Emacs and LLD

Hi,

I cannot build editors/emacs-nox11 (or any other Emacs port) on FreeBSD
12 anymore for several months now.  The build aborts with:

./temacs --batch --load loadup bootstrap
Fatal error 'Can't allocate initial thread' at line 337 in file
/usr/src/lib/libthr/thread/thr_init.c (errno = 12)
gmake[3]: *** [Makefile:737: bootstrap-emacs] Abort trap (core dumped)

I'm currently running base r324724.  Emacs builds fine on the cluster,
so I thought installing the binary package from pkg.FreeBSD.org would be
an OK solution, but it immediately crashes too.

My src.conf has WITH_LLD_IS_LD=yes and reading
https://bugs.freebsd.org/214864 leads me to believe that it's somehow
responsible for the problems I have with Emacs.

Setting LLD_UNSAFE=yes in the port does not solve the problem.  If I
manually link temacs statically the build can continue, however the
emacs binary temacs dumps is not usable and immediately crashes.

I can "solve" the problem (in the sense that I can run Emacs again
outside of a chroot/jail) by extracting /lib/libc.so.7 from a recent
snapshot (I tried with 20171012-r324542 and the current base.txz
snapshot) not built with LLD and running it with

LD_PRELOAD="/path/to/libc.so.7" emacs

It'll do for now, but this just doesn't feel right...

Thanks in advance for any insight you can provide!

Backtrace from temacs:

* thread #1, name = 'temacs', stop reason = signal SIGABRT
  * frame #0: 0x0000000800e089aa libc.so.7`__sys_thr_kill at
  thr_kill.S:3
    frame #1: 0x0000000800e08974 libc.so.7`__raise(s=6) at raise.c:52
    frame #2: 0x0000000800e088e9 libc.so.7`abort at abort.c:65
    frame #3: 0x0000000800c8c88a
    libthr.so.3`_thread_exitf(fname=<unavailable>, lineno=<unavailable>,
    fmt=<unavailable>) at thr_exit.c:193
    frame #4: 0x0000000800c8a02e
    libthr.so.3`_libpthread_init(curthread=0x0000000000000000) at
    thr_init.c:337
    frame #5: 0x0000000800c8d4b2 libthr.so.3
    frame #6: 0x0000000800c8d4d6 libthr.so.3`_init + 14
    frame #7: 0x00000008007b0058
    ld-elf.so.1`objlist_call_init(list=<unavailable>,
    lockstate=<unavailable>) at rtld.c:2643
    frame #8: 0x00000008007af3eb
    ld-elf.so.1`_rtld(sp=0x00007fffffffdf08,
    exit_proc=0x00007fffffffdeb0, objp=0x00007fffffffdeb8) at rtld.c:759
    frame #9: 0x00000008007ad019 ld-elf.so.1`.rtld_start at
    rtld_start.S:39