(gdb) info threads
  Id   Target Id                  Frame
* 1    LWP 104229 of process 1367 _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:40
  2    LWP 104767 of process 1367 0x000000080033bb97 in localeconv_l (loc=loc@entry=0x80045ad68 <__xlocale_global_locale>)
    at /usr/src/lib/libc/locale/localeconv.c:91
  3    LWP 104768 of process 1367 strcat () at /usr/src/lib/libc/amd64/string/strcat.S:60
(gdb) thread 2
[Switching to thread 2 (LWP 104767 of process 1367)]
#0  0x000000080033bb97 in localeconv_l (loc=loc@entry=0x80045ad68 <__xlocale_global_locale>) at /usr/src/lib/libc/locale/localeconv.c:91
91              M_ASSIGN_CHAR(int_p_cs_precedes);
(gdb) where
#0  0x000000080033bb97 in localeconv_l (loc=loc@entry=0x80045ad68 <__xlocale_global_locale>) at /usr/src/lib/libc/locale/localeconv.c:91
#1  0x000000080039246d in __vfprintf (fp=0x7fffdfffc380, locale=0x80045ad68 <__xlocale_global_locale>, fmt0=0x8002b668d "%s/%s", ap=0x7fffdfffc4d0)
    at /usr/src/lib/libc/stdio/vfprintf.c:480
#2  0x0000000800390b16 in snprintf (str=<optimized out>, n=<optimized out>, fmt=0x8002b668d "%s/%s") at /usr/src/lib/libc/stdio/snprintf.c:74
#3  0x000000080032e5fa in _citrus_esdb_open (db=db@entry=0x7fffdfffd260, esname=<optimized out>, esname@entry=0x7fffdfffd320 "UTF-8")
    at /usr/src/lib/libc/iconv/citrus_esdb.c:212
#4  0x00000008006f2b58 in _citrus_iconv_std_iconv_init_shared (ci=0x801203000, src=0x7fffdfffd320 "UTF-8", dst=0x7fffdfffd720 "UTF-8")
    at /usr/src/lib/libiconv_modules/iconv_std/citrus_iconv_std.c:365
#5  0x000000080032f252 in open_shared (rci=<optimized out>, convname=0x7fffdfffdb20 "UTF-8/UTF-8", src=0x7fffdfffd320 "UTF-8", dst=0x7fffdfffd720 "UTF-8")
    at /usr/src/lib/libc/iconv/citrus_iconv.c:180
#6  get_shared (rci=<optimized out>, src=0x7fffdfffd320 "UTF-8", dst=0x7fffdfffd720 "UTF-8") at /usr/src/lib/libc/iconv/citrus_iconv.c:235
#7  _citrus_iconv_open (rcv=rcv@entry=0x7fffdfffdf68, src=<optimized out>, src@entry=0x200660 "UTF-8", dst=<optimized out>, dst@entry=0x200660 "UTF-8")
    at /usr/src/lib/libc/iconv/citrus_iconv.c:313
#8  0x0000000800332615 in __bsd___iconv_open (out=0x200660 "UTF-8", in=0x200660 "UTF-8", handle=0x0) at /usr/src/lib/libc/iconv/bsd_iconv.c:79
#9  0x0000000000201a51 in iconv_thread ()
#10 0x0000000800255819 in thread_start (curthread=0x800a12500) at /usr/src/lib/libthr/thread/thr_create.c:292
#11 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffdfffe000
(gdb) thread 3
[Switching to thread 3 (LWP 104768 of process 1367)]
#0  strcat () at /usr/src/lib/libc/amd64/string/strcat.S:60
60      1:      cmpb    $0,-5(%rdi)     /* 4th byte == 0? */
(gdb) where
#0  strcat () at /usr/src/lib/libc/amd64/string/strcat.S:60
#1  0x000000080033ae47 in __part_load_locale (name=0x800461ac0 "en_US.UTF-8", using_locale=0x80045adb4 <__xlocale_global_locale+76>,
    locale_buf=0x800461a20 <__xlocale_global_numeric+64>, category_filename=0x8002b9033 "LC_NUMERIC", locale_buf_size_max=3, locale_buf_size_min=3,
    dst_localebuf=0x800461a28 <__xlocale_global_numeric+72>) at /usr/src/lib/libc/locale/ldpart.c:92
#2  0x000000080033b970 in numeric_load_locale (loc=0x8004619e0 <__xlocale_global_numeric>, using_locale=0x8002b9033, changed=<optimized out>,
    name=0x7fffdfdfcae0 "\220\313\337\337\377\177") at /usr/src/lib/libc/locale/lnumeric.c:72
#3  __numeric_load_locale (name=0x7fffdfdfcae0 "\220\313\337\337\377\177") at /usr/src/lib/libc/locale/lnumeric.c:92
#4  0x000000080033e6e3 in loadlocale (category=category@entry=4) at /usr/src/lib/libc/locale/setlocale.c:276
#5  0x000000080033e35f in setlocale (category=<optimized out>, locale=<optimized out>) at /usr/src/lib/libc/locale/setlocale.c:193
#6  0x0000000000201a8f in locale_thread ()
#7  0x0000000800255819 in thread_start (curthread=0x800a12a00) at /usr/src/lib/libthr/thread/thr_create.c:292
#8  0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffdfdfd000