100% CPU usage and no login

[Luke Kenneth Casson Leighton]

> OK, I checked this out going really deep in the code, and I found the
> following:
> 
>    groupdb/groupunix.c:getgrpunixpwent() calls lib/util.c:gidtoname()
>       (through several steps) in a while cycle which goes by the
>       return value of getgrent().
>    lib/util.c:gidtoname() calls getgrgid() which resets the file
>       pointer of the group file (at least under my OS).
>    Therefore the while cycle in groupdb/groupunix.c:getgrpunixpwent()
>       would go into an infinite loop, if it did not have a break in it.

thanks.