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
07850000 80000000
0003 031C 009FEA30 EXT TIMR 00000000_0872BFAE 00001005
07851000 80000000
0001 031C 009FEA30 DSP 00000000_0872BFAE 00000000 00000000 26C62364
07851000 80000000
0001 031C 009FEA30 I/O 06B16 00000000_0872C2C8 00104007 745786C0 0C000100
07850000 80000000 025AC1C0 00400000
0001 031C 009FEA30 SSRV 11F 9EE5C3D6 16701A80 80000000 157A25F8
00F60000
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? — Peter Hunkeler
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