[Bug 212561] stucking kyua test (/usr/tests/sys/acl/01) with enabled INVARIANT on FreeBSD 10.3-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212561

            Bug ID: 212561
           Summary: stucking kyua test (/usr/tests/sys/acl/01) with
                    enabled INVARIANT on FreeBSD 10.3-RELEASE
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: op at hardenedbsd.org
                CC: avg at FreeBSD.org, freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
             Flags: mfc-stable10?

How to reproduce:

--8<--

echo "WITH_TESTS=" >> /etc/src.conf
echo "options INVARIANT_SUPPORT" >> /usr/src/sys/amd64/conf/GENERIC
echo "options INVARIANTS" >> /usr/src/sys/amd64/conf/GENERIC

make buildworld kernel installworld
reboot

cd /usr/tests/sys/acl
kldload zfs
kyua test

--8<--

And I got these results: 

--8<--
root at f10:~ # kldload zfs
ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present;
            to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
root at f10:~ # cd /usr/tests/sys/acl/
root at f10:/usr/tests/sys/acl # ls
00                      04                      tools-nfs4-psarc.test
01                      Kyuafile                tools-nfs4-trivial.test
02                      run                     tools-nfs4.test
03                      tools-crossfs.test      tools-posix.test
root at f10:/usr/tests/sys/acl # kyua test
00:main  ->  passed  [0.516s]
01:main  ->  ^C[-- Signal caught; please wait for cleanup --]
^C[-- Signal caught; please wait for cleanup --]
broken: Caught unexpected exception: Tester received signal 6; this is a bug 
[96.360s]
kyua: E: Interrupted by signal 2.

root at f10:/usr/tests/sys/acl # uname -a
FreeBSD f10.3r 10.3-RELEASE FreeBSD 10.3-RELEASE #0: Sat Sep 10 16:29:10 UTC
2016     root at f10.3r:/usr/obj/usr/src/sys/GENERIC  amd64
--8<--

This is on unmodified (except the enabled INVARIANTS and enabled TESTS) FreeBSD
10.3-RELEASE.

It's full reproducible and possible relates to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209580

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