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- Path: sparky!uunet!pipex!warwick!uknet!gdt!aber!ccs
- From: ccs@aber.ac.uk (Christopher "Jd" Samuel)
- Newsgroups: comp.unix.ultrix
- Subject: Re: Upgrade from 4.3 to 4.2A
- Message-ID: <1992Nov16.145427.12428@aber.ac.uk>
- Date: 16 Nov 92 14:54:27 GMT
- References: <1992Nov3.150501.19957@monu6.cc.monash.edu.au> <2AF70531.20468@news.service.uci.edu> <1992Nov4.042108.1012@seas.smu.edu>
- Organization: University of Wales - Aberystwyth - Prifysgol Cymru
- Lines: 47
-
- In article <1992Nov4.042108.1012@seas.smu.edu>
- doug@seas.smu.edu (Doug Davis) doodled:
-
- > A good solid unix *SHOULD NOT* allow code executed in user mode to
- > crash the machine. This is a fairly simple concept that should
- > be fundumental in an OS design. Ultrix 4.2a is fairly solid
- > as far as unix's go (especially given ultrix's history) and there
- > is always growing pains. But there really is no good excuse for
- > some of the problems showing up in ultrix 4.3.
-
- /* Mea culpa if the errors below are not exactly what happened, */
- /* call it a memory fault if you like.. :-) */
-
- I'm not so sure about 4.2A, we had a user here pull both our main
- service machines (DEC Symetric Multi-Processor 5830's) over whilst
- playing about with mixed domain sockets (I think he connect()ed
- socket1->socket2, and then tried to connect() socket2->socket1). This
- caused both machines to fall over with a smp long lock, position mess-up
- error. Took our main systems person an entire evening going through
- crash dumps to find out what process had caused it.
-
- (The user ran it on one, saw that fall over, assumed it was a normal crash,
- and then proceded to pull the other over)
-
- DEC's response was along the lines of 'oh, it was a user program, thats
- your problem'... :-(
-
- We actually see quite a few smp lock long errors with locks timing out
- which pull the service machines over, and when we were trying to run
- DECs colourbook transport protocols (being a UK academic site) they fell
- over a lot more often..
-
- Our hope is that Ultrix 4.3 and DECNet phase V (and colourbook) will fix
- things.. /* pigs and wings and all that */
-
- > Oh well, we've been spending all our time fighting SUNOS (groan) bugs to
- > install 4.3 on much, but that should change soon.
-
- In my experience of our Sun 4/330 (used to run SunOS 4.1, now running
- SunOS 4.1.3) Suns seem a lot more reliable, although this may be because
- it doesn't have the load that our service machines do.
-
- Chris
- --
- Christopher Samuel, c/o Computer Unit, UCW Aberystwyth, Aberystwyth, WALES
- RFC: ccs@aber.ac.uk UUCP: *!mcsun!uknet!aber!ccs JNT: ccs@uk.ac.aber
- Deddf Iaith Newydd i Gymru | New Language Act for Wales
-