efe8fc040e4bf49d47563519c8f1a22e9d7a12a8de1f721cce88e3e1eea20f72b74e8a910e80564007192860d41b6645a01222d846aaf6
 )

 )

 )

)

This is expected, we apply https://github.com/nextcloud/server/pull/11404.patch to fix sendmail, which is not backported to 14, but will be shipped in nextcloud 15.

List of activated apps:

App list

Enabled:
 - accessibility: 1.0.1
 - activity: 2.7.0
 - calendar: 1.6.4
 - cloud_federation_api: 0.0.1
 - comments: 1.4.0
 - contacts: 2.1.8
 - dav: 1.6.0
 - federatedfilesharing: 1.4.0
 - federation: 1.4.0
 - files: 1.9.0
 - files_pdfviewer: 1.3.2
 - files_sharing: 1.6.2
 - files_texteditor: 2.6.0
 - files_trashbin: 1.4.1
 - files_versions: 1.7.1
 - files_videoplayer: 1.3.0
 - firstrunwizard: 2.3.0
 - gallery: 18.1.0
 - logreader: 2.0.0
 - lookup_server_connector: 1.2.0
 - nextcloud_announcements: 1.3.0
 - notifications: 2.2.1
 - oauth2: 1.2.1
 - password_policy: 1.4.0
 - provisioning_api: 1.4.0
 - serverinfo: 1.4.0
 - sharebymail: 1.4.0
 - support: 1.0.0
 - survey_client: 1.2.0
 - systemtags: 1.4.0
 - theming: 1.5.0
 - twofactor_backupcodes: 1.3.1
 - updatenotification: 1.4.1
 - workflowengine: 1.4.0
Disabled:
 - admin_audit
 - encryption
 - files_external
 - user_external
 - user_ldap

Nextcloud configuration:

Config report

{
 "system": {
 "apps_paths": [
 {
 "path": "\/var\/lib\/nextcloud\/apps",
 "url": "\/apps",
 "writable": false
 },
 {
 "path": "\/var\/lib\/nextcloud\/store-apps",
 "url": "\/store-apps",
 "writable": true
 }
 ],
 "datadirectory": "***REMOVED SENSITIVE VALUE***",
 "skeletondirectory": "",
 "memcache.local": "\\OC\\Memcache\\APCu",
 "log_type": "syslog",
 "passwordsalt": "***REMOVED SENSITIVE VALUE***",
 "secret": "***REMOVED SENSITIVE VALUE***",
 "dbtype": "mysql",
 "version": "14.0.4.2",
 "overwrite.cli.url": "http:\/\/localhost",
 "dbname": "***REMOVED SENSITIVE VALUE***",
 "dbhost": "***REMOVED SENSITIVE VALUE***",
 "dbport": "",
 "dbtableprefix": "oc_",
 "mysql.utf8mb4": true,
 "dbuser": "***REMOVED SENSITIVE VALUE***",
 "dbpassword": "***REMOVED SENSITIVE VALUE***",
 "installed": true,
 "instanceid": "***REMOVED SENSITIVE VALUE***",
 "loglevel": 2,
 "maintenance": false,
 "trusted_domains": [
 "***REMOVED SENSITIVE VALUE***"
 ]
 }
}

Are you using external storage, if yes which one: local/smb/sftp/... no

Are you using encryption: yes/no no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/... no

Client configuration

Browser: Google Chrome 70

Operating system: NixOS 18.09

Logs

Web server error log

Web server error log

Nextcloud log (data/nextcloud.log)

Nextcloud log

{
 "Exception": "Doctrine\\DBAL\\Exception\\DriverException",
 "Message": "An exception occurred while executing 'INSERT INTO `oc_calendarchanges` (`uri`, `synctoken`, `calendarid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `oc_calendars` WHERE `id` = ?' with params [\"Nextcloud-C2FREY26K7OGRSMWFEJ52.ics\", \"3\", 1, \"3\"]:\n\nSQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction",
 "Code": 0,
 "Trace": [
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php",
 "line": 128,
 "function": "convertException",
 "class": "Doctrine\\DBAL\\Driver\\AbstractMySQLDriver",
 "type": "->",
 "args": [
 "An exception occurred while executing 'INSERT INTO `oc_calendarchanges` (`uri`, `synctoken`, `calendarid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `oc_calendars` WHERE `id` = ?' with params [\"Nextcloud-C2FREY26K7OGRSMWFEJ52.ics\", \"3\", 1, \"3\"]:\n\nSQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction",
 {
 "errorInfo": [
 "40001",
 1213,
 "Deadlock found when trying to get lock; try restarting transaction"
 ],
 "__class__": "Doctrine\\DBAL\\Driver\\PDOException"
 }
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Statement.php",
 "line": 177,
 "function": "driverExceptionDuringQuery",
 "class": "Doctrine\\DBAL\\DBALException",
 "type": "::",
 "args": [
 {
 "__class__": "Doctrine\\DBAL\\Driver\\PDOMySql\\Driver"
 },
 {
 "errorInfo": [
 "40001",
 1213,
 "Deadlock found when trying to get lock; try restarting transaction"
 ],
 "__class__": "Doctrine\\DBAL\\Driver\\PDOException"
 },
 "INSERT INTO `oc_calendarchanges` (`uri`, `synctoken`, `calendarid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `oc_calendars` WHERE `id` = ?",
 {
 "1": "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "2": "3",
 "3": 1,
 "4": "3"
 }
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 2013,
 "function": "execute",
 "class": "Doctrine\\DBAL\\Statement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 1020,
 "function": "addChange",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 1
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/CalDAV/Calendar.php",
 "line": 201,
 "function": "createCalendarObject",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 1096,
 "function": "createFile",
 "class": "Sabre\\CalDAV\\Calendar",
 "type": "->",
 "args": [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",
 "line": 529,
 "function": "createFile",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 "calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR",
 null
 ]
 },
 {
 "function": "httpPut",
 "class": "Sabre\\DAV\\CorePlugin",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/event/lib/EventEmitterTrait.php",
 "line": 105,
 "function": "call_user_func_array",
 "args": [
 [
 {
 "__class__": "Sabre\\DAV\\CorePlugin"
 },
 "httpPut"
 ],
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 479,
 "function": "emit",
 "class": "Sabre\\Event\\EventEmitter",
 "type": "->",
 "args": [
 "method:PUT",
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 254,
 "function": "invokeMethod",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/Server.php",
 "line": 293,
 "function": "exec",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php",
 "line": 35,
 "function": "exec",
 "class": "OCA\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/remote.php",
 "line": 163,
 "args": [
 "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php"
 ],
 "function": "require_once"
 }
 ],
 "File": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php",
 "Line": 115,
 "Previous": {
 "Exception": "Doctrine\\DBAL\\Driver\\PDOException",
 "Message": "SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction",
 "Code": "40001",
 "Trace": [
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Statement.php",
 "line": 168,
 "function": "execute",
 "class": "Doctrine\\DBAL\\Driver\\PDOStatement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 2013,
 "function": "execute",
 "class": "Doctrine\\DBAL\\Statement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 1020,
 "function": "addChange",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 1
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/CalDAV/Calendar.php",
 "line": 201,
 "function": "createCalendarObject",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 1096,
 "function": "createFile",
 "class": "Sabre\\CalDAV\\Calendar",
 "type": "->",
 "args": [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",
 "line": 529,
 "function": "createFile",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 "calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR",
 null
 ]
 },
 {
 "function": "httpPut",
 "class": "Sabre\\DAV\\CorePlugin",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/event/lib/EventEmitterTrait.php",
 "line": 105,
 "function": "call_user_func_array",
 "args": [
 [
 {
 "__class__": "Sabre\\DAV\\CorePlugin"
 },
 "httpPut"
 ],
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 479,
 "function": "emit",
 "class": "Sabre\\Event\\EventEmitter",
 "type": "->",
 "args": [
 "method:PUT",
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 254,
 "function": "invokeMethod",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/Server.php",
 "line": 293,
 "function": "exec",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php",
 "line": 35,
 "function": "exec",
 "class": "OCA\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/remote.php",
 "line": 163,
 "args": [
 "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php"
 ],
 "function": "require_once"
 }
 ],
 "File": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php",
 "Line": 107,
 "Previous": {
 "Exception": "PDOException",
 "Message": "SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction",
 "Code": "40001",
 "Trace": [
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php",
 "line": 105,
 "function": "execute",
 "class": "PDOStatement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Statement.php",
 "line": 168,
 "function": "execute",
 "class": "Doctrine\\DBAL\\Driver\\PDOStatement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 2013,
 "function": "execute",
 "class": "Doctrine\\DBAL\\Statement",
 "type": "->",
 "args": [
 [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "3",
 1,
 "3"
 ]
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/CalDAV/CalDavBackend.php",
 "line": 1020,
 "function": "addChange",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 1
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/CalDAV/Calendar.php",
 "line": 201,
 "function": "createCalendarObject",
 "class": "OCA\\DAV\\CalDAV\\CalDavBackend",
 "type": "->",
 "args": [
 "3",
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 1096,
 "function": "createFile",
 "class": "Sabre\\CalDAV\\Calendar",
 "type": "->",
 "args": [
 "Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR"
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",
 "line": 529,
 "function": "createFile",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 "calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "BEGIN:VCALENDAR\r\n[...]\r\nEND:VCALENDAR",
 null
 ]
 },
 {
 "function": "httpPut",
 "class": "Sabre\\DAV\\CorePlugin",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/event/lib/EventEmitterTrait.php",
 "line": 105,
 "function": "call_user_func_array",
 "args": [
 [
 {
 "__class__": "Sabre\\DAV\\CorePlugin"
 },
 "httpPut"
 ],
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 479,
 "function": "emit",
 "class": "Sabre\\Event\\EventEmitter",
 "type": "->",
 "args": [
 "method:PUT",
 [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 ]
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/sabre/dav/lib/DAV/Server.php",
 "line": 254,
 "function": "invokeMethod",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": [
 {
 "absoluteUrl": "https://nextcloud/remote.php/dav/calendars/testuser/personal/Nextcloud-C2FREY26K7OGRSMWFEJ52.ics",
 "__class__": "Sabre\\HTTP\\Request"
 },
 {
 "__class__": "Sabre\\HTTP\\Response"
 }
 ]
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/lib/Server.php",
 "line": 293,
 "function": "exec",
 "class": "Sabre\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php",
 "line": 35,
 "function": "exec",
 "class": "OCA\\DAV\\Server",
 "type": "->",
 "args": []
 },
 {
 "file": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/remote.php",
 "line": 163,
 "args": [
 "/nix/store/x9i6jp7d0lmydnxhv3csbklrx93y3pci-nextcloud-14.0.3/apps/dav/appinfo/v2/remote.php"
 ],
 "function": "require_once"
 }
 ],
 "File": "/nix/store/h5csnfawxc73w0c0ls41fmj32cmjw2fi-nextcloud-14.0.4/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php",
 "Line": 105
 }
 },
 "CustomMessage": "--"
}

Browser log

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

I stripped the VCARD payload and json-formatted the log entry.

Might be related to #12413.

[flokli]

cc @MorrisJobke

[MorrisJobke]

cc @georgehrke @tcitworld for the calendar import

[georgehrke]

There is this ticket in the calendar repo about limiting the number of import requests at a time: nextcloud/calendar#445 (already fixed in alpha of 2.0)

@MorrisJobke It would probably still be nice to properly catch this in the server, right?

[MorrisJobke]

How could we? Isn’t this due to a too big query from the calendar app?

[flokli]

In my case, this was a slow database - moving it to a faster underlying storage did work around the problem, but I'd consider nextcloud just failing randomly with some deadlocks a bug, not the slow storage...

[georgehrke]

How could we? Isn’t this due to a too big query from the calendar app?

Ok, so let's close this as a duplicate of nextcloud/calendar#445