On upgrade to NC12 clients locally delete content from shared folder

I just upgraded our nextcloud instance from 11.0.2 to 12 using the webupdater
After the update ran we noticed the the desktop sync clients all deleted the contents of a shared folder we all had access to. Everything was still there in the WebUI.
But in order to get the client state in sync again I had to delete the .sync*.db file and redownload the complete folder contents. Without deleting the db file nothing would be synced again.

This apparently only happended to this one folder but on every connected client.

I will share what logs I have but Iā€™m not sure whether this is a client or server issue and where to report this.

Client log

#=#=#=# Syncrun started 2017-05-30T17:54:19 
#=#=#=#=# Propagation starts 2017-05-30T17:54:20 (last step: 914 msec, total: 914 msec) 
||SHARED-FOLDER/SUBFOLDER1/SOMEFILE|INST_REMOVE|Down|1478028004||210260||4||0|0|0|||INST_NONE| 
||SHARED-FOLDER/SUBFOLDER1/SOMEOTHERFILE|INST_REMOVE|Down|1492092520||11254||4||0|0|0|||INST_NONE| 
||SHARED-FOLDER/SUBFOLDER1/SUBFOLDER2/SOMEFILE|INST_REMOVE|Down|1494522868||24414||4||0|0|0|||INST_NONE| 
[...] For a few hundred more lines.

Then a lot of empty sync runs and finally downloading everything again.

Server log


There are a few exceptions in the end but Iā€™m not sure they are related.

Config

{
    "system": {
        "instanceid": "ocdp8h4ezfnn",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "auth.bruteforce.protection.enabled": false,
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "xxxxx"
        ],
        "datadirectory": "\/srv\/nextcloud-data",
        "skeletondirectory": "",
        "overwrite.cli.url": "xxxxx",
        "dbtype": "mysql",
        "version": "12.0.0.29",
        "dbname": "nextcloud_akdsfh",
        "dbhost": "localhost",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "mail_smtpmode": "smtp",
        "mail_smtphost": "10.0.3.1",
        "mail_smtpport": "25",
        "mail_from_address": "xxxx",
        "mail_domain": "xxxx",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "\/var\/run\/redis\/redis.sock",
            "port": 0,
            "timeout": 0
        },
        "htaccess.RewriteBase": "\/",
        "theme": "",
        "loglevel": 2,
        "maintenance": false,
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    },
    "apps": {
        "activity": {
            "enabled": "yes",
            "installed_version": "2.5.2",
            "types": "filesystem"
        },
        "admin_audit": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "logging"
        },
        "backgroundjob": {
            "lastjob": "1"
        },
        "bruteforcesettings": {
            "enabled": "yes",
            "installed_version": "1.0.2",
            "types": ""
        },
        "calendar": {
            "enabled": "yes",
            "installed_version": "1.5.3",
            "ocsid": "168707",
            "types": ""
        },
        "comments": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "logging"
        },
        "contacts": {
            "enabled": "yes",
            "installed_version": "1.5.3",
            "ocsid": "168708",
            "types": ""
        },
        "core": {
            "OC_Channel": "stable",
            "backgroundjobs_mode": "cron",
            "installedat": "1475183312.9459",
            "lastcron": "1496171703",
            "lastupdateResult": "[]",
            "lastupdatedat": "1496169699",
            "moveavatarsdone": "yes",
            "oc.integritycheck.checker": "[]",
            "previewsCleanedUp": "1",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "repairlegacystoragesdone": "yes",
            "scss.variables": "073180797d04c2845cb6de79572add0c",
            "umgmt_send_email": "true",
            "umgmt_show_email": "true",
            "umgmt_show_last_login": "true",
            "updater.secret.created": "1496159557",
            "vendor": "nextcloud"
        },
        "dav": {
            "buildCalendarSearchIndex": "yes",
            "enabled": "yes",
            "installed_version": "1.3.0",
            "types": "filesystem"
        },
        "federatedfilesharing": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "federation": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "authentication"
        },
        "files": {
            "cronjob_scan_files": "500",
            "enabled": "yes",
            "installed_version": "1.7.2",
            "types": "filesystem"
        },
        "files_pdfviewer": {
            "enabled": "yes",
            "installed_version": "1.1.1",
            "ocsid": "166049",
            "types": ""
        },
        "files_sharing": {
            "enabled": "yes",
            "installed_version": "1.4.0",
            "types": "filesystem"
        },
        "files_texteditor": {
            "enabled": "yes",
            "installed_version": "2.4.1",
            "ocsid": "166051",
            "types": ""
        },
        "files_trashbin": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        },
        "files_versions": {
            "enabled": "yes",
            "installed_version": "1.5.0",
            "types": "filesystem"
        },
        "files_videoplayer": {
            "enabled": "yes",
            "installed_version": "1.1.0",
            "types": ""
        },
        "firstrunwizard": {
            "enabled": "yes",
            "installed_version": "2.1",
            "types": "logging"
        },
        "gallery": {
            "enabled": "yes",
            "installed_version": "17.0.0",
            "types": ""
        },
        "logreader": {
            "enabled": "yes",
            "installed_version": "2.0.0",
            "levels": "00111",
            "ocsid": "170871",
            "relativedates": "1",
            "types": ""
        },
        "lookup_server_connector": {
            "enabled": "yes",
            "installed_version": "1.0.0",
            "types": "authentication"
        },
        "nextcloud_announcements": {
            "enabled": "yes",
            "installed_version": "1.1",
            "pub_date": "Sat, 10 Dec 2016 00:00:00 +0100",
            "types": "logging"
        },
        "notes": {
            "enabled": "yes",
            "installed_version": "2.2.0",
            "types": ""
        },
        "notifications": {
            "enabled": "yes",
            "installed_version": "2.0.0",
            "types": "logging"
        },
        "oauth2": {
            "enabled": "yes",
            "installed_version": "1.0.5",
            "types": "authentication"
        },
        "password_policy": {
            "enabled": "yes",
            "enforceUpperLowerCase": "0",
            "installed_version": "1.2.2",
            "minLength": "8",
            "types": ""
        },
        "provisioning_api": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "prevent_group_restriction"
        },
        "serverinfo": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "sharebymail": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        },
        "spreed": {
            "enabled": "yes",
            "installed_version": "2.0.1",
            "types": "prevent_group_restriction"
        },
        "systemtags": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "logging"
        },
        "tasks": {
            "enabled": "yes",
            "installed_version": "0.9.5",
            "types": ""
        },
        "theming": {
            "backgroundMime": "backgroundColor",
            "cachebuster": "22",
            "color": "#7A7A7A",
            "enabled": "yes",
            "installed_version": "1.3.0",
            "name": "CTS Cloud",
            "slogan": "CarTelSol Nextcloud.",
            "types": "logging",
            "url": "http:\/\/cartelsol.com"
        },
        "twofactor_backupcodes": {
            "enabled": "yes",
            "installed_version": "1.1.1",
            "types": ""
        },
        "updatenotification": {
            "core": "11.0.3.2",
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "workflowengine": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        }
    }
}

Any advice on where how to report this further? Client, server or user bug? :wink: