Sometimes when I try to upload a file using PHP sometimes I get a Internal Server error. The error log then shows:2019-06-17 18:21:24: (chunk.c.553) opening temp-file failed: No such file or directory. Restarting the webservice solves this issue.
backend: gridengine distribution: debian version: 3 web: lighttpd
The problem isn't in the code of the application, because the live server (not WMF hosted) never gives this issue.