Public bug reported:

Binary package hint: samba

Using samba on AD.

Changes made from the time that it was working to now:

- added to smb.conf:

   use kerberos keytab = True

- re-ran 'net join'

Files are still accessable.  Authentication still works.  I have not yet
noticed anything other than the following email I receive every time a
file is accessed:

The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for pid 23905 (/usr/sbin/smbd).

Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occurred. 

If the problem persists, you are encouraged to first install the 
samba-dbg package which contains the debugging symbols for samba 
binaries. Then, submit the provided information as a bug report to Ubuntu.
For information about the procedure for submitting bug reports, please
see http://www.ubuntulinux.org/support/bugs/document_view

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1213310368 (LWP 23905)]
0xffffe410 in __kernel_vsyscall ()
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7c1d933 in waitpid () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7bc73c9 in strtold_l () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7d2e7dd in system () from /lib/tls/i686/cmov/libpthread.so.0
#4  0x081fff83 in smb_panic2 (
    why=0xfffffe00 <Address 0xfffffe00 out of bounds>, decrement_pid_count=1)
    at lib/util.c:1545
#5  0x082000a5 in smb_panic (why=0xfffffe00 <Address 0xfffffe00 out of bounds>)
    at lib/util.c:1506
#6  0x081ee1b5 in sig_fault (sig=-512) at lib/fault.c:42
#7  <signal handler called>
#8  0xb7becffb in fseek () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7e471fc in krb5_ktfile_get_next () from /usr/lib/libkrb5.so.3
#10 0xb7e45b4c in krb5_kt_next_entry () from /usr/lib/libkrb5.so.3
#11 0x0827a9f5 in ads_verify_ticket (mem_ctx=0x8358bd0, realm=0x0, 
    ticket=0xbf903558, principal=0x8396bc0, pac_data=0xbf903580, 
    ap_rep=0xbf90354c, session_key=0xbf903528) at libads/kerberos_verify.c:92
#12 0x080b4670 in reply_spnego_negotiate (conn=0x0, inbuf=0xb76c9008 "", 
    outbuf=0xb76a8008 "", vuid=102, length=1372, bufsize=131072, blob1=
      {data = 0x83af420 "`\202\004³\006\006+\006\001\005\005\002 
\202\004§0\202\004£ 
$0\"\006\t*\206H\202÷\022\001\002\002\006\t*\206H\206÷\022\001\002\002\006\n+\006\001\004\001\2027\002\002\n¢\202\004y\004\202\004u`\202\004q\006\t*\206H\206÷\022\001\002\002\001",
 length = 1207, free = 0x81fdd40 <free_data_blob>}, 
    auth_ntlmssp_state=0x83afd28) at smbd/sesssetup.c:192
#13 0x080b697b in reply_sesssetup_and_X (conn=0x0, inbuf=0xb76c9008 "", 
    outbuf=0xb76a8008 "", length=1372, bufsize=131072) at smbd/sesssetup.c:694
#14 0x080de63d in switch_message (type=115, inbuf=0xb76c9008 "", 
    outbuf=0xb76a8008 "", size=1372, bufsize=0) at smbd/process.c:1071
#15 0x080de9e9 in process_smb (inbuf=0xb76c9008 "", outbuf=0xb76a8008 "")
    at smbd/process.c:1101
#16 0x080df846 in smbd_process () at smbd/process.c:1753
#17 0x0828b593 in main (argc=0, argv=0xbf9059c4) at smbd/server.c:976

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

-- 
Segfault in Samba (kerberos related)
https://launchpad.net/bugs/71836

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