Server: NextCloud crashes because of __tostring

[rugk]

Steps to reproduce

1. It happened to me when doing these steps: https://help.nextcloud.com/t/users-encryption-key-is-never-generated/10083
2. So log in as a newly created user.

Expected behaviour

Do not crash.

Actual behaviour

Whole PHP-FPM crashes…

Server configuration

Operating system: Debian 9

Web server: nginx

PHP version: PHP 7.0.16-3

Nextcloud version: 11.0.2

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

Signing status: no errors

List of activated apps:

App list

Enabled:
  - activity: 2.4.1
  - admin_audit: 1.1.0
  - apporder: 0.3.3
  - audioplayer: 1.4.1
  - calendar: 1.5.1
  - comments: 1.1.0
  - contacts: 1.5.3
  - dav: 1.1.1
  - deck: 0.1.1
  - direct_menu: 0.10.0
  - encryption: 1.4.1
  - federatedfilesharing: 1.1.1
  - federation: 1.1.1
  - files: 1.6.1
  - files_automatedtagging: 1.1.1
  - files_markdown: 1.0.1
  - files_pdfviewer: 1.0.1
  - files_sharing: 1.1.1
  - files_texteditor: 2.2
  - files_trashbin: 1.1.0
  - files_versions: 1.4.0
  - files_videoplayer: 1.0.0
  - firstrunwizard: 2.0
  - gallery: 16.0.0
  - gpxedit: 0.0.4
  - gpxpod: 2.0.2
  - keeweb: 0.3.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.0.0
  - news: 10.1.0
  - nextcloud_announcements: 1.0
  - notes: 2.2.0
  - notifications: 1.0.1
  - ownpad: 0.5.7
  - passman: 2.1.1
  - password_policy: 1.1.0
  - provisioning_api: 1.1.0
  - richdocuments: 1.1.25
  - serverinfo: 1.1.1
  - sharebymail: 1.0.1
  - spreed: 1.2.0
  - survey_client: 0.1.5
  - systemtags: 1.1.3
  - tasks: 0.9.5
  - theming: 1.1.1
  - twofactor_backupcodes: 1.0.0
  - twofactor_totp: 1.1.0
  - twofactor_u2f: 1.1.0
  - updatenotification: 1.1.1
  - workflowengine: 1.1.1
Disabled:
  - external
  - files_accesscontrol
  - files_downloadactivity
  - files_external
  - files_retention
  - ojsxc
  - templateeditor
  - user_external
  - user_ldap
  - user_saml

The content of config/config.php:

Config report

nothing special, APCu+Redis used

Are you using external storage, if yes which one: no

Are you using encryption: yes

Nextcloud log (data/nextcloud.log)

nothing related

PHP/nginx log

2017/03/18 […] [error] 28049#28049: *14758 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Couldn't find implementation for method ::__tostring in Unknown on line 0" while reading response header from upstream, client: […], server: […], request: "GET /nextcloud/logout?requesttoken=UCIUyx/[…] HTTP/2.0", upstream: "fastcgi://unix:/run/php/php7.0-fpm[…]sock:", host: "[…]"
2017/03/18 […] [error] 28049#28049: *14758 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: […], server: […], request: "POST /nextcloud/settings/users/changepassword HTTP/2.0", upstream: "fastcgi://unix:/run/php/php7.0-fpm[…]sock:", host: "[…]"
2017/03/18 […] [error] 28048#28048: *15006 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Couldn't find implementation for method ::__tostring in Unknown on line 0" while reading response header from upstream, client: […], server: […], request: "POST /nextcloud/login?user=ghut HTTP/2.0", upstream: "fastcgi://unix:/run/php/php7.0-fpm[…]sock:", host: "[…]"

[MorrisJobke]

cc @schiessle

[ckorn]

It also happens when setting a password for a share with the Android app. I do not have encryption enabled in Nextcloud. I let apache handle the encryption with my own certs.

[rugk]

I let apache handle the encryption with my own certs.

Arrgh, that's something completely different, but thanks for mentioning you do not have file encryption enabled. In this case that's an even stranger error message…

[ckorn]

In bug #4019 you can see the error log from apache2. It also lists filenames and filenumbers. But on a quick look I do not see anything special. Maybe there is just a package missing I need to install on my Ubuntu cubieboard.

[rugk]

4019 <-- you can link bugs on GitHub (just place a # before)

[rkkoszewski]

Same issue here. PHP 7.0.16-3 and Nginx on a Raspberry Pi. (Fresh install)
You seem to have the same PHP version as me. Maybe it has something to do with this.

[rkkoszewski]

Just in case it hasn't been discussed here: By going to Admin > Additional settings and unticking Forbid common passwords seems to fix the problem. It's a fresh Nextcloud install, so I haven't noticed the issue anywhere else still.

[ckorn]

@rkkoszewski Thanks, that also works when setting a password in the app.

[leonklingele-work]

Commenting here because I got the same issue as @rugk and after disabling __Forbid common passwords__ as described here, I get these log messages:

2017/08/23 13:47:30 [error] 1890#0: *524 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Possible integer overflow in memory allocation (1 * 4294967287 + 104) in /usr/lib/nextcloud/www/lib/private/DB/Connection.php on line 386
PHP message: PHP Fatal error:  Possible integer overflow in number formatting (3 * 4294967295 + 10) in /usr/lib/nextcloud/www/lib/private/Log/File.php on line 86" while reading response header from upstream, client: 10.1.7.130, server: , request: "GET /apps/bruteforcesettings/ipwhitelist HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.0-fpm.sock:", host: "spreedbox-dev-leon4"
2017/08/23 13:47:30 [error] 1888#0: *592 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Possible integer overflow in number formatting (3 * 4294967295 + 10) in /usr/lib/nextcloud/www/lib/private/Log/File.php on line 86
PHP message: PHP Fatal error:  Possible integer overflow in number formatting (3 * 4294967295 + 10) in /usr/lib/nextcloud/www/lib/private/Log/File.php on line 86" while reading response header from upstream, client: 10.1.7.130, server: , request: "GET /settings/ajax/checksetup HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.0-fpm.sock:", host: "spreedbox-dev-leon4"
2017/08/23 13:47:30 [error] 1890#0: *527 FastCGI sent in stderr: "PHP message: PHP Notice:  Uninitialized string offset: 0 in /usr/lib/nextcloud/www/lib/base.php on line 164

Reloading PHP FPM (service php7.0-fpm reload) "solved" the issue.

[dennisheitmann]

[Sat Sep 16 15:46:11.093599 2017] [:error] [pid 1095] [client 192.168.0.127:46928] PHP Fatal error: Couldn't find implementation for method \x94\x11w\xa8r::__tostring in Unknown on line 0 [Sat Sep 16 15:46:11.158126 2017] [:error] [pid 2031] [client 192.168.0.127:46930] PHP Fatal error: require_once(): \x8f\v\xb3\xd0\xcc\xd6u\xa8\xe8\xd6u\xa8\xa5\xb5\x02\x80\x06 in /var/www/owncloud/owncloud/lib/base.php on line 54

[schiessle]

can't reproduce it. Feel free to re-open if this is still an issue with the latest version of Nextcloud