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On most of the rhel-9 supp rhel arches except for aarch64, I see a few run-backtrace testcase failures:

FAIL: run-backtrace-native.sh
FAIL: run-backtrace-native-biarch.sh
FAIL: run-backtrace-native-core.sh
FAIL: run-backtrace-native-core-biarch.sh

The aarch64 only suffers from:

FAIL: run-backtrace-native.sh
FAIL: run-backtrace-native-core.sh


This is easy to reproduce, so not providing more details for now, but can do if needed.

Versions:

elfutils-0.185-4.el9
glibc-2.34-1.el9

This is upstream bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=28190
Resolved with the following patch:
https://sourceware.org/pipermail/elfutils-devel/2021q3/004019.html
Already in Fedora:
https://src.fedoraproject.org/rpms/elfutils/blob/rawhide/f/elfutils-0.185-raise-pthread_kill-backtrace.patch

For unrelated reasons the rhel9 elfutils.spec file makes a failing testsuite test not fatal, so it currently doesn't cause FTBFS even with glibc 2.34 installed.

Patch in hand, but it is really just a testcase issue.
It won't fix the general issue of the testsuite being "flaky".
To solve that a rebase would be most appropriate.

Verified based on CI test results:
https://beaker.engineering.redhat.com/matrix/?toggle_nacks_on=on&job_ids=6027159

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: elfutils), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:3995