[PHP] Error: fread(): file created in the system's temporary directory at /var/www/nextcloud/3rdparty/icewind/streams/src/Wrapper.php#91

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Nextcloud version: 18.0.4
Operating system and version: Raspbian 10 Buster
Apache version: 2.4.38
PHP version: 7.3.14-1~deb10u1

The issue you are facing:

After moving Data folder to external storage, anytime I upload something this get logged:

[PHP] Error: fread(): file created in the system’s temporary directory at /var/www/nextcloud/3rdparty/icewind/streams/src/Wrapper.php#91

But the file itself uploads fine, just the log gets spammed, and then it’s hard to notice if something else is wrong.

I tried moving temp directory from SD Card to my external drive and back, changing path settings in both config.php and php.ini but still the same. I also tried to uninstall all my clients and log out all my sessions, but after login back it’s the same.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Upload anything (Doesn’t matter if through web browser, Windows or Android client)
  2. Files gets uploaded
  3. Error line is logged

The output of your Nextcloud log in Admin > Logging:

[PHP] Error: fread(): file created in the system's temporary directory at /var/www/nextcloud/3rdparty/icewind/streams/src/Wrapper.php#91

PUT /nextcloud/remote.php/webdav/xx/xx.jpg
from IP by USERNAME at 2020-05-03T12:56:03+02:00

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => 'X',
  'passwordsalt' => 'X',
  'secret' => 'X',
  'trusted_domains' => 
  array (
    0 => 'X',
    1 => 'localhost',
    2 => 'X',
    3 => 'X',
  ),
  'datadirectory' => '/mnt/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '18.0.4.2',
  'overwrite.cli.url' => 'X',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'X',
  'dbpassword' => 'X',
  'installed' => true,
  'htaccess.RewriteBase' => '/nextcloud',
  'log_type' => 'file',
  'logfile' => '/var/www/nextcloud/logs/nextcloud.log',
  'logtimezone' => 'X',
  'log_rotate_size' => 104857600,
  'tempdirectory' => '/var/www/nextcloud/tmp',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => 'true',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'twofactor_enforced' => 'true',
  'twofactor_enforced_groups' => 
  array (
  ),
  'twofactor_enforced_excluded_groups' => 
  array (
  ),
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
);

The output of your Apache/nginx/system log in /var/log/____:

Nothing was logged at the time of PHP ERROR.

Please check the answer in Fread(): file created in the system's temporary directory at /var/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php#91