[FreeBSD-Announce] FreeBSD 5.3-RELEASE Errata Notice: FreeBSD-EN-05:03.ipi

From: Ken Smith (kensmith_at_FreeBSD.org)
Date: 01/17/05

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    Date: Sun, 16 Jan 2005 21:59:51 -0500
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    FreeBSD-EN-05:03.ipi Errata Notice
                                                              The FreeBSD Project

    Topic: FreeBSD/i386 may panic under heavy load on SMP machines

    Category: core
    Module: smp
    Announced: 2005-01-16
    Credits: Stephan Uphoff, Xin LI
    Affects: FreeBSD 5.3-RELEASE
    Corrected: 2005-01-16 08:29:14 UTC

    I. Background

    Inter-processor Interrupt, also known as ``IPI'', is a mechanism on
    multiprocessor system (specifically, SMP) to indicate some event that the
    other CPUs should be aware of.

    II. Problem Description

    Under FreeBSD 5.3-RELEASE prior to the correction date, when there are
    more than two pending IPI vectors per local APIC it is possible to cause
    deadlocks. The deadlock will then result in a kernel panic.

    III. Impact

    SMP servers that encounted heavy load, e.g. buildworld with md(4) and -jN,
    can easily be crashed.

    IV. Solution

    Do one of the following to update the source tree:

      1) Upgrade your affected system to the RELENG_5_3 errata branch dated
         after the correction date using cvsup(1) or cvs(1). This is the
         preferred method. For information on how to use cvsup(1) to update
         your source code see:
           http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/cvsup.html

      2) Obtain the updated files using the cvsweb interface. Cvsweb is a
         Web interface to the CVS repository. The URL to the general
         interface is "http://www.freebsd.org/cgi/cvsweb.cgi/". You can
         obtain any of the source files for the RELENG_5_3 branch by going
         to the src directory ("http://www.freebsd.org/cgi/cvsweb.cgi/src")
         and then selecting the "RELENG_5_3" branch tag. With the branch
         tag set navigate to the files listed below in the "Correction
         details" section and download them, making sure you get the correct
         revision numbers. Copy the downloaded files into your /usr/src tree.

    If using the second procedure you should make sure you have used that
    same procedure to download all previous Errata Notices and Security
    Advisories. We strongly discourage this procedure due to the problems
    that may be caused by not doing that - using the first procedure takes
    care of making sure all updates get applied.

    Then follow the normal procedures for rebuilding/reinstalling the kernel.
    Details about rebuilding/reinstalling are available here:

      http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html

    V. Correction details

    The following list contains the revision numbers of each file that was
    corrected in FreeBSD.

    - ---------------------------------------------------------------------------
    RELENG_5_3

      Revision Changes Path
      1.342.2.13.2.8 +4 -0 src/UPDATING
      1.62.2.15.2.10 +1 -1 src/sys/conf/newvers.sh
      1.101.4.1 +2 -50 src/sys/i386/i386/apic_vector.s
      1.235.2.3.2.1 +65 -37 src/sys/i386/i386/mp_machdep.c
      1.8.4.1 +42 -9 src/sys/i386/include/apicvar.h
      1.78.4.1 +2 -5 src/sys/i386/include/smp.h

    - ---------------------------------------------------------------------------

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