PHP Unlink and ImagickException

[dabbill]

Steps to reproduce

1. View logging under admin console

Expected behaviour

Not to see any errors

Actual behaviour

I have seeing lots of these errors with different image names.

[PHP] Error: unlink(/tmp/oc_tmp_YZ8APm-.png): No such file or directory at /srv/www/nextcloud/lib/private/Preview/Office.php#63

GET /core/preview?fileId=11550019&c=72f89b1176278571b6ed99452c521f4b&x=250&y=250&forceIcon=0
from 192.168.1.54 by dabbill at 2019-01-07T19:16:13+00:00

[core] Error: ImagickException: unable to open image `/tmp/oc_tmp_YZ8APm-.png': No such file or directory @ error/blob.c/OpenBlob/2761 at <>

0. /srv/www/nextcloud/lib/private/Preview/Office.php line 59
   __construct("/tmp/oc_tmp_YZ8APm-.png[0]")
1. /srv/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 59
   getThumbnail("4-8 Expository Paper Checklist.docx", 4096, 4096, false, OC\Files\View {})
2. /srv/www/nextcloud/lib/private/Preview/Generator.php line 194
   getThumbnail(OC\Preview\MSOffice2007 {}, OC\Files\Node\File {}, 4096, 4096)
3. /srv/www/nextcloud/lib/private/Preview/Generator.php line 118
   getMaxPreview(OC\Files\SimpleFS\SimpleFolder {}, OC\Files\Node\File {}, "application/vnd ... t")
4. /srv/www/nextcloud/lib/private/PreviewManager.php line 205
   getPreview(OC\Files\Node\File {}, 250, 250, true, "fill", "application/vnd ... t")
5. /srv/www/nextcloud/core/Controller/PreviewController.php line 175
   getPreview(OC\Files\Node\File {}, 250, 250, true, "fill")
6. /srv/www/nextcloud/core/Controller/PreviewController.php line 147
   fetchPreview(OC\Files\Node\File {}, 250, 250, false, false, "fill")
7. /srv/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php line 166
   getPreviewByFileId(11550019, 250, 250, false, false, "fill")
8. /srv/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php line 99
   executeController(OC\Core\Controller\PreviewController {}, "getPreviewByFileId")
9. /srv/www/nextcloud/lib/private/AppFramework/App.php line 118
   dispatch(OC\Core\Controller\PreviewController {}, "getPreviewByFileId")
10. /srv/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php line 47
    main("OC\Core\Controller\PreviewController", "getPreviewByFileId", OC\AppFramework\ ... {}, {_route: "core.P ... "})
11. <>
    __invoke({_route: "core.P ... "})
12. /srv/www/nextcloud/lib/private/Route/Router.php line 297
    call_user_func(OC\AppFramework\ ... {}, {_route: "core.P ... "})
13. /srv/www/nextcloud/lib/base.php line 987
    match("/core/preview")
14. /srv/www/nextcloud/index.php line 42
    handleRequest()

GET /core/preview?fileId=11550019&c=72f89b1176278571b6ed99452c521f4b&x=250&y=250&forceIcon=0
from 192.168.1.54 by dabbill at 2019-01-07T19:16:13+00:00

Server configuration

Operating system:
Fedora release 28 (Twenty Eight)

Web server:
nginx-1.12.1-8.fc28.src.rpm

Database:
MariaDB 10.2

PHP version:
7.2.13

Nextcloud version: (see Nextcloud admin page)
15.0.1 RC1 (Same errors on 15.0)

Updated from an older Nextcloud/ownCloud or fresh install:
Updated from older version, tried fresh install of v15.0.

Where did you install Nextcloud from:
Main nextcloud website

Signing status:

Signing status

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

Integrity checker has been disabled. Integrity cannot be verified.

List of activated apps:

App list

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Enabled: - accessibility: 1.1.0 - activity: 2.8.2 - admin_audit: 1.5.0 - announcementcenter: 3.4.0 - apporder: 0.6.0 - bruteforcesettings: 1.3.0 - calendar: 1.6.4 - camerarawpreviews: 0.6.3 - cloud_federation_api: 0.1.0 - comments: 1.5.0 - contacts: 3.0.1 - dashboard: 6.0.0 - dav: 1.8.0 - drop_account: 0.0.13 - encryption: 2.3.0 - external: 3.2.0 - federatedfilesharing: 1.5.0 - federation: 1.5.0 - files: 1.10.0 - files_accesscontrol: 1.5.0 - files_automatedtagging: 1.5.0 - files_downloadactivity: 1.4.0 - files_external: 1.6.0 - files_fulltextsearch: 1.2.3 - files_markdown: 2.0.5 - 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 - fulltextsearch: 1.2.3 - gallery: 18.2.0 - groupfolders: 2.0.2 - logreader: 2.0.0 - lookup_server_connector: 1.3.0 - metadata: 0.8.0 - music: 0.9.3 - news: 13.0.3 - nextcloud_announcements: 1.4.0 - notes: 2.5.1 - notifications: 2.3.0 - oauth2: 1.3.0 - onlyoffice: 2.1.2 - ownbackup: 18.11.0 - password_policy: 1.5.0 - previewgenerator: 2.0.0 - provisioning_api: 1.5.0 - qownnotesapi: 18.11.0 - radio: 0.6.4 - rainloop: 6.0.2 - ransomware_protection: 1.3.0 - registration: 0.4.5 - serverinfo: 1.5.0 - sharebymail: 1.5.0 - social: 0.1.2 - spreed: 5.0.0 - support: 1.0.0 - survey_client: 1.3.0 - systemtags: 1.5.0 - tasks: 0.9.8 - telephoneprovider: 1.0.2 - theming: 1.6.0 - twofactor_backupcodes: 1.4.1 - updatenotification: 1.5.0 - workflowengine: 1.5.0 Disabled: - admin_notifications - bookmarks_fulltextsearch - caniupdate - checksum - drawio - files_clipboard - files_fulltextsearch_tesseract - files_rightclick - flowupload - nextant - ocdownloader - ocr - passman - socialsharing_facebook - templateeditor - user_external - user_ldap - user_saml - weather - workin2gether

Nextcloud configuration:

Config report

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or 

Insert your config.php content here. 
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

{ "system": { "instanceid": "***REMOVED SENSITIVE VALUE***", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "secret": "***REMOVED SENSITIVE VALUE***", "trusted_domains": [ ], "datadirectory": "***REMOVED SENSITIVE VALUE***", "dbtype": "mysql", "version": "15.0.1.0", "dbname": "***REMOVED SENSITIVE VALUE***", "dbhost": "***REMOVED SENSITIVE VALUE***", "dbtableprefix": "oc_", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "logtimezone": "UTC", "appcodechecker": false, "updatechecker": false, "installed": true, "filesystem_check_changes": "1", "mail_from_address": "***REMOVED SENSITIVE VALUE***", "mail_smtpmode": "smtp", "mail_domain": "***REMOVED SENSITIVE VALUE***", "enable_avatars": true, "allow_user_to_change_display_name": true, "has_internet_connection": true, "check_for_working_htaccess": true, "enable_previews": true, "preview_libreoffice_path": "\/bin\/libreoffice", "filelocking.enabled": true, "enabledPreviewProviders": [ "OC\\Preview\\PNG", "OC\\Preview\\JPEG", "OC\\Preview\\GIF", "OC\\Preview\\BMP", "OC\\Preview\\XBitmap", "OC\\Preview\\MP3", "OC\\Preview\\TXT", "OC\\Preview\\MarkDown", "OC\\Preview\\MSOffice2003", "OC\\Preview\\MSOffice2007", "OC\\Preview\\MSOfficeDoc", "OC\\Preview\\OpenDocument", "OC\\Preview\\PDF", "OC\\Preview\\CR2", "OC\\Preview\\TIFF", "OC\\Preview\\RAW", "OC\\Preview\\SVG" ], "mail_smtpauthtype": "LOGIN", "mail_smtpauth": 1, "mail_smtpname": "***REMOVED SENSITIVE VALUE***", "mail_smtppassword": "***REMOVED SENSITIVE VALUE***", "mail_smtpsecure": "ssl", "mail_smtphost": "***REMOVED SENSITIVE VALUE***", "mail_smtpport": "465", "loglevel": 0, "debug": false, "trashbin_retention_obligation": "auto", "theme": "", "maintenance": false, "updater.release.channel": "beta", "memcache.local": "\\OC\\Memcache\\APCu", "memcache.locking": "\\OC\\Memcache\\Redis", "redis": { "host": "***REMOVED SENSITIVE VALUE***", "port": 6379 }, "integrity.check.disabled": true, "overwrite.cli.url": "https:\/\/nextcloud.dabbill.com", "mysql.utf8mb4": true, "mail_sendmailmode": "smtp" } }

Are you using external storage, if yes which one: local/smb/sftp/...
SFTP

Are you using encryption: yes/no
No

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

[daspuppy]

Same behaviour:
Nextcloud 15.0.2
Ubuntu 16.04
nginx 1.10.3
php7.2-fpm 7.2.14
mysql 14.14 Distrib 5.7.24

[josh4trunks]

I have a feeling this is related to PHP7.2.
I updated to Nextcloud 15.0.5 and previews for office documents worked as expected with PHP 7.0.
I then updated to PHP 7.2 and previews for office documents stopped working with the same error as @dabbill

[despens]

See the same for nextcloud 15.0.7, with the result of PDF previews not being created. With every directory access or preview generation event via cron job, the server attemps to create the preview again.

[jkoopmann]

Same here

[despens]

I fixed this problem for me by changing Imagemagick's policy.xml as described on this site: https://www.allerstorfer.at/imagemagick-fix-policymap/

[jkoopmann]

Hi. Tried that but it did not fix it for me. I still (or again) get these errors.... Any news?

[jkoopmann]

Just noticed: My current errors are not exactly the same one as I am not getting "not authorized" errors back. It appears to be a small percentage of files (XLS, DOC mainly) which seem to cause an error. What's the correct way of locating it? It looks just as the trail of the original poster but I cannot see the reason why ImageMagick fails to produce something...

If I run convert manually on this XLS file, several png files get created...

[jkoopmann]

ping...

any news on this?

[kesselb]

Should be fixed by #18456

[mueslo]

@kesselb unless the commit is not present in 18.0.3, it's not fixed.

[skjnldsv]

@kesselb unless the commit is not present in 18.0.3, it's not fixed.

It is.
Though I cannot reproduce the error 🤔