Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!pacbell.com!ucsd!ucbvax!duc220.uni-duisburg.de!hj412fr
From: hj412fr@duc220.uni-duisburg.de (Martin Anantharaman)
Newsgroups: comp.sys.apollo
Subject: Why do I need a "sfcb hash table mutex lock"?
Message-ID: <9012280914.AA03633@duc220.uni-duisburg.de>
Date: 28 Dec 90 09:14:33 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 42

We are having serious problems with a DN3550 under SR10.2 and the
service technicians from HP are stymied themselves, so I am hoping
for help from the GURUS out there:

	At the press of a key the system (display AND processes) suddenly
	freezes and crawls along at about 0.1 % of the usual speed (with luck I
	am able to shut the system, but that takes 20-30 minutes). Most of the time
	we have to reset the system, after which it runs normally for some time,
	BUT disk salvage everytime, lots of diskless stations hanging around ...
	
	We are unable to CRP from another node, though file service continues
	normally and I can get process lists with ps, pst etc.
	
	ps, pst from another node show some strangeness: the DM is shown
	without an owner and child processes (say from an aborted make) hang
	around after the parent is gone.
	
	Occasionally tcpd crashes during this period with an illegal reference
	in tcp_$ucblookup, causing rgyd and other daemons to spin.
	
	AND, (here comes...) at some stage the following message appears in the
	DM ouput pad: "unable to obtain sfcb hash table mutex lock from (stream
	manager/sfcb)" The same message also generally appears in the proc_dump for
	the vtserver.
	
	Nothing untoward appears in the netmain_srvr logs and DEX merely comes
	up with a strange error in the display system (we have a 40-plane DVS).
	The system_error_log has some disk-errors, but they are not recent.
	
Still, based on that, the service technicians exchanged the display
controller, but the same problem has occured again, though less
frequently. ALSO, DEX still repports the same error.

Any ideas, PLEASE?

Martin Anantharaman

FB7, FG7 (Mechanik)		Work:	+49 (203) 379-3336
Universitaet -GH- Duisburg	Home:	+49 (203) 37 65 89
Lotharstr. 1			FAX:	+49 (203) 379-3052
4100 Duisburg 1			E-Mail: hj412fr@duc220.uni-duisburg.de
West Germany