Comment 7 for bug 281188

Same here:

The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for PID 16283 (/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

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[Thread debugging using libthread_db enabled]
[New Thread 0xb756c6d0 (LWP 16283)]
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0xb7a9d430 in __kernel_vsyscall ()
#0 0xb7a9d430 in __kernel_vsyscall ()
#1 0xb76b0733 in waitpid () from /lib/tls/i686/cmov/libc.so.6
#2 0xb764d78b in ?? () from /lib/tls/i686/cmov/libc.so.6
#3 0xb784050d in system () from /lib/tls/i686/cmov/libpthread.so.0
#4 0xb7c6c5c1 in smb_panic () from /usr/sbin/smbd
#5 0xb7c56f93 in ?? () from /usr/sbin/smbd
#6 <signal handler called>
#7 0xb7c486a0 in rep_strlcpy () from /usr/sbin/smbd
#8 0xb7c7b662 in connections_fetch_entry () from /usr/sbin/smbd
#9 0xb7b1d2a0 in yield_connection () from /usr/sbin/smbd
#10 0xb7b45e5d in close_cnum () from /usr/sbin/smbd
#11 0xb7e9867d in reply_tdis () from /usr/sbin/smbd
#12 0xb7b4330e in ?? () from /usr/sbin/smbd
#13 0xb7b45521 in smbd_process () from /usr/sbin/smbd
#14 0xb7b0cb4f in main () from /usr/sbin/smbd
The program is running. Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]