Find out what is causing premature end of script headers

[dstonek]

Hello all,

Looking at my http error log file sometimes I see some of theese error messages

Connection reset by peer: mod_fcgid: read data from fastcgi server error.
[Sun Mar 13 10:46:55 2011] [error] [client 66.249.72.44] Premature end of script headers: file.php

mod_fcgid: read data timeout in 46 seconds
[Sun Mar 13 10:39:12 2011] [error] [client 66.249.72.44] Premature end of script headers: file.php

It seems like some requests are not finished.
How can I find out what is causing that in file.php ?

[dstonek]

At the beginning and at the end of file.php I am using getrusage() to get stime and utime for the entire script process.
An advice is sent to me when it is longer than 1000ms=1sec
Around 100 advices I got in one day (10000 accesses/day). None of them took more than 2 secs
In http error log I got 15 of those timeout error messages for file.php

What can be happening?

Thank you