Disappearing AdvFS/NFS directory in Digital Unix 4.0

From: J. Dean Brock <brock_at_cs.unca.edu>
Date: Thu, 12 Sep 1996 17:44:54 -0400

Anyone seen any directories vanish in Digital Unix 4.0?

I was doing a compile over the network and all of the
sudden I started getting indications that the directory
I was working in had disappeared. My first theory was
that someone on the server had deleted it, but....

I logged back into the server and typed
    woodfin% ls -ld textutils-1.19
    drwxrwxr-x 8 brock hacks 8192 Sep 12 17:02 textutils-1.19
and there was my directory. However, when I tried to list its contents
(including . and ..) I got
    woodfin% ls -la textutils-1.19
    total 8
    drwxrwxr-x 8 brock hacks 8192 Sep 12 17:02
which seemed rather odd as I should at least get . and ..

I then did a couple of od's and got
    woodfin% od -x textutils-1.19
    0000000 baff 0019 1400 0100 2e00 0000 ba00 0019
    0000020 1500 0080 0200 0000 1400 0200 2e00 002e
    0000040 0200 0000 0100 0080 c200 0019 1c00 0b00
    ....
and
    woodfin% od -x textutils-1.19
    0000000 0019baff 01001400 00002e00 0019ba00
    0000020 00801500 00000200 02001400 002e2e00
    0000040 00000200 00800100 0019c200 0b001c00

Hmmmm... That 19baff looks a tad out of place.

Now the inode number of the directory is 6586
    woodfin% ls -i /src/textutils-1.19
     6586
and 6586 is 19ba in base 16. A showxfile results in
    woodfin% showfile -x textutils-1.19

             Id Vol PgSz Pages XtntType Segs SegSz Log Perf File
      19ba.8015 1 16 1 simple ** ** ftx 100% textutils-1.19

So how did that extra 'ff' get stuck at the end of the 19ba?

I also did a uerf to look for hardware problems and didn't see
anything there. Anyone got any ideas for recovering this?
Received on Fri Sep 13 1996 - 00:21:42 NZST

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