Yes, they are part of the I/O interrupt processing, and are not related to the interrupted program (unless the I/O operation that caused the interrupt is related to the interrupted program) .
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY > From: "Peter Hunkeler" <p...@gmx.ch> > To: IBM-MAIN@LISTSERV.UA.EDU > Date: 12/13/2018 01:38 PM > Subject: Wtrln.: Are those SSRV trace entires relate to the I/O interrupt? > Sent by: "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> > > I'm chasing another problem where an LE program (COBOL) gets into > an endless, rather tight loop in CEEPLPKA after an S04E abend I'm > trying to understand the relation between I/O interrupt system trace > entries, and a pair of SSRV entries that very often follow the I/O entry. > > > Here is a sample sequence from the trace: > > 0003 031C 009FEA30 DSP 00000000_0872C4B6 00000000 00000000 26C62364 > 0003 031C 009FEA30 EXT TIMR 00000000_0872BFAE 00001005 > 0001 031C 009FEA30 DSP 00000000_0872BFAE 00000000 00000000 26C62364 > 0001 031C 009FEA30 I/O 06B16 00000000_0872C2C8 00104007 745786C0 > 0001 031C 009FEA30 SSRV 11F 9EE5C3D6 16701A80 80000000 157A25F8 > 0001 031C 009FEA30 SSRV 150 02F5F020 00000000 7EB06940 00000000 > > The program is dispatched (DSP), interrupted at end of time slice > (EXT TIMR), dispatched again (DSP), then interrupted by an I/O which > completed (I/O). Very often, two system service calls (SSRV), first > for RELEASE (SSRV 115), second for DFSMS Media Manager ICYDIE (SSRV > 150) are seen. > > First I thought the SSRVs are related to the program, but I now have > my doubts. I'd rather think they are caused by I/O interrupt > handling. Especially, since I have seen such sequences in another > dumps, although much less often. > > Can anyone say something about the nature of those SSRV calls. > Am I safe to say they do not belong to the problem at hand? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
