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[Frederic BUISSON <1818638@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Samba crash sometimes with this message :
I don't understand what is the event which make it crash. 
The clients for Samba are on Windows 7 and 10.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007fb966bc607a in __GI___waitpid (pid=4502, stat_loc=stat_loc@entry=0x7ffd1e1b7a10, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
#0  0x00007fb966bc607a in __GI___waitpid (pid=4502, stat_loc=stat_loc@entry=0x7ffd1e1b7a10, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
#1  0x00007fb966b3efbb in do_system (line=line@entry=0x559a1fdfc200 "/usr/share/samba/panic-action 4501") at ../sysdeps/posix/system.c:148
#2  0x00007fb966b3f39a in __libc_system (line=line@entry=0x559a1fdfc200 "/usr/share/samba/panic-action 4501") at ../sysdeps/posix/system.c:184
#3  0x00007fb9695ea8d1 in smb_panic_s3 (why=<optimized out>) at ../source3/lib/util.c:802
#4  0x00007fb96a35df1f in smb_panic (why=why@entry=0x7fb96a3a1ab8 "internal error") at ../lib/util/fault.c:166
#5  0x00007fb96a35e136 in fault_report (sig=<optimized out>) at ../lib/util/fault.c:83
#6  sig_fault (sig=<optimized out>) at ../lib/util/fault.c:94
#7  <signal handler called>
#8  smbXsrv_session_create (conn=conn@entry=0x559a1fddd850, now=now@entry=131962556254820770, _session=_session@entry=0x7ffd1e1b83c0) at ../source3/smbd/smbXsrv_session.c:1158
#9  0x00007fb969eef643 in reply_sesssetup_and_X (req=req@entry=0x559a1fdfa5f0) at ../source3/smbd/sesssetup.c:953
#10 0x00007fb969f2be67 in switch_message (type=<optimized out>, req=req@entry=0x559a1fdfa5f0) at ../source3/smbd/process.c:1649
#11 0x00007fb969f2dbb3 in construct_reply (deferred_pcd=0x0, encrypted=false, seqnum=0, unread_bytes=0, size=76, inbuf=0x0, xconn=0x559a1fddd850) at ../source3/smbd/process.c:1685
#12 process_smb (xconn=xconn@entry=0x559a1fddd850, inbuf=<optimized out>, nread=76, unread_bytes=0, seqnum=0, encrypted=<optimized out>, deferred_pcd=0x0) at ../source3/smbd/process.c:1932
#13 0x00007fb969f2f21c in smbd_server_connection_read_handler (xconn=0x559a1fddd850, fd=40) at ../source3/smbd/process.c:2531
#14 0x00007fb96827d917 in run_events_poll (ev=0x559a1fddd120, pollrtn=<optimized out>, pfds=0x559a1fdf7870, num_pfds=4) at ../source3/lib/events.c:257
#15 0x00007fb96827db77 in s3_event_loop_once (ev=0x559a1fddd120, location=<optimized out>) at ../source3/lib/events.c:326
#16 0x00007fb966ec7d3d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#17 0x00007fb966ec7edb in tevent_common_loop_wait () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#18 0x00007fb969f30578 in smbd_process (ev_ctx=0x559a1fddd120, msg_ctx=<optimized out>, sock_fd=40, interactive=<optimized out>) at ../source3/smbd/process.c:4032
#19 0x0000559a1ea83e12 in smbd_accept_connection (ev=0x559a1fddd120, fde=<optimized out>, flags=<optimized out>, private_data=<optimized out>) at ../source3/smbd/server.c:646
#20 0x00007fb96827d917 in run_events_poll (ev=0x559a1fddd120, pollrtn=<optimized out>, pfds=0x559a1fdf7870, num_pfds=6) at ../source3/lib/events.c:257
#21 0x00007fb96827db77 in s3_event_loop_once (ev=0x559a1fddd120, location=<optimized out>) at ../source3/lib/events.c:326
#22 0x00007fb966ec7d3d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#23 0x00007fb966ec7edb in tevent_common_loop_wait () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#24 0x0000559a1ea82099 in smbd_parent_loop (parent=0x559a1fddf700, ev_ctx=0x559a1fddd120) at ../source3/smbd/server.c:1011
#25 main (argc=<optimized out>, argv=<optimized out>) at ../source3/smbd/server.c:1663
A debugging session is active.

Description:    Ubuntu 16.04.6 LTS
Release:        16.04


syslog :
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.439809,  0] ../source3/smbd/negprot.c:686(reply_negprot)
Mar  5 11:33:45 ServeurDev smbd[4501]:   No protocol supported !
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.483363,  0] ../lib/util/fault.c:78(fault_report)
Mar  5 11:33:45 ServeurDev smbd[4501]:   ===============================================================
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.483416,  0] ../lib/util/fault.c:79(fault_report)
Mar  5 11:33:45 ServeurDev smbd[4501]:   INTERNAL ERROR: Signal 11 in pid 4501 (4.3.11-Ubuntu)
Mar  5 11:33:45 ServeurDev smbd[4501]:   Please read the Trouble-Shooting section of the Samba HOWTO
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.483441,  0] ../lib/util/fault.c:81(fault_report)
Mar  5 11:33:45 ServeurDev smbd[4501]:   ===============================================================
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.483458,  0] ../source3/lib/util.c:789(smb_panic_s3)
Mar  5 11:33:45 ServeurDev smbd[4501]:   PANIC (pid 4501): internal error
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.484348,  0] ../source3/lib/util.c:900(log_stack_trace)
Mar  5 11:33:45 ServeurDev smbd[4501]:   BACKTRACE: 23 stack frames:
Mar  5 11:33:45 ServeurDev smbd[4501]:    #0 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(log_stack_trace+0x1a) [0x7fb9695ea7aa]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #1 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(smb_panic_s3+0x20) [0x7fb9695ea880]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7fb96a35df1f]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x1b136) [0x7fb96a35e136]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390) [0x7fb96a5bc390]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbXsrv_session_create+0x3f) [0x7fb969f56c6f]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(reply_sesssetup_and_X+0x923) [0x7fb969eef643]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x112e67) [0x7fb969f2be67]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #8 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x114bb3) [0x7fb969f2dbb3]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #9 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x11621c) [0x7fb969f2f21c]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x167) [0x7fb96827d917]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x2cb77) [0x7fb96827db77]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x8d) [0x7fb966ec7d3d]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7fb966ec7edb]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x718) [0x7fb969f30578]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #15 /usr/sbin/smbd(+0x8e12) [0x559a1ea83e12]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x167) [0x7fb96827d917]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x2cb77) [0x7fb96827db77]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x8d) [0x7fb966ec7d3d]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7fb966ec7edb]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #20 /usr/sbin/smbd(main+0x1899) [0x559a1ea82099]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7fb966b1a830]
Mar  5 11:33:45 ServeurDev smbd[4501]:    #22 /usr/sbin/smbd(_start+0x29) [0x559a1ea82199]
Mar  5 11:33:45 ServeurDev smbd[4501]: [2019/03/05 11:33:45.484530,  0] ../source3/lib/util.c:801(smb_panic_s3)
Mar  5 11:33:45 ServeurDev smbd[4501]:   smb_panic(): calling panic action [/usr/share/samba/panic-action 4501]
Mar  5 11:33:46 ServeurDev smbd[4501]: [2019/03/05 11:33:46.928620,  0] ../source3/lib/util.c:809(smb_panic_s3)
Mar  5 11:33:46 ServeurDev smbd[4501]:   smb_panic(): action returned status 0
Mar  5 11:33:46 ServeurDev smbd[4501]: [2019/03/05 11:33:46.928743,  0] ../source3/lib/dumpcore.c:303(dump_core)
Mar  5 11:33:46 ServeurDev smbd[4501]:   dumping core in /var/log/samba/cores/smbd
Mar  5 11:33:46 ServeurDev smbd[4501]:


configuration :
 obey pam restrictions = yes
 unix password sync = yes

package :

Paquet : samba
État: installé
Automatiquement installé: non
Version : 2:4.3.11+dfsg-0ubuntu0.16.04.18
Priorité : optionnel
Section : net
Responsable : Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
Architecture : amd64
Taille décompressée : 11,5 M
Dépend: adduser, libpam-modules, libpam-runtime (>= 1.0.1-11), lsb-base (>= 4.1+Debian11ubuntu7), procps, python (>= 2.7), python-dnspython, python-samba, samba-common (= 2:4.3.11+dfsg-0ubuntu0.16.04.18), samba-common-bin (=
        2:4.3.11+dfsg-0ubuntu0.16.04.18), tdb-tools, update-inetd, python (< 2.8), python2.7:any, libbsd0 (>= 0.0), libc6 (>= 2.14), libldb1 (>= 0.9.21), libpopt0 (>= 1.14), libpython2.7 (>= 2.7), libtalloc2 (>= 2.0.4~git20101213),
        libtdb1 (>= 1.2.7+git20101214), libtevent0 (>= 0.9.16), libwbclient0 (= 2:4.3.11+dfsg-0ubuntu0.16.04.18), samba-libs (= 2:4.3.11+dfsg-0ubuntu0.16.04.18)
Pré-dépend: dpkg (>= 1.15.6~)
Recommande: attr, logrotate, samba-dsdb-modules, samba-vfs-modules
Suggère: bind9 (>= 1:9.5.1), bind9utils, ctdb, ldb-tools, ntp, smbldap-tools, winbind, ufw
Est en conflit: libldb1 (< 1:1.1.15), libldb1:i386 (< 1:1.1.15), samba (< 2:3.3.0~rc2-5), samba:i386 (< 2:3.3.0~rc2-5), samba-ad-dc, samba-doc (< 2:4.0.5~), samba-tools, samba4 (< 4.0.0~alpha6-2), samba:i386
Casse: qtsmbstatus-server (< 2.2.1-3~), qtsmbstatus-server:i386 (< 2.2.1-3~)
Remplace: libsamdb0 (< 4.0.0~alpha17~), python-samba (< 2:4.1.4+dfsg-3), python-samba:i386 (< 2:4.1.4+dfsg-3), samba-ad-dc, samba-common (<= 2.0.5a-2), samba-common:i386 (<= 2.0.5a-2), samba-doc (< 2:4.0.5~), samba-libs (<
          2:4.1.4+dfsg-2), samba-libs:i386 (< 2:4.1.4+dfsg-2), samba4
Améliore: bind9, ntp

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1818638

Title:
  segfault on Samba v4.3.11-Ubuntu

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