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su logout gives 5 seconds 100% kernel time CPU load
From: |
Jason McManus |
Subject: |
su logout gives 5 seconds 100% kernel time CPU load |
Date: |
Fri, 15 Mar 2002 02:17:18 -0800 |
User-agent: |
Mutt/1.2.5i |
Hi there,
I'm posting regarding a strange issue related to su (GNU sh-utils) 2.0.11.
When running su and switching to another user (root or any other account),
upon logging out, it gives me about a 5 second delay, utilizing 100% kernel
time CPU load, before returning to the prior shell. I have attempted to run
strace on it and direct the output to a file, but it refuses to accept my
password when doing so (likely a security precaution), so I'm unsure what
is causing the delay. It also only seems to do this when running under
X (Eterm, aterm, and xterm all exhibit the same behaviour), as when I
switch to a console or login over the network (or even localhost) this
does not occur.
I am running a heavily upgraded RedHat 7.1 machine on a Sony VAIO z505-ls
notebook. The only possible related change I have made since this behaviour
started appearing was a somewhat major change, upgrading the kernel to
2.4.19-pre3-ac1. Upon restart, this issue began appearing.
su is configured to run via PAM, with the contents of /etc/pam.d/su being:
------------------------
#%PAM-1.0
auth sufficient /lib/security/pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel"
group.
#auth sufficient /lib/security/pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth required /lib/security/pam_wheel.so use_uid
auth required /lib/security/pam_stack.so service=system-auth
account required /lib/security/pam_stack.so service=system-auth
password required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth
session optional /lib/security/pam_xauth.so
Any help would be greatly appreciated. While only a somewhat minor
annoyance, I have been unable to come up with a solution, nor has anyone I
have consulted about the issue.
Thanks very much,
Jason McManus
<address@hidden>
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