Please run it under gdb and also enable more debug output:

$ killall syncevo-dbus-server
$ script /tmp/log
Script started, file is /tmp/log
$ gdb --args /usr/libexec/syncevo-dbus-server -o -s --verbosity=3
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/libexec/syncevo-dbus-server...done.
(gdb) run
Starting program: /usr/libexec/syncevo-dbus-server -o -s --verbosity=3
warning: no loadable sections found in added symbol-file system-supplied DSO at
0x7ffff7ffa000
....

If it crashes, please run "thread apply all bt".

Once it is done, please attach the /tmp/log file.