[Bug 5306] New: busybox 1.19.4 telnetd won't allow logins.

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=5306

           Summary: busybox 1.19.4 telnetd won't allow logins.
           Product: Busybox
           Version: 1.19.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: kkuehl at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


This is an intermittent bug, but this is what syslog shows when the system gets
in this state:

Jun 13 15:35:02 sc143 telnetd[4381]: can't open '/dev/ttyp0': Input/output
error 
Jun 13 15:36:24 sc143 telnetd[4585]: can't open '/dev/ttyp0': Input/output
error 
Jun 13 15:36:40 sc143 telnetd[4631]: can't open '/dev/ttyp0': Input/output
error 

root at sc143:/etc/init.d# which telnetd
/usr/sbin/telnetd
root at sc143:/etc/init.d# ls -la /usr/sbin/telnetd 
lrwxrwxrwx 1 root root 17 2012-06-08 14:43 /usr/sbin/telnetd ->
../../bin/busybox

root at sc143:/etc/init.d# busybox 
BusyBox v1.19.4 (2012-03-01 11:02:04 CST) multi-call binary.
Copyright (C) 1998-2011 Erik Andersen, Rob Landley, Denys Vlasenko
and others. Licensed under GPLv2.
See source distribution for full notice.

Usage: busybox [function] [arguments]...
   or: busybox --list[-full]
   or: function [arguments]...

        BusyBox is a multi-call binary that combines many common Unix
        utilities into a single executable.  Most people will create a
        link to busybox for each function they wish to use and BusyBox
        will act like whatever it was invoked as.

Currently defined functions:
        adjtimex, clear, cmp, dos2unix, eject, free, iostat, mesg, mktemp,
        mpstat, nc, nmeter, nslookup, pipe_progress, reset, run-parts,
        setconsole, start-stop-daemon, stat, strings, telnetd, time,
        traceroute, unix2dos, uudecode, uuencode, which

This is how busybox is configured.
# grep -i telnetd config
CONFIG_TELNETD=y
CONFIG_FEATURE_TELNETD_STANDALONE=y
# CONFIG_FEATURE_TELNETD_INETD_WAIT is not set


telnetd is started from /etc/init.d like so:


 /usr/sbin/telnetd -l /bin/login

Any ideas what could be the root cause of this? Googling turns up lots noise
but  nothing that looks like this issue.

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