Looking by the logs, you (or someone else) might have ran into HTMLPurifier hang bug (it has been discussed before on the forum, look it up).
Code: Select all
2012-10-14 13:19:08: (mod_fastcgi.c.2701) FastCGI-stderr: PHP Fatal error: Maximum execut
ion time of 30 seconds exceeded in /var/www/virtual/online.tt-rss.org/htdocs/lib/htmlpurif
ier/library/HTMLPurifier/Strategy/MakeWellFormed.php on line 493
What this might mean is that you have some article HTML content which makes htmlpurifier hang while processing it. Which serves as a DOS attack because all process slots are busy with hang php processes.
Unfortunately, there is no alternative to htmlpurifier and it is providing a valuable service protecting users from various HTML-based attacks and whatnot, so I prefer to keep using it in trunk. I have disabled it on Online for the time being, let's see if this helps.