The server runs with debian stable and a selfcompiled samba 3.0.1 as pdc.
I can't reconstruct the failure, because it's used every day.

error information follows:


mono@marvin:~$uname -a
Linux marvin 2.4.18-bf2.4 #1 Mon Apr 12 11:37:50 UTC 2004 i686 GNU/Linux


mono@marvin:~$ tail -n 100 /var/log/samba/log.
[2005/08/01 13:54:30, 1] libsmb/clispnego.c:parse_negTokenTarg(251)
  Failed to parse negTokenTarg at offset 44
[2005/08/01 13:54:30, 0] lib/fault.c:fault_report(36)
  ===============================================================
[2005/08/01 13:54:30, 0] lib/fault.c:fault_report(37)
  INTERNAL ERROR: Signal 11 in pid 32381 (3.0.1)
  Please read the appendix Bugs of the Samba HOWTO collection
[2005/08/01 13:54:30, 0] lib/fault.c:fault_report(39)
  ===============================================================
[2005/08/01 13:54:30, 0] lib/util.c:smb_panic(1390)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 32381]
[2005/08/01 13:54:31, 0] lib/util.c:smb_panic(1398)
  smb_panic(): action returned status 0
[2005/08/01 13:54:31, 0] lib/util.c:smb_panic(1400)
  PANIC: internal error
[2005/08/01 13:54:31, 0] lib/util.c:smb_panic(1408)
  BACKTRACE: 6 stack frames:
   #0 /usr/local/samba/sbin/smbd(smb_panic+0x195) [0x8185fb1]
   #1 /usr/local/samba/sbin/smbd [0x81764db]
   #2 /usr/local/samba/sbin/smbd [0x8176535]
   #3 /lib/libpthread.so.0 [0x402d3825]
   #4 /lib/libc.so.6 [0x401426f8]
   #5 /usr/local/samba/sbin/smbd [0x80a0d16]
[2005/08/01 13:56:14, 0] lib/util_sock.c:read_socket_data(342)
  read_socket_data: recv failure for 4287. Error = Connection timed out


the panic-script mails:
=======================
The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for pid 31973 (/usr/local/samba/sbin/smbd).

Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occured.  You are
encouraged to submit this information as a bug report to Debian.  For
information about the procedure for submitting bug reports , please see
http://www.debian.org/Bugs/Reporting or the reportbug(1) manpage.

Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 31973)]
0x401c0808 in waitpid () from /lib/libc.so.6
#0  0x401c0808 in waitpid () from /lib/libc.so.6
#1  0x40248880 in ?? () from /lib/libc.so.6
#2  0x401594c2 in strtold_l () from /lib/libc.so.6
#3  0x08185e91 in smb_panic ()
#4  0x081764db in fault_report ()
#5  0x08176535 in sig_fault ()
#6  0x402d3825 in __pthread_sighandler () from /lib/libpthread.so.0
#7  <signal handler called>
#8  0x08183fc6 in data_blob_free ()
#9  0x080a0d16 in reply_sesssetup_and_X_spnego ()