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bin/39272: login times out eroneosly

>Number:         39272
>Category:       bin
>Synopsis:       login times out eroneously after wrong password
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Aug 02 20:55:01 +0000 2008
>Originator:     Martin Husemann
>Release:        NetBSD 4.99.72
The NetBSD Foundation, Inc.
System: NetBSD 4.99.72 NetBSD 4.99.72 (TEQUILA) 
#15: Sat Aug 2 19:47:14 CEST 2008
Architecture: mipseb
Machine: sgimips

I accidently mistyped a password when trying to log in. The new "login:" prompt
appeared, and then imediately the login process died:

login: root
Password:         <-- enter wrong password here
Login incorrect or refused on this terminal.
login: ^D         <-- note correct behaviour here
NetBSD/sgimips ( (console)

login: root
Password:         <-- again enter wrong password
Login incorrect or refused on this terminal.
login: Login timed out after 300 seconds        <-- this happens within a few 
seconds (far less than 300)

try to login, enter wrong password - wait a few seconds (if it does not
happen, retry with new login process)

I have been able to reproduce this on various machines (m68k, sparc, mips, all
big endian and pretty slow) but never on i386 or amd64 (no idea if this is
speed related or big endian vs. little endian, or just plain luck).

I can not 100% reliably reproduce it, but very often. I have not been able
to make it happen with ktrace enabled for login.


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