strange stuff from 'last'

["Sheldon E. Newhouse" <sen1 math msu edu>]

Hi,
 Since upgrading from RH-4.2 to RH-5.1, I have regularly noticed the
following strange stuff appearing from last.

ing      *4***        ************J\*@ Thu Aug  6 12:46   still logged in
\h* ***  otify        ***@             Thu Aug  6 12:46   still logged in
\h* **** otify        ***@             Thu Aug  6 12:46 - 12:46  (00:00)

However notice that 'who' does not report this 

lamm     tty1     Aug  6 12:46
lamm     ttyp2    Aug  6 12:47 (:0.0)
lamm     ttyp4    Aug  6 15:05 (:0.0)
lamm     ttyp5    Aug  6 14:21 (:0.0)
lamm     ttyp9    Aug  6 23:06 (:0.0)
  
Reboots stop the problem for awhile but then it reappears. 

I also read that glibc has sometimes produced corruption in utmp.  Do
others notice this strange output of 'last?' Is this a security issue or
more likely just growing pains for utmp and glibc? 

Thanks for input,
 -sen