I think its not a bug, I experienced the same after running the cache:clean command as root user.

So by applying the file permission again this issue has been fixed. http://devdocs.magento.com/guides/v2.2/install-gde/prereq/file-sys-perms-over.html

So be careful don't clean the cache as root user

Hope this helps!

Best Regards, Asad

I think its not a bug, I experienced the same after running the cache:clean command as root user.

So by applying the file permission again this issue has been fixed. http://devdocs.magento.com/guides/v2.2/install-gde/prereq/file-sys-perms-over.html

So be careful don't clean the cache as root user.

I think its not a bug, I experienced the same after running the cache:clean command as root user.

So by applying the file permission again this issue has been fixed. http://devdocs.magento.com/guides/v2.2/install-gde/prereq/file-sys-perms-over.html

So be careful don't clean the cache as root/sudo user

Hope this helps!

Best Regards, Asad

I think its not a bug, I experienced the same after running the cache:clean command as root user.

So by applying the file permission again this issue has been fixed. http://devdocs.magento.com/guides/v2.2/install-gde/prereq/file-sys-perms-over.html

So be careful don't clean the cache as root user

Hope this helps!

Best Regards, Asad