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From: todd@uhccux.UUCP (The Perplexed Wiz)
Newsgroups: comp.unix.wizards
Subject: Re: wtmp problem: garbage in /usr/adm/wtmp
Message-ID: <470@uhccux.UUCP>
Date: Tue, 5-May-87 17:08:57 EDT
Article-I.D.: uhccux.470
Posted: Tue May  5 17:08:57 1987
Date-Received: Thu, 7-May-87 06:39:01 EDT
References: <469@uhccux.UUCP> <6554@mimsy.UUCP>
Reply-To: todd@uhccux.UUCP (The Perplexed Wiz)
Organization: U. of Hawaii, Manoa (Honolulu)
Lines: 45

In article <6554@mimsy.UUCP> chris@mimsy.UUCP (Chris Torek) writes:
>In article <469@uhccux.UUCP> todd@uhccux.UUCP (The Perplexed Wiz) writes:
>>... my wtmp file was getting data ok and then it looks like some
>>garbage got thrown into it causing an extra field to be inserted
>This occurs when the file system fills up.  `struct utmp' is 36
>bytes long in stock 4.3BSD.  It was 20 bytes long in 4.1BSD, and

Hmm....That sounds right but my file systems are ok in terms of
space availability.  See below:

Filesystem    total    kbytes  kbytes  percent
   node       kbytes    used    free   used    Mounted on
/dev/ra0a       7423    5259    1421    79%    /
/dev/ra0g     195535   79183   96798    45%    /usr	<==/usr/adm/wtmp here
/dev/ra0h     205471   65181  119742    35%    /usr/users
/dev/ra1a       7423       1    6679     0%    /tmp1
/dev/ra1g     117207   70841   34645    67%    /usr/local
/dev/ra1h     283531   48580  206597    19%    /usr/spool
/dev/ra2a       7423       3    6677     0%    /tmp2
/dev/ra2d       7423       9    6671     0%    /T1
/dev/ra2e      26611     224   23726     1%    /tmp
/dev/ra2f     228015   53505  151708    26%    /T2
/dev/ra2g      38879   15978   19013    46%    /T3
/dev/ra3a       7423       9    6671     0%    /tmp3
/dev/ra3g     195535   76487   99494    43%    /uh3g
/dev/ra3h     205471   13334  171589     7%    /uh3h
/dev/ra4a       7423       9    6671     0%    /tmp4
/dev/ra4g     195535   13749  162232     8%    /uh4g
/dev/ra4h     205471    6563  178360     4%    /uh4h
/dev/ra5a       7423       9    6671     0%    /tmp5
/dev/ra5g     195535     346  175635     0%    /uh5g
/dev/ra5h     205471   65692  119231    36%    /uh5h

Very puzzling problem.  A couple of months back I heard that wtmp could
become corrupted if two users logged in at exactly the same time.
Does anyone know for sure if that is true?

BTW: I forgot to mention in my first posting that I only have
a binary license (big sigh)....todd

-- 
Todd Ogasawara, U. of Hawaii Computing Center
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