I've seen this bug too. I've left kmail unattended for a while on a couple of occasions, and .xsession-errors grew to about 4GB, which filled the partition to 100%.
When I run kmail from an xterm I can see the error-messages scrolling up the screen, many per second. Even after I close kmail, the kio_imap4 processes hang around; just now I had three of them, bringing the system load-average to about 6. -- David Lee Lambert ... Software Developer Cell phone: +1 586-873-8813 ; alt. email <[EMAIL PROTECTED]> or <[EMAIL PROTECTED]> GPG key at http://www.lmert.com/keyring.txt -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]