[Samba] Receiving SMB: Server stopped responding

[Jeremy Allison]

On Thu, Aug 28, 2008 at 10:59:50AM -0500, Jason A. Nunnelley wrote:
> This seems to be an ongoing, never-ending problem with our installation of 
> Samba 3.0.31, patched, running in FreeBSD 7.0 Stable RELENG updated.
> 
> tail -f /var/log/samba/winbindd.log
> 
> [2008/08/28 10:26:31, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
>   Receiving SMB: Server stopped responding
> [2008/08/28 10:26:43, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
>   Receiving SMB: Server stopped responding
> [2008/08/28 10:26:56, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
>   Receiving SMB: Server stopped responding
> 
> And, it seems to be both periodical at times, then completely random.  The 
> thing just stops responding to winbinds for no logged reason.
> 
> Is there any way to get Samba to tell me what the devil it's doing while 
> it's busy ignoring everything?

Attach to the process with gdb and get a backtrace.

> So long as network use is light, there's no problem.  I also wonder if it's 
> possible that it just decides to stop responding under some particular 
> amount of arbitrary load, or perhaps the NIC's bandwidth being close to max 
> causes it to lock up.  I'm grasping at straws.  I've got well over 50 hours 
> in troubleshooting this thing and no real leads on why it's periodically 
> just refusing connections... then coming back with no fanfare.

When you say "locks up" do you mean Samba or the OS ?