Date: Fri, 24 May 2002 14:37:15 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Eugene Grosbein <eugen@grosbein.pp.ru> Cc: stable@FreeBSD.ORG Subject: Re: NFS problem with 4.6-PRERELEASE: SIGBUG in Apache Message-ID: <200205242137.g4OLbFmi058923@apollo.backplane.com> References: <3CEE5094.EFF31B42@grosbein.pp.ru>
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If another NFS client or the NFS server rips the file out from
under Apache while Apache is trying to access the data via mmap(),
then Apache will most certainly seg-fault.
The file in question appears to be /mnt/main/netstat/index.html.
So the question is: Are you modifying, copying, overwriting, or
deleting this file on a different nfs client or on the server?
-Matt
Matthew Dillon
<dillon@backplane.com>
: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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