samba panic or segfault

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The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for PID 3147 (/usr/sbin/smbd).

This means there was a problem with the program, such as a segfault.
Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occurred. The Samba log
files may contain additional information about the problem.

If the problem persists, you are encouraged to first install the
samba-dbg package, which contains the debugging symbols for the Samba
binaries. Then submit the provided information as a bug report to
Ubuntu by visiting this link:
https://launchpad.net/ubuntu/+source/samba/+filebug

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f83d82f37ea in __GI___waitpid (pid=3148, stat_loc=stat_loc@entry=0x7ffdabb94bd0, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:31
#0 0x00007f83d82f37ea in __GI___waitpid (pid=3148, stat_loc=stat_loc@entry=0x7ffdabb94bd0, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:31
#1 0x00007f83d826cffb in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:148
#2 0x00007f83d9c16251 in smb_panic_s3 () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
#3 0x00007f83db361b7f in smb_panic () from /usr/lib/x86_64-linux-gnu/libsamba-util.so.0
#4 0x00007f83db361d96 in ?? () from /usr/lib/x86_64-linux-gnu/libsamba-util.so.0
#5 <signal handler called>
#6 0x00007f83daf73aa5 in smbXsrv_session_create () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#7 0x00007f83daf0f966 in reply_sesssetup_and_X () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#8 0x00007f83daf4a558 in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#9 0x00007f83daf4b9c1 in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#10 0x00007f83daf4bc0b in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#11 0x00007f83d9c2c837 in run_events_poll () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
#12 0x00007f83d9c2ca97 in ?? () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
#13 0x00007f83d85f6a4d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#14 0x00007f83daf4d0dd in smbd_process () from /usr/lib/x86_64-linux-gnu/samba/libsmbd_base.so.0
#15 0x000055959f935120 in ?? ()
#16 0x00007f83d9c2c837 in run_events_poll () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
#17 0x00007f83d9c2ca97 in ?? () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
#18 0x00007f83d85f6a4d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#19 0x000055959f931e62 in main ()
A debugging session is active.

 Inferior 1 [process 3147] will be detached.