[Bug 2055175] [NEW] [UBUNTU 23.10] s390x: clone clobbers r7

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=== Description by STLI at de.ibm.com ==

On s390x, if clone is called with NULL for child-function or stack
argument, then r7 is clobbered. This bug is needed for glibc 2.37, 2.38,
2.39. Please pick the committed bugfix.

See
- glibc bugzilla:
Bug 31402 - clone (NULL, NULL, ...) clobbers %r7 register on s390{,x}
https://sourceware.org/bugzilla/show_bug.cgi?id=31402

- glibc-commit on master:
S390: Do not clobber r7 in clone [BZ #31402]
https://sourceware.org/git/?p=glibc.git;a=commit;h=02782fd12849b6673cb5c2728cb750e8ec295aa3

- glibc-commit on release/2.37/master:
https://sourceware.org/git/?p=glibc.git;a=commit;h=9a1bdd7df731a4bc60f72dbdc1b849e02cfa9c34

- glibc-commit on release/2.38/master:
https://sourceware.org/git/?p=glibc.git;a=commit;h=ee4806e978467d705b26ccb7dfddb9e0a710f8e4

- glibc-commit on release/2.39/master:
https://sourceware.org/git/?p=glibc.git;a=commit;h=e0910f1d3278f05439fb434ee528fc9be1b6bd5e

** Affects: glibc (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s3903164 bugnameltc-205731 severity-medium targetmilestone-inin---
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[UBUNTU 23.10] s390x: clone clobbers r7
https://bugs.launchpad.net/bugs/2055175
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