I verified the fix for glibc:
root@glibc-fp-ibm:~# ./dwprod.py /usr/lib/s390x-linux-gnu/libc.so.6 | grep
backchain | wc -l
1843
root@glibc-fp-ibm:~# ./dwprod.py /usr/lib/s390x-linux-gnu/libc.so.6 | grep
no-omit-frame | wc -l
2
root@glibc-fp-ibm:~# dpkg -l libc6
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-===============-============-=================================
ii libc6:s390x 2.39-0ubuntu8.3 s390x GNU C Library: Shared libraries
(the two outliers for the no-omit-frame-pointer option are deliberate
upstream decisions that have always been so, thus considered out of
scope for this SRU)
** Changed in: glibc (Ubuntu Oracular)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2064538
Title:
Revert back frame pointers for s390x (remove -fno-omit-frame-pointer
but use -mbackchain)
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