#0  0x00007fdea7acf425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fdea7ad2b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007fdea925bae0 in dump_core () at ../source3/lib/dumpcore.c:336
#3  0x00007fdea9249a8c in smb_panic_s3 (why=0x7fdeaaed669d "internal error")
    at ../source3/lib/util.c:808
#4  0x00007fdeaaec2fc8 in smb_panic (why=0x7fdeaaed669d "internal error")
    at ../lib/util/fault.c:159
#5  0x00007fdeaaec2cab in fault_report (sig=11) at ../lib/util/fault.c:77
#6  0x00007fdeaaec2cc0 in sig_fault (sig=11) at ../lib/util/fault.c:88
#7  <signal handler called>
#8  0x00007fdeaaab449d in to_8_3 ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#9  0x00007fdeaaab491f in hash_name_to_8_3 ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#10 0x00007fdeaaab3133 in name_to_8_3 ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#11 0x00007fdeaaa14c0f in smbd_marshall_dir_entry ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#12 0x00007fdeaaa155e4 in smbd_dirptr_lanman2_entry ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#13 0x00007fdeaaa9cf0c in smbd_smb2_find_send ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#14 0x00007fdeaaa9c10d in smbd_smb2_request_process_find ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#15 0x00007fdeaaa83056 in smbd_smb2_request_dispatch ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#16 0x00007fdeaaa83f09 in smbd_smb2_request_dispatch_immediate ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#17 0x00007fdeaa705e48 in tevent_common_loop_immediate ()
   from /usr/local/samba4/lib/private/libtevent.so.0
#18 0x00007fdea926622b in run_events_poll (ev=0x7fdeabf387f0, pollrtn=0, 
    pfds=0x0, num_pfds=0) at ../source3/lib/events.c:192
#19 0x00007fdea92668d3 in s3_event_loop_once (ev=0x7fdeabf387f0, 
    location=0x7fdeaabe92d8 "../source3/smbd/process.c:3695")
    at ../source3/lib/events.c:303
#20 0x00007fdeaa704f5f in _tevent_loop_once ()
   from /usr/local/samba4/lib/private/libtevent.so.0
#21 0x00007fdeaaa661bd in smbd_process ()
   from /usr/local/samba4/lib/private/libsmbd_base.so
#22 0x00007fdeab52facd in smbd_accept_connection (ev=0x7fdeabf387f0, 
    fde=0x7fdeac75f580, flags=1, private_data=0x7fdeac43e660)
    at ../source3/smbd/server.c:628
#23 0x00007fdea9266717 in run_events_poll (ev=0x7fdeabf387f0, pollrtn=1, 
    pfds=0x7fdeacbb5880, num_pfds=8) at ../source3/lib/events.c:257
#24 0x00007fdea92669e4 in s3_event_loop_once (ev=0x7fdeabf387f0, 
    location=0x7fdeab53417e "../source3/smbd/server.c:954")
    at ../source3/lib/events.c:326
#25 0x00007fdeaa704f5f in _tevent_loop_once ()
   from /usr/local/samba4/lib/private/libtevent.so.0
#26 0x00007fdeab530714 in smbd_parent_loop (ev_ctx=0x7fdeabf387f0, 
    parent=0x7fdeabf44e00) at ../source3/smbd/server.c:954
#27 0x00007fdeab531d07 in main (argc=5, argv=0x7fff1b4ba088)
    at ../source3/smbd/server.c:1586