Thank you. Here is the stack trace with all debug symbols:

(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f88b6cc742a in __GI_abort () at abort.c:89
#2  0x00007f88b5b240ad in __gnu_cxx::__verbose_terminate_handler() () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007f88b5b22066 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007f88b5b220b1 in std::terminate() () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007f88b5b222c9 in __cxa_throw () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f88b5b227ec in operator new(unsigned long) () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#7  0x00007f88b5e681b6 in 
__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::allocate (this=<optimized out>, __n=1) at 
/usr/include/c++/6/ext/new_allocator.h:104
#8  
std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > > 
>::allocate (__a=..., __n=1) at /usr/include/c++/6/bits/alloc_traits.h:436
#9  std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_get_node (this=<optimized out>) at /usr/include/c++/6/bits/stl_tree.h:505
#10 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_create_node<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (this=<optimized out>)
    at /usr/include/c++/6/bits/stl_tree.h:559
#11 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node::operator()<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) const (
    this=<synthetic pointer>, __arg=<optimized out>) at 
/usr/include/c++/6/bits/stl_tree.h:473
#12 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_insert_<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm>, 
std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node>(std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, 
std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&, 
std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node&) (__node_gen=<synthetic pointer>..., __v=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>, __p=0x7f88b78c7010, __x=0x0, this=0x55d404f29c60)
    at /usr/include/c++/6/bits/stl_tree.h:1535
#13 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_insert_unique<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (
    this=this@entry=0x55d404f29c60, __v=__v@entry=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>) at /usr/include/c++/6/bits/stl_tree.h:1894
#14 0x00007f88b5e67282 in std::map<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::insert<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>, 
void>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (__x=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>, this=<optimized out>) at 
/usr/include/c++/6/bits/stl_map.h:740
#15 Xapian::Document::Internal::add_term (this=<optimized out>, 
tname="XMIDascoding.c", wdfinc=wdfinc@entry=1) at ../api/omdocument.cc:371
#16 0x00007f88b5e672f9 in Xapian::Document::add_term 
(this=this@entry=0x7fff87c611a0, tname="XMIDascoding.c", wdfinc=wdfinc@entry=1) 
at ../api/omdocument.cc:139
#17 0x00007f88b622e9e6 in fts_backend_xapian_index_hdr (dbx=0x55d3f840f9f0, 
uid=<optimized out>, field=<optimized out>, data=data@entry=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", p=<optimized 
out>, f=<optimized out>)
    at fts-backend-xapian-functions.cpp:661
#18 0x00007f88b62325d6 in fts_backend_xapian_update_build_more 
(_ctx=0x55d3f827ef80, data=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", 
size=<optimized out>) at fts-backend-xapian.cpp:330
#19 0x00007f88b66439a8 in fts_build_data (ctx=ctx@entry=0x7fff87c61820, 
data=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", size=53, 
last=last@entry=true) at fts-build-mail.c:425
#20 0x00007f88b66441f7 in fts_build_unstructured_header (hdr=<optimized out>, 
hdr=<optimized out>, ctx=0x7fff87c61820) at fts-build-mail.c:103
#21 fts_build_mail_header (block=0x7fff87c617b0, block=0x7fff87c617b0, 
ctx=0x7fff87c61820) at fts-build-mail.c:178
#22 fts_build_mail_real (may_need_retry_r=0x7fff87c61763, 
retriable_err_msg_r=0x7fff87c61770, mail=0x55d3f81ca5b8, 
update_ctx=0x55d3f827ef80) at fts-build-mail.c:568
#23 fts_build_mail (update_ctx=0x55d3f827ef80, mail=mail@entry=0x55d3f81ca5b8) 
at fts-build-mail.c:617
#24 0x00007f88b664b6c3 in fts_mail_index (_mail=0x55d3f81ca5b8) at 
fts-storage.c:538
#25 fts_mail_precache (_mail=0x55d3f81ca5b8) at fts-storage.c:559
#26 0x00007f88b73f5d6a in mail_precache (mail=0x55d3f81ca5b8) at mail.c:424
#27 0x000055d3f72d4603 in index_mailbox_precache (conn=0x55d3f804a9e0, 
box=0x55d3f829eb48) at master-connection.c:102
#28 index_mailbox (user=<optimized out>, user=<optimized out>, what=<optimized 
out>, max_recent_msgs=<optimized out>, mailbox=<optimized out>, 
conn=0x55d3f804a9e0) at master-connection.c:205
#29 master_connection_input_line (line=<optimized out>, conn=0x55d3f804a9e0) at 
master-connection.c:247
#30 master_connection_input (conn=0x55d3f804a9e0) at master-connection.c:287
#31 0x00007f88b711d5d5 in io_loop_call_io (io=0x55d3f804aa20) at ioloop.c:698
#32 0x00007f88b711efd9 in io_loop_handler_run_internal 
(ioloop=ioloop@entry=0x55d3f803fc90) at ioloop-epoll.c:221
#33 0x00007f88b711d6e6 in io_loop_handler_run (ioloop=<optimized out>) at 
ioloop.c:750
#34 0x00007f88b711d8f8 in io_loop_run (ioloop=0x55d3f803fc90) at ioloop.c:723
#35 0x00007f88b7091d43 in master_service_run (service=0x55d3f803fb20, 
callback=<optimized out>) at master-service.c:781
#36 0x000055d3f72d3fea in main (argc=<optimized out>, argv=<optimized out>) at 
indexer-worker.c:77













#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = {__val = {0, 51539607553, 0, 140735471290960, 3, 0, 
7233170478761014387, 109330211561823, 140735471296096, 140735471295616, 
140735471296104, 0, 140735471296120, 0, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x00007f88b6cc742a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7f88b702d520 
<_IO_2_1_stderr_>, sa_sigaction = 0x7f88b702d520 <_IO_2_1_stderr_>}, sa_mask = 
{__val = {3432, 140225162676480, 140225162679360, 140225162696099, 
140225159383906, 14, 1, 10, 94369104460544, 140735471292400, 0, 14, 
140225159391449, 140225162695968, 140225159392483, 
              140225162695968}}, sa_flags = -1246620992, sa_restorer = 
0x55d404f2fb00}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f88b5b240ad in __gnu_cxx::__verbose_terminate_handler() () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#3  0x00007f88b5b22066 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#4  0x00007f88b5b220b1 in std::terminate() () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#5  0x00007f88b5b222c9 in __cxa_throw () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#6  0x00007f88b5b227ec in operator new(unsigned long) () from 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#7  0x00007f88b5e681b6 in 
__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::allocate (this=<optimized out>, __n=1) at 
/usr/include/c++/6/ext/new_allocator.h:104
No locals.
#8  
std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > > 
>::allocate (__a=..., __n=1) at /usr/include/c++/6/bits/alloc_traits.h:436
No locals.
#9  std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_get_node (this=<optimized out>) at /usr/include/c++/6/bits/stl_tree.h:505
No locals.
#10 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_create_node<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (this=<optimized out>) at 
/usr/include/c++/6/bits/stl_tree.h:559
        __tmp = <optimized out>
#11 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node::operator()<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) const (this=<synthetic pointer>, 
__arg=<optimized out>) at /usr/include/c++/6/bits/stl_tree.h:473
No locals.
#12 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_insert_<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm>, 
std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node>(std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, 
std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&, 
std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_Alloc_node&) (__node_gen=<synthetic pointer>..., 
    __v=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>, __p=0x7f88b78c7010, __x=0x0, this=0x55d404f29c60) at 
/usr/include/c++/6/bits/stl_tree.h:1535
        __insert_left = <optimized out>
        __z = <optimized out>
#13 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm>, 
std::_Select1st<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> >, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::_M_insert_unique<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm> 
>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (this=this@entry=0x55d404f29c60, 
__v=__v@entry=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>) at /usr/include/c++/6/bits/stl_tree.h:1894
        __an = {_M_t = @0x55d404f29c60}
        __res = {first = 0x0, second = 0x7f88b78c7010}
#14 0x00007f88b5e67282 in std::map<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> >, OmDocumentTerm, 
std::less<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >, 
std::allocator<std::pair<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const, OmDocumentTerm> > 
>::insert<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>, 
void>(std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >, OmDocumentTerm>&&) (
    __x=<unknown type in 
/usr/lib/debug/.build-id/06/00dda3b082a5fe60d82405d2fcf81925604ddf.debug, CU 
0xdaa3c, DIE 0xe9f48>, this=<optimized out>) at 
/usr/include/c++/6/bits/stl_map.h:740
No locals.
#15 Xapian::Document::Internal::add_term (this=<optimized out>, 
tname="XMIDascoding.c", wdfinc=wdfinc@entry=1) at ../api/omdocument.cc:371
        i = <optimized out>
#16 0x00007f88b5e672f9 in Xapian::Document::add_term 
(this=this@entry=0x7fff87c611a0, tname="XMIDascoding.c", wdfinc=wdfinc@entry=1) 
at ../api/omdocument.cc:139
No locals.
#17 0x00007f88b622e9e6 in fts_backend_xapian_index_hdr (dbx=0x55d3f840f9f0, 
uid=<optimized out>, field=<optimized out>, data=data@entry=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", p=<optimized 
out>, f=<optimized out>) at fts-backend-xapian-functions.cpp:661
        i = 190
        u = 
"XMIDascoding.c\000om\000\000com\000\000\000\307\360d\363S\247\005\237D?\267\210\177\000\000\210\370J\267\210\177\000\000\200\023Ƈ\003\000\000\000\000\307\360d\363S\247\005x\023Ƈ\377\177\000\000x\023Ƈ\377\177\000\000\237D?\267\210\177\000\000P\371J\267\210\177\000\000\340\224\071\370\323U\000\000\004\000\000\000\000\000\000\000\237D?\267\210\177\000\000\022\312J\267\210\177\000\000\300\023Ƈ\377\177\000\000\060\360\030\370\323U\000\000\237D?\267\210\177\000\000\304\061I\267\210\177\000\000\264\016\266\264\210\177\000\000\000\307\360d\363S\247\005\020\000\000\000\342~`Z\000\307\360d\363S\247\005\237D?\267\210\177\000\000\213\371J\267"...
        docid = 1869
        xhs = {size = 238, partial = 2, full = 20, data = 0x55d404f22740}
        xq = {size = 1, tsize = 1, hsize = 1, data = 0x55d404f046c0, header = 
0x55d404eecea0, terms = 0x55d404ea8b20, hdrs = 0x55d404ee9ea0, is_and = false, 
is_global = false, limit = 1}
        result = <optimized out>
        doc = {internal = {px = 0x55d404f29bf0}}
        h = 0x7f88b6235566 "XMID"
#18 0x00007f88b62325d6 in fts_backend_xapian_update_build_more 
(_ctx=0x55d3f827ef80, data=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", 
size=<optimized out>) at fts-backend-xapian.cpp:330
        ctx = 0x55d3f827ef80
        backend = <optimized out>
        s = 0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID"
#19 0x00007f88b66439a8 in fts_build_data (ctx=ctx@entry=0x7fff87c61820, 
data=0x55d40433af50 
"<4f31eb5f-7fcb-478d-91d0-12c0ae75a...@iwascoding.com>MESSAGE-ID", size=53, 
last=last@entry=true) at fts-build-mail.c:425
No locals.
#20 0x00007f88b66441f7 in fts_build_unstructured_header (hdr=<optimized out>, 
hdr=<optimized out>, ctx=0x7fff87c61820) at fts-build-mail.c:103
        data = <optimized out>
        buf = <optimized out>
        i = <optimized out>
        ret = <optimized out>
#21 fts_build_mail_header (block=0x7fff87c617b0, block=0x7fff87c617b0, 
ctx=0x7fff87c61820) at fts-build-mail.c:178
        hdr = <optimized out>
        key = {uid = 2021, type = FTS_BACKEND_BUILD_KEY_HDR, part = 
0x55d3f8039ee8, hdr_name = 0x55d40433af85 "MESSAGE-ID", body_content_type = 
0x0, body_content_disposition = 0x0}
        ret = <optimized out>
#22 fts_build_mail_real (may_need_retry_r=0x7fff87c61763, 
retriable_err_msg_r=0x7fff87c61770, mail=0x55d3f81ca5b8, 
update_ctx=0x55d3f827ef80) at fts-build-mail.c:568
        block = {part = 0x55d3f8039ee8, hdr = 0x55d404d458f8, data = 
0x7f88b73f449f <__x86_return_thunk+5> 
"\363\220\017\256\350\353\371H\215d$\b\303\017\037@", size = 0}
        ret = <optimized out>
        input = 0x55d404ccc7d0
---Type <return> to continue, or q <return> to quit---
        raw_block = {part = 0x55d3f8039ee8, hdr = 0x55d404eda050, data = 0x0, 
size = 0}
        skip_body = <optimized out>
        ctx = {mail = 0x55d3f81ca5b8, update_ctx = 0x55d3f827ef80, content_type 
= 0x55d404ec2ac0 "multipart/signed", content_disposition = 0x0, body_parser = 
0x0, word_buf = 0x0, pending_input = 0x0, cur_user_lang = 0x0}
        prev_part = <optimized out>
        parser = 0x55d4046972b8
        decoder = 0x55d404d458e0
        parts = 0x55d404f10eb0
        body_part = <optimized out>
        body_added = false
        binary_body = <optimized out>
        error = 0x7e5 <error: Cannot access memory at address 0x7e5>
#23 fts_build_mail (update_ctx=0x55d3f827ef80, mail=mail@entry=0x55d3f81ca5b8) 
at fts-build-mail.c:617
        _data_stack_cur_id = 6
        attempts = 2
        retriable_err_msg = 0x7f88b73f449f <__x86_return_thunk+5> 
"\363\220\017\256\350\353\371H\215d$\b\303\017\037@"
        may_need_retry = false
#24 0x00007f88b664b6c3 in fts_mail_index (_mail=0x55d3f81ca5b8) at 
fts-storage.c:538
        ft = 0x55d3f83b35f0
        flist = 0x55d3f835e800
        pmail = 0x55d3f81ca5b8
#25 fts_mail_precache (_mail=0x55d3f81ca5b8) at fts-storage.c:559
        _data_stack_cur_id = 5
        mail = 0x55d3f81ca5b8
        fmail = <optimized out>
        ft = 0x55d3f83b35f0
        __func__ = "fts_mail_precache"
#26 0x00007f88b73f5d6a in mail_precache (mail=0x55d3f81ca5b8) at mail.c:424
        _data_stack_cur_id = 4
        p = 0x55d3f81ca5b8
#27 0x000055d3f72d4603 in index_mailbox_precache (conn=0x55d3f804a9e0, 
box=0x55d3f829eb48) at master-connection.c:102
        counter = 1868
        max = 2987
        percentage_sent = 60
        storage = <optimized out>
        status = {messages = 2987, recent = 0, unseen = 0, uidvalidity = 
1451492221, uidnext = 3282, first_unseen_seq = 0, first_recent_uid = 3282, 
last_cached_seq = 0, highest_modseq = 0, highest_pvt_modseq = 0, keywords = 
0x0, permanent_flags = 0, flags = 0, permanent_keywords = false, 
allow_new_keywords = false, 
          nonpermanent_modseqs = false, no_modseq_tracking = false, have_guids 
= true, have_save_guids = true, have_only_guid128 = false}
        uids = <optimized out>
        username = 0x55d3f85cd510 "p...@iwascoding.com"
        first_uid = 1
        percentage_str = "60\n"
        percentage = <optimized out>
        error = 32648
        trans = 0x55d3f83e6620
        ctx = 0x55d3f8267f20
        last_uid = <optimized out>
        ret = 0
        box_vname = 0x55d3f829ee70 "sent"
        errstr = <optimized out>
        search_args = 0x0
        mail = 0x55d3f81ca5b8
        metadata = {guid = '\000' <repeats 15 times>, virtual_size = 0, 
physical_size = 0, first_save_date = 0, cache_fields = 0x0, 
          precache_fields = (MAIL_FETCH_STREAM_HEADER | MAIL_FETCH_STREAM_BODY 
| MAIL_FETCH_RECEIVED_DATE | MAIL_FETCH_SAVE_DATE | MAIL_FETCH_PHYSICAL_SIZE | 
MAIL_FETCH_VIRTUAL_SIZE | MAIL_FETCH_UIDL_BACKEND | MAIL_FETCH_GUID | 
MAIL_FETCH_POP3_ORDER), backend_ns_prefix = 0x0, backend_ns_type = (unknown: 0)}
        seq = <optimized out>
#28 index_mailbox (user=<optimized out>, user=<optimized out>, what=<optimized 
out>, max_recent_msgs=<optimized out>, mailbox=<optimized out>, 
conn=0x55d3f804a9e0) at master-connection.c:205
        box = 0x55d3f829eb48
        status = {messages = 0, recent = 0, unseen = 0, uidvalidity = 0, 
uidnext = 91, first_unseen_seq = 110, first_recent_uid = 0, last_cached_seq = 
0, highest_modseq = 0, highest_pvt_modseq = 532575944823, keywords = 0x10, 
permanent_flags = 3070413568, flags = 32648, permanent_keywords = false, 
allow_new_keywords = false, 
          nonpermanent_modseqs = false, no_modseq_tracking = false, have_guids 
= true, have_save_guids = true, have_only_guid128 = false}
        errstr = <optimized out>
        ret = 0
        ns = <optimized out>
        path = 0x55d3f80393a8 
"/var/spool/mail/iwascoding/paul/mdbox/mailboxes/sent/dbox-Mails"
        error = 2987
        sync_flags = <optimized out>
#29 master_connection_input_line (line=<optimized out>, conn=0x55d3f804a9e0) at 
master-connection.c:247
        str = <optimized out>
        max_recent_msgs = 0
        ret = <optimized out>
        args = <optimized out>
        input = {parent_event = 0x0, module = 0x55d3f72d4e1f "mail", service = 
0x55d3f72d4e10 "indexer-worker", username = 0x55d3f8037038 
"p...@iwascoding.com", session_id = 0x0, session_id_prefix = 0x0, 
session_create_time = 0, local_ip = {family = 0, u = {ip6 = {__in6_u = 
{__u6_addr8 = '\000' <repeats 15 times>, __u6_addr16 = {0, 0, 0, 
                    0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0, 0}}}, ip4 = {s_addr 
= 0}}}, remote_ip = {family = 0, u = {ip6 = {__in6_u = {__u6_addr8 = '\000' 
<repeats 15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 
0, 0, 0}}}, ip4 = {s_addr = 0}}}, local_port = 0, remote_port = 0, 
userdb_fields = 0x0, 
          flags_override_add = (unknown: 0), flags_override_remove = (unknown: 
0), no_userdb_lookup = false, debug = false, conn_secured = false, 
conn_ssl_secured = false}
        service_user = 0x55d3f804d7d8
        user = 0x55d3f85cd3f8
        error = 0x0
#30 master_connection_input (conn=0x55d3f804a9e0) at master-connection.c:287
        _data_stack_cur_id = 3
        line = <optimized out>
#31 0x00007f88b711d5d5 in io_loop_call_io (io=0x55d3f804aa20) at ioloop.c:698
        ioloop = 0x55d3f803fc90
        t_id = 2
        __func__ = "io_loop_call_io"
#32 0x00007f88b711efd9 in io_loop_handler_run_internal 
(ioloop=ioloop@entry=0x55d3f803fc90) at ioloop-epoll.c:221
        ctx = 0x55d3f8041330
        io = <optimized out>
        tv = {tv_sec = 2147483, tv_usec = 0}
---Type <return> to continue, or q <return> to quit---
        events_count = <optimized out>
        msecs = <optimized out>
        ret = 1
        i = 0
        j = <optimized out>
        call = <optimized out>
        __func__ = "io_loop_handler_run_internal"
#33 0x00007f88b711d6e6 in io_loop_handler_run (ioloop=<optimized out>) at 
ioloop.c:750
No locals.
#34 0x00007f88b711d8f8 in io_loop_run (ioloop=0x55d3f803fc90) at ioloop.c:723
        __func__ = "io_loop_run"
#35 0x00007f88b7091d43 in master_service_run (service=0x55d3f803fb20, 
callback=<optimized out>) at master-service.c:781
No locals.
#36 0x000055d3f72d3fea in main (argc=<optimized out>, argv=<optimized out>) at 
indexer-worker.c:77
        storage_service_flags = (MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP | 
MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP | 
MAIL_STORAGE_SERVICE_FLAG_NO_IDLE_TIMEOUT)
        c = <optimized out>


> On 14. Jan 2019, at 11:07, Stephan Bosch <step...@rename-it.nl> wrote:
> 
> 
> Op 14-1-2019 om 10:55 schreef Paul Hecker via dovecot:
>> OK, got it (my fault, as always, put the LimitCORE in the wrong line). Here 
>> is the stack trace:
>> 
> If you want to get rid of those "??" stack trace elements, you'll need to 
> install debug symbols for the xapian library. It depends on your system how 
> to do that (usually some separate package).
> 
> 
> Regards,
> 
> Stephan.
> 
> 
>> 
>> 
>>> On 14. Jan 2019, at 10:33, Joan Moreau via dovecot <dovecot@dovecot.org 
>>> <mailto:dovecot@dovecot.org>> wrote:
>>> 
>>> Difficult to figure out without a coredump + gdb
>>> 
>>> 
>>> I have also battled quite a lot to make sure dovecot can core dump on my 
>>> Archlinux servers.
>>> 
>>> I remember that the key point was putting*fs.suid_dumpable=2* in 
>>> /etc/sysctl.d/ conf files, *LimitCORE=infinity* in 
>>> /etc/systemd/system/multi-user.target.wants/dovecot.service,  and rebooting 
>>> the server.
>>> 
>>> My own coredumps are on /var/lib/systemd/coredump/
>>> 
>>> 
>> 

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