Handler for (null) returned invalid result code 70007 / causing error 500?

Question

I am getting these errors on some pages in my site (php/apache/linux/mysql vps) on intervals and can't seem to find any reproducible scenario :

Handler for (null) returned invalid result code 70007

or

Handler for (null) returned invalid result code 70014

It occurs mainly on pages where file (image) uploads are done. It then causes a 500 error.

Google hasn't returned anything conclusive, has anybody come across these errors ?

Solution

7 is "time up" and 14 is "EOF", so the root cause of this is probably a read timeout during the upload.

The 70000 prefix means they are APR status codes.

They are logged poorly here because they the core of apache is expecting a different type of error code then what is returned -- these are APR or "filter" return codes but the core of httpd is expecting a HTTP status code or 0 for OK.