From owner-freebsd-smp  Thu Nov 22  4:19:51 2001
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To: Alfred Perlstein <bright@mu.org>
Cc: freebsd-smp@freebsd.org
Subject: Re: nfsd/ypserv die on smp
In-reply-to: Your message of "Wed, 21 Nov 2001 12:50:31 CST."
             <20011121125031.I13393@elvis.mu.org>
Date: Thu, 22 Nov 2001 21:19:42 +0900
From: Yoriaki FUJIMORI <fujimori@prinz.fujimori.cache.waseda.ac.jp>
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There is no log message about this.
I tested several environmental changes such as
nfs_reserveved_port_only="YES" or "NO"
etc in rc.conf.  But, the situation does not change at all.

After rebooting this server running nfsd, I noticed a case in which
this happens.

Suppose S is an nfs server and C1, C2, .., Cn are nfs clients.
Assume nfsd servers are invoked on S on Nov 22, while nfsiod on
C1, .., Cn are invoked earlier, say on Nov 21.  Then, nfsd server
dies.  This can easily reproduced by invoking on C1, say,
find /hogehoge -name brahbrah -print
where /hogehoge is nfs mount from S.
From `lastcomm nfsd' on S, I know that nfsd dies with the invoke date
Nov 21 xx:yy, at this date nfsiod is invoked on C1.

So, nfsd dies when it is combined with clients' nfsiod which is older
than nfsd itself.
I do not know yet, if this is a default from the security reason.

However, as I said previously, this happens only on smp systems.
(No problem at all on uni processor systems here.)

Yoriaki Fujimori

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