[horde] Infinite loop

[Maxime Pelletier]

  Hi all,

On August 30, we had an infinite loop with Horde. A HTTPD process started
to take 100% CPU and was continiously generating the same logs (more than a
thousand time):
===============
....
Aug 30 15:43:22 horde HORDE: [imp] PHP ERROR: Undefined index: a [pid 24398
on line 844 of "/var/www/html/horde/imp/lib/Imap/Tree.php"]
Aug 30 15:43:22 horde HORDE: [imp] PHP ERROR: Undefined index: a [pid 24398
on line 844 of "/var/www/html/horde/imp/lib/Imap/Tree.php"]
Aug 30 15:43:22 horde HORDE: [imp] PHP ERROR: Undefined index: a [pid 24398
on line 844 of "/var/www/html/horde/imp/lib/Imap/Tree.php"]
Aug 30 15:43:22 horde HORDE: [imp] PHP ERROR: Undefined index: a [pid 24398
on line 844 of "/var/www/html/horde/imp/lib/Imap/Tree.php"]
....
===============

Unfortunately, I don't have more log about it.

I first tried to kill the HTTPD process but it came back a few seconds
later.

I ended up blocking the user IP address with iptables, which was a desktop
IP address, so most likely using dynamic view.

Let me know if you have an idea about it, or if you want me to raise a bug
ticket about it.

Thanks
Maxime