** Description changed: I recently experienced a major slowdown (>10 sec) when logging on the NIS server at my work place. Our admin Paul Raines found that the issue was caused by a recent glibc update (2.11.1-0ubuntu7.8 posted on Feb 01, 2011), which appeared to break the "compat" mode for password settings in /etc/nsswitch.conf Observations: With the latest update of libc on Lucid and setting passwd/group/shadow as "compat", any remote authentication process will take over 10 seconds to respond. This include showing the login window by gdm/xdm, verifying password, and any gksu/sudo commands. To test the delay, I followed the comment #3 from Bug #335584 and ran sudo strace -vft -o /tmp/trace sudo true I noticed two 5-seconds time-out from the dumped log. Work-around: After changing passwd/group/shadow from "compat" to "files nis" in the /etc/nsswitch.conf file, the above mentioned long-delay went away. Here I attached the reply from Paul and my original test. We appreciate if anyone can double check with the mentioned update and see if there is a solution for this. + + My computer is running Lucid 10.04.2 LTS, with a kernel version + 2.6.32-27. =========================================================== Subject: Re: lost connection to home from kwafoo Date: Wed, 16 Feb 2011 09:52:38 -0500 (EST) From: Help Desk -- Paul Raines <help at nmr> To: Qianqian Fang <fangq at nmr> I changed /etc/nsswitch.conf so that instead of 'compat' for passwd, group shadow I have 'files nis'. This seems to have made the long NIS timeouts go away. This means that that '+/-' lines in /etc/passwd will not work though. I suggest you file a bug with Ubuntu saying 'compat' mode has broken in the lastest glibc release which appears to have updated Feb 1st. On Tue, 15 Feb 2011, Qianqian Fang wrote: > .... > although, the computer is still not completely normal. > When I select user name, type password in the xdm/gdm > window, or run any command with sudo, I get over 10 > seconds long delay between each action. > > I did some strace following this comment: > > https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/335584/comments/3 > > and the output for > > sudo strace -vft -o /tmp/trace sudo true > > is placed at /space/internal/3/users/fangq/Share/trace.sudo > > I can see there are two 5-second time-outs during this > command: one at line#28556 and one at #29149. In > either case, kwafoo tried to send some data through a socket to > 132.183.203.49, which I believe is a computer > named "sake", but it failed with time-out. > > I don't know what sake does in the nis configuration, > but somehow it does not communicate with kwafoo > properly. Strangely, the earlier communications > does work. This behavior is reproducible when running > the above command. > > Can anyone make heads and tails out of this log file? > > thanks > > Qianqian
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/720181 Title: glibc update breaks NIS compat mode on Lucid -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
