From: Michael S. Peek (peek@apis.tiem.utk.edu)
Date: Thu Aug 08 2002 - 11:41:01 EDT
Hello all,
I have just upgraded ssh on my Solaris 8 system and everyting works
wonderfully except on three systems. On these three systems ssh hangs for 37
seconds when trying to ssh from one of these three systems to anywhere else.
I believe I have tracked this problem down, but I don't understand the cause.
Using truss (with a rather extreme set of options: -f -a -e -l -d -tall -vall
-xall -sall -mall -rall -wall -uall) I see the following:
18785/1: 1.4638 open64(0xFF226358, 0) = 6
18785/1: 0xFF226358: "/etc/.name_service_door"
...
18750/1: 1.5779 close(6) = 0
18785/1: door(6, 0xFFBED430) (sleeping...)
18750/1: waitid(0, 18785, 0xFFBED748, 03) (sleeping...)
18785/1: 38.0478 door(6, 0xFFBED430) = 0
18785/1: 38.0481 door(6, 0xFFBED4C8) = 0
If I am reading this right, the timstamps show that between the close(6)
(timestamp 1.5779) and the second door(6, 0xFFBED430) (timestamp 38.0478),
there's a 37 second delay. According to the manual page for truss, the
timstamps signify the completion of the command, which means, if I am correct,
that the cause is that second door(6, 0xFFBED430) on /etc/.name_service_door.
This only happens on these three hosts. So my question is:
(1) is my diagnosis correct in thinking that the problem is with
/etc/.name_service_door?
and
(2) what uses /etc/.name_service_door?
(This is confusing my (l)users into thinking that there's something wrong with
their account, and they're griping to me about it.) I'd like to restart
whatever service is causing the slowdown, but I don't know what it is, and
there is no mention of .name_service_door in any of the Answerbook2 libraries
or man pages. (I thought I would be slick and look at the inode of
/etc/.name_service_door and then look for that inode in /proc/*/fd/*, but
there are an awful lot of programs that have something open to that door!)
Any ideas anyone? Should I just "punt" and reboot them?
Thanks for your input,
Michael Peek
Michael Peek peek@tiem.utk.edu
------------------------------------------------------------------------------
Systems Administrator / C++ Database Programmer 569 Dabney Hall
Department of Ecology and Evolutionary Biology Knoxville, TN 37996-1610
University of Tennessee at Knoxville
------------------------------------------------------------------------------
(865)974-0224 phone, (865)974-3067 fax http://www.tiem.utk.edu/~peek
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