FreeBSD-stable-15-amd64-test - Build #1207 - Still Unstable

FreeBSD-stable-15-amd64-test - Build #1207 (268e7c2ff7a0485c07a2b3b6dce2c186f25799ce) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1207/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1207/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1207/console

Status explanation:
"Unstable" - some tests are suspected being broken by the following changes
"Still Unstable" - the failing test cases have not been fixed by these
                   following changes and this is a notification to note that
                   these changes have not been fully tested by the CI system

Change summaries:
(Those commits are likely but not certainly responsible)

8d3658947030aedf037e2f7b48c313049eddc7ff by pkubaj:
tests/sys/kern: stress FP registers across sigreturn on powerpc64

aaa1abfc0ba6b366ef7fe48f70040f3a5b3e6b0c by pkubaj:
rtld: add .cfi_undefined lr to rtld_start.S on powerpc*

268e7c2ff7a0485c07a2b3b6dce2c186f25799ce by pkubaj:
powerpc64: give each CPU its own KDB trap stack



The failed test cases:

1 tests failed.
FAILED:  lib.libexecinfo.sigtramp_test.test_backtrace_sigtramp

Error Message:
/usr/src/lib/libexecinfo/tests/sigtramp_test.c:30: n > 1 not met