statethreads crashes in ld on 6.4

statethreads (http://state-threads.sourceforge.net/) crashes on
OpenBSD 6.4/amd64 (release) with an error in ld (see below); it
works fine on previous OpenBSD versions. Do I have to set some
"special" cc/ld options to make this work? Or are patches to
statehreads required (there doesn't seem to be a port for it,
otherwise I would try that)?

#0 0x00000c0b0980db08 in _dl_bind (object=0xc0a85cff400, index=)
from /usr/libexec/ld.so
(gdb) where
#0 0x00000c0b0980db08 in _dl_bind (object=0xc0a85cff400, index=)
from /usr/libexec/ld.so
#1 0x00000c0b098080dd in _dl_bind_start ()
at /usr/src/libexec/ld.so/amd64/ldasm.S:108
#2 0x00000c08448058bc in st_accept (fd=0xc0a634981c0, addr=0xc0ae5a31dd0,
addrlen=0xc0ae5a31dcc, timeout=18446744073709551615)
at ../../mta/statethreads/io.c:258
#3 0x00000c0844802928 in handle_connections (arg=0x0)
at ../../../mta/statethreads/examples/server.c:880
#4 0x00000c0844803e4a in st_thread_create (start=0, arg=)
at ../../mta/statethreads/sched.c:329
#5 0x00000c0844801e38 in start_threads ()
at ../../../mta/statethreads/examples/server.c:855
#6 0x00000c0844800b17 in main (argc=6, argv=0x7f7ffffd4ec8)
at ../../../mta/statethreads/examples/server.c:266
(gdb) print *object
$2 = {obj_base = 13229648510976, load_name = 0xc0b0ee98d90 "./server",
load_dyn = 0xc0844a0dbc8, next = 0xc0a4aacb800, prev = 0x0,
load_base = 13229648510976, load_list = 0xc0a64e9c400, load_size = 2158592,
Dyn = {info = 0xc0a85cff440, u = {null = 0, needed = 1, pltrelsz = 1872,
pltgot = 0xc0844a0dd28, hash = 0xc0844908960, strtab = 0xc0844909650 "",
symtab = 0xc0844908c90, rela = 0xc0844909940, relasz = 1152,
relaent = 24, strsz = 748, syment = 24, init = 0, fini = 0,
soname = 0x0, rpath = 0x0, symbolic = 0, rel = 0x0, relsz = 0,
relent = 0, pltrel = 7, debug = 0, textrel = 0, jmprel = 13229649599936,
bind_now = 0, init_array = 0x0, fini_array = 0x0, init_arraysz = 0,
fini_arraysz = 0, runpath = 0x0, flags = 0, encoding = 0,
preinit_array = 0x0, preinit_arraysz = 0}}, relacount = 45,
relcount = 0, status = 5, phdrp = 0xc0844800040, phdrc = 10, obj_type = 2,
obj_flags = 2, buckets = 0xc0844908968, nbuckets = 97,
chains = 0xc0844908aec, nchains = 104, dynamic = 0x0, child_list = {
tqh_first = 0xc0ab8651740, tqh_last = 0xc0ab8651740}, grpsym_list = {
tqh_first = 0xc0aab280e40, tqh_last = 0xc0ad21a8bc0}, grpref_list = {
tqh_first = 0x0, tqh_last = 0xc0a85cff5c8}, refcount = 0, opencount = 1,
grprefcount = 0, load_object = 0xc0a85cff400, sod = {
sod_name = 13240289961776, sod_library = 0, sod_reserved = 0,
sod_major = 0, sod_minor = 0, sod_next = 0}, dev = 0, inode = 0,
tls_fsize = 0, tls_msize = 0, tls_align = 0, tls_static_data = 0x0,
tls_offset = 0, relro_addr = 13229650663352, relro_size = 2120,
grpsym_gen = 0, rpath = 0x0, runpath = 0x0, traced = 0}


$ ldd server
server:
Start End Type Open Ref GrpRef Name
0000004e8ca00000 0000004e8cc0f000 exe 1 0 0 server
00000051672ec000 00000051675db000 rlib 0 1 0 /usr/lib/libc.so.92.5
0000005183400000 0000005183400000 ld.so 0 1 0 /usr/libexec/ld.so

ld doesn't seem to be mentioned in errata64.html, so I guess there's
no relevant change for it.

The test program (as well as statethreds) is part of MeTA1 in case
someone can take a look at it.