From https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:G/apr/standard/x86_64:
testprocmutex       :  Line 122: child did not terminate with success

the child dies on https://github.com/apache/apr/blob/trunk/test/testprocmutex.c#L93:
                while ((rv = apr_proc_mutex_timedlock(proc_lock, 1))) {
                    if (!APR_STATUS_IS_TIMEUP(rv))
                        exit(1); <----- here

The test creates 6 children and does some pthread_mutex_lock/unlock in parallel. And it expects one of the to fail under some circumstances. That does not happen in 6.7.

If I revert:
commit fbeb558b0dd0d6348e0872bbbbe96e30c65867b7
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Fri Sep 15 17:19:44 2023 +0200

    futex/pi: Fix recursive rt_mutex waiter state

it works.

The test could be broken too.