138 lines
5 KiB
Text
138 lines
5 KiB
Text
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-15:05.ufs Errata Notice
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The FreeBSD Project
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Topic: Deadlock on reboot with UFS tuned with SU+J
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Category: core
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Module: ufs
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Announced: 2015-05-13
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Credits: Konstantin Belousov
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Affects: FreeBSD 10.1
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Corrected: 2015-04-10 02:23:44 UTC (stable/10, 10.1-STABLE)
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2015-05-13 22:52:35 UTC (releng/10.1, 10.1-RELEASE-p10)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:https://security.freebsd.org/>.
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I. Background
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The Unix File System (UFS) is one of several filesystems available on
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FreeBSD. UFS supports several optimization features, such as soft updates
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and journaling, both of which keep track of filesystem metadata to ensure
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a consistent state in the event of a crash or power failure.
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II. Problem Description
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When the root filesystem is configured with soft updates and journaling
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both enabled, which is the default for FreeBSD 10.1-RELEASE installations,
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the system may deadlock after a source-based or binary upgrade when the
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init(8) binary is replaced. The deadlock occurs when issuing reboot(8)
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or shutdown(8), after which the system becomes unresponsive when syncing
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the filesystem.
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III. Impact
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When the deadlock occurs, a hard system reset or power cycle may be
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required.
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IV. Workaround
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Systems that do not have soft updates and journaling enabled on a UFS root
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filesystem are unaffected.
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It is possible to work around the issue by waiting before issuing reboot(8)
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or shutdown(8) after upgrading the userland. It has been observed that
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deferring the reboot(8) for a period of 60 seconds to be sufficient. It is
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encouraged to issue several sync(8) commands during this period, to help
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ensure the filesystem writes have completed.
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Additionally, disabling soft update journaling on the root filesystem can
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also work around the issue.
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V. Solution
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Perform one of the following:
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1) Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date.
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2) To update your present system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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3) To update your present system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch https://security.FreeBSD.org/patches/EN-15:05/ufs.patch
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# fetch https://security.FreeBSD.org/patches/EN-15:05/ufs.patch.asc
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# gpg --verify ufs.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/10/ r281350
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releng/10.1/ r282873
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://bugs.freebsd.org/195458>
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The latest revision of this Errata Notice is available at
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https://security.FreeBSD.org/advisories/FreeBSD-EN-15:05.ufs.asc
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