IBM added some text to the APAR The UCB overlaid was obtained from fixed storage location address BC (X'BC', 188), which is the PSA field FLCIOFP or FLCEIOINTPARM, the UCB associated with the most recent I/O interrupt.
Apparently TCP expected a register to point to some control block but it pointed to zero after a dub failure. They picked up what they expected to be a pointer to another control block, but instead they picked up the PSA address which points to the UCB from the most recent I/O interrupt (which may not even be associated with TCP).
-- Bruce A. Black Senior Software Developer for FDR Innovation Data Processing 973-890-7300 personal: [EMAIL PROTECTED] sales info: [EMAIL PROTECTED] tech support: [EMAIL PROTECTED] web: www.innovationdp.fdr.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
