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[Launchpad Bug Tracker <1827924@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package samba - 2:4.3.11+dfsg-
0ubuntu0.16.04.21

---------------
samba (2:4.3.11+dfsg-0ubuntu0.16.04.21) xenial-security; urgency=medium

  * SECURITY REGRESSION: panics following recent update (LP: #1827924)
    - debian/patches/bug13315.patch: do not crash if we fail to init the
      session table in source3/smbd/negprot.c.

 -- Marc Deslauriers <marc.deslauriers@xxxxxxxxxx>  Thu, 23 May 2019
08:08:58 -0400

** Changed in: samba (Ubuntu Xenial)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1827924

Title:
  Panic or segfault in Samba

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Confirmed
Status in samba source package in Xenial:
  Fix Released
Status in samba source package in Bionic:
  Confirmed

Bug description:
  The Samba 'panic action' script, /usr/share/samba/panic-action,
  was called for PID 8336 (/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".
  0x00007f892084507a in __GI___waitpid (pid=8341, stat_loc=stat_loc@entry=0x7ffcd9196290, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
  #0  0x00007f892084507a in __GI___waitpid (pid=8341, stat_loc=stat_loc@entry=0x7ffcd9196290, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
  #1  0x00007f89207bdfbb in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:148
  #2  0x00007f89232698d1 in smb_panic_s3 () from /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0
  #3  0x00007f8923fdcf1f in smb_panic () from /usr/lib/x86_64-linux-gnu/libsamba-util.so.0
  #4  0x00007f8923fdd136 in ?? () from /usr/lib/x86_64-linux-gnu/libsamba-util.so.0
  #5  <signal handler called>
  #6  0x00007f8923bd5c6f in smbXsrv_session_create () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #7  0x00007f8923b6e643 in reply_sesssetup_and_X () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #8  0x00007f8923baae67 in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #9  0x00007f8923bacbb3 in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #10 0x00007f8923bae21c in ?? () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #11 0x00007f8921efc917 in run_events_poll () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
  #12 0x00007f8921efcb77 in ?? () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
  #13 0x00007f8920b46d3d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
  #14 0x00007f8920b46edb in tevent_common_loop_wait () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
  #15 0x00007f8923baf578 in smbd_process () from /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0
  #16 0x00005585ef73fe12 in ?? ()
  #17 0x00007f8921efc917 in run_events_poll () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
  #18 0x00007f8921efcb77 in ?? () from /usr/lib/x86_64-linux-gnu/libsmbconf.so.0
  #19 0x00007f8920b46d3d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
  #20 0x00007f8920b46edb in tevent_common_loop_wait () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
  #21 0x00005585ef73e099 in main ()
  A debugging session is active.

          Inferior 1 [process 8336] will be detached.

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