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Date:      Fri, 24 May 2002 22:39:16 +0800
From:      Eugene Grosbein <eugen@grosbein.pp.ru>
To:        stable@freebsd.org
Subject:   NFS problem with 4.6-PRERELEASE: SIGBUG in Apache
Message-ID:  <3CEE5094.EFF31B42@grosbein.pp.ru>

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Hi!

I have web server running Apache 1.3.23/FreeBSD.
It serves requests to small plain text files residing on NFS.
NFS server often updates files and web clients often download them.
All forked fine for years until I updated web server to 4.6-PRERELEASE.
Now web server sometimes fail to serve request due to SIGBUS in a child
trying to read file. Apache was not updated, NFS server was not touched.
NFS server is old FreeBSD 4.5-STABLE.

I've recompiled Apache with CFLAGS="-O0 -g" and got coredump.
One can have binary, coredump and untouched build directory
at http://www.grosbein.pp.ru/apache/
Binary and coredump are compressed to httpd.debug.tar.bz2
Apache seem to fail trying to read mmap'ed file from NFS.

Someone, please look at this.

Eugene Grosbein

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