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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-17:01.pcie

    From FreeBSD Errata Notices@21:1/5 to All on Thu Feb 23 08:00:00 2017
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    ============================================================================= FreeBSD-EN-17:01.pcie Errata Notice
    The FreeBSD Project

    Topic: System hang when booting when PCI-express HotPlug is enabled

    Category: core
    Module: kernel
    Announced: 2017-02-23
    Credits: Alan Somers, Dave Baukus
    Affects: FreeBSD 11.0
    Corrected: 2017-02-07 22:40:38 UTC (stable/11, 11.0-STABLE)
    2017-02-23 07:11:48 UTC (releng/11.0, 11.0-RELEASE-p8)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    Native PCI-express HotPlug permits PCI-express devices to be added and
    removed at runtime in slots that support HotPlug.

    II. Problem Description

    Some PCI-express slots indicate partial support for PCI-express HotPlug
    in the capability registers associated with an individual slot. The PCI-express HotPlug driver attempted to configure these slots for HotPlug operation. However, since these slots do not fully support HotPlug,
    enabling HotPlug results in unpredictable behavior.

    III. Impact

    On at least some systems, booting a kernel with PCI-express HotPlug
    support can hang.

    IV. Workaround

    The hw.pci.enable_pcie_hp loader tunable can be set to 0 to disable
    support for PCI-express HotPlug before booting an affected kernel.

    V. Solution

    Perform one of the following:

    1) Upgrade your system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date.

    Afterward, reboot the system.

    2) To update your system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the i386 or amd64
    platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install

    Afterward, reboot the system.

    3) To update your system via a source code patch:

    The following patches have been verified to apply to the applicable
    FreeBSD release branches.

    a) Download the relevant patch from the location below, and verify the
    detached PGP signature using your PGP utility.

    # fetch https://security.FreeBSD.org/patches/EN-17:01/pcie.patch
    # fetch https://security.FreeBSD.org/patches/EN-17:01/pcie.patch.asc
    # gpg --verify pcie.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
    system.

    VI. Correction details

    The following list contains the correction revision numbers for each
    affected branch.

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/11/ r313408 releng/11.0/ r314125
    - -------------------------------------------------------------------------

    To see which files were modified by a particular revision, run the
    following command, replacing NNNNNN with the revision number, on a
    machine with Subversion installed:

    # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

    Or visit the following URL, replacing NNNNNN with the revision number:

    <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

    VII. References

    <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211699>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-17:01.pcie.asc> -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v2.1.18 (FreeBSD)

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