4 Feb
2019
4 Feb
'19
11:24 a.m.
From: Jay Jaeger
This sort of situation, where DEC diagnostics run OK
but UNIX has issues
was reported to be not all that uncommon - to the point where the urban
legend was that some DEC FE's would fire up Unix V6 as a sort of system
exerciser.
Amusing! Never heard that; our -11's were never under maintenance, so DEC FE's
never worked on them.
Make a copy of ls, and see if the copy also fails
It acts just like the original; fails when run by itself, runs OK when 'sleep'
is also running (in the background).
From: Bob Smith
We finally had the cpu backplane replaced
Ow. Not an option for Fritz, I expect. (I dunno - anyone have a spare /45
backplane?)
From: Paul Koning
Is there any way to attach a logic analyzer to various
data paths on
this machine?
I had suggested to Fritz that the symptoms led me to believe that it was time
to deploy a LA, especially since the MM trap only occurs once between him
typing 'ls' and the process failing - i.e. easy to trigger on.
He offered me the options of look at the IR or at the UNIBUS - I opted for
the IR so we can see _exactly_ what the machine _thinks_ it is doing! No
report back yet, though.
Noel
4 Feb
4 Feb
12:17 p.m.
Noel, it might be a wonky filesystem.
I?ve had ls -l seg fault because of bad attribute data on a file in a directory on
Solaris.
Interestingly, ls (without the -l) worked okay.
Maybe fsck or the equivalent command may show something.
It was a Solaris system with many concurrent users so I couldn?t take it down to run
fsck so I
ended up writing a quick Perl program to just list file names and then modified it to get
the attributes. It seg faulted when it came to the bad file name. I used Perl unlink to
kill it and everything was okay.
The corruption probably came because the entire disk was going bad.
Just a thought.
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Noel Chiappa via cctalk
<cctalk at classiccmp.org>
Sent: Monday, February 4, 2019 11:24:19 AM
To: cctalk at classiccmp.org
Cc: jnc at mercury.lcs.mit.edu
Subject: Re: PDP-11/45 RSTS/E boot problem
From: Jay Jaeger
This sort of situation, where DEC diagnostics run OK
but UNIX has issues
was reported to be not all that uncommon - to the point where the urban
legend was that some DEC FE's would fire up Unix V6 as a sort of system
exerciser.
Amusing! Never heard that; our -11's were never under maintenance, so DEC FE's
never worked on them.
Make a copy of ls, and see if the copy also fails
It acts just like the original; fails when run by itself, runs OK when 'sleep'
is also running (in the background).
From: Bob Smith
We finally had the cpu backplane replaced
Ow. Not an option for Fritz, I expect. (I dunno - anyone have a spare /45
backplane?)
From: Paul Koning
Is there any way to attach a logic analyzer to various
data paths on
this machine?
I had suggested to Fritz that the symptoms led me to believe that it was time
to deploy a LA, especially since the MM trap only occurs once between him
typing 'ls' and the process failing - i.e. easy to trigger on.
He offered me the options of look at the IR or at the UNIBUS - I opted for
the IR so we can see _exactly_ what the machine _thinks_ it is doing! No
report back yet, though.
Noel
2149
days inactive
2149
days old
1 comments
2 participants
participants (2)
-
jnc＠mercury.lcs.mit.edu -
wayne.sudol＠hotmail.com