FreeBSD-stable-14-amd64-test - Build #1142 - Still Unstable

FreeBSD-stable-14-amd64-test - Build #1142 (a75f920158c7f163ba1ebde1eb4ff42244d7a82d) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-stable-14-amd64-test/1142/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-stable-14-amd64-test/1142/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-stable-14-amd64-test/1142/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)

4c989e2aba9956bac2a70438eb7a4116bc75c27d by kib:
kern_sig.c: extract the first stop handling into a helper

18e0f9ec54e83fae684d51fe08f8b2b7390da006 by kib:
PT_ATTACH: do not interrupt interruptible sleeps

2b11b13b04bd4b5a0519850d35b334fe420502ca by kib:
kern_sig.c: add chicken bit for old way of SIGSTOP handling on PT_ATTACH

a86e21e2caaa9796308282a235bdb42bd3c71292 by kib:
ptrace(): p_xthread could be NULL for P_STOPPED_TRACE

75c6434b17198116553685f56e0979176f6337da by kib:
sig_handle_first_stop(): allow NULL leader thread

f0ba6535d446ed79b628e3cd27a971131752ee44 by kib:
sig_handle_first_stop(): notify debugger

82ceed2dc7a560c6a718f75334546528d77ecb9d by kib:
ptrace_test PT_SC_REMOTE: fix a race

6b7c520b915e1df72dee494b8abbc5d0fefd30b0 by kib:
ptrace_test: add test for the PT_ATTACH behavior on sleeping thread

3637d81e8f6875c7f777ca3cf14a2fc3e601db60 by kib:
x86: add cpu_stdext_feature4

2a6ec58c6d92a774270533841397f72d35be2caf by kib:
amd64: add elfctl bit to enable LA57

64a8ac8c63d3b84b5da8042e5e314aa7938f5b10 by kib:
amd64: make LA57 mode for a process opt-in by default

c5e3af9013efa1fe015eed0f580c6742f8a5ad8a by kib:
elfctl: add knowledge about the la57 bit

a75f920158c7f163ba1ebde1eb4ff42244d7a82d by kib:
net/sff8472.h: add double-include protection



The failed test cases:

3 tests failed.
FAILED:  bin.pwait.pwait_test.time_unit

Error Message:
atf-check failed; see the output of the test for details

FAILED:  sys.netinet.fibs_test.same_ip_multiple_ifaces_fib0

Error Message:
atf-check failed; see the output of the test for details

FAILED:  sys.netlink.test_netlink_message_writer.py.__test_cases_list__

Error Message:
Test program did not exit cleanly