Alan Cox committed a patch to 2.6 to "Use the existing "tty_sem" to protect against the process tty changes too.", this was included in 2.6.10-ac4. This issue may affect RHEL4 Patch available at: http://linux.bkbits.net:8080/linux-2.6/cset@41ddda70CWJb5nNL71T4MOlG2sMG8A
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-092.html