Apologies if this has been discussed; it seems to affect a lot of my
systems so I'm surprised if it hasn't, but I haven't found an effective
solution looking through the list.
Various PowerEdge 1950s/2950s without DRAC exhibit this symptom running
RHEL 5. There is a multiline warning banner in /etc/issue. Console
redirection is enabled, and the following form of kernel line is used in
/boot/grub/menu.lst:
timeout=5
serial --unit=1 --speed=57600
terminal --timeout=5 serial console
title Red Hat Enterprise Linux Server (2.6.18-164.2.1.el5)
root (hd0,1)
kernel /boot/vmlinuz-2.6.18-164.2.1.el5 ro root=LABEL=/
console=tty0 console=ttyS1,57600 rhgb
initrd /boot/initrd-2.6.18-164.2.1.el5.img
The following is in /etc/inittab:
co:2345:respawn:/sbin/agetty -h ttyS1 57600 vt100-nav
(The agetty -h option doesn't seem to matter.)
Boot is fine; I have access to the console over IPMI/SOL during boot,
all the way to getting an agetty login banner and prompt. But once I
disconnect my IPMI/SOL session, after some delay, the BMC enters a kind
of feedback loop where the banner text is fed back into agetty. agetty
then logs a lot of failed login attempts, and eventually init pauses
spawning agetty for 5 minutes because of excessive restarts. This looks
like this in /var/log/secure (over and over again):
Oct 23 21:03:15 foo login: FAILED LOGIN 1 FROM (null) FOR
warning**warning**warning**warning**warning**warning**warning, User not
known to the underlying authentication module
Oct 23 21:03:17 foo login: pam_unix(login:auth): bad username []
Oct 23 21:03:17 foo login: pam_succeed_if(login:auth): error retrieving
information about user
Oct 23 21:03:17 foo login: FAILED LOGIN 2 FROM (null) FOR , User not
known to the underlying authentication module
Oct 23 21:03:18 foo login: pam_unix(login:auth): bad username []
Oct 23 21:03:18 foo login: pam_succeed_if(login:auth): error retrieving
information about user
Oct 23 21:03:18 foo login: FAILED LOGIN 3 FROM (null) FOR , User not
known to the underlying authentication module
Oct 23 21:03:20 foo login: pam_unix(login:auth): bad username []
Oct 23 21:03:20 foo login: pam_succeed_if(login:auth): error retrieving
information about user
Oct 23 21:03:20 foo login: FAILED LOGIN SESSION FROM (null) FOR , User
not known to the underlying authentication module
And in /var/log/messages:
Oct 23 21:03:20 hobo init: Id "co" respawning too fast: disabled for 5
minutes
If I reconnect to the SOL console using IPMI, everything's fine
(assuming init hasn't disabled agetty at the time I connect). Once I
disconnect, the same thing starts again (again after some delay).
I haven't found any options to agetty that alter this behavior, and the
BIOS "Redirection after boot" option doesn't alter it either. It's a
problem because init makes agetty unavailable for 5 minutes at a time,
and it also causes lots of noise in /var/log/secure.
Does anyone know what I'm missing? I would appreciate any help on this.
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