Date: Wed, 13 May 2015 23:12:01 GMT From: FreeBSD Errata Notices <errata-notices@freebsd.org> To: FreeBSD Errata Notices <errata-notices@freebsd.org> Subject: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-15:05.ufs Message-ID: <201505132312.t4DNC1wd035400@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-EN-15:05.ufs Errata Notice The FreeBSD Project Topic: Deadlock on reboot with UFS tuned with SU+J Category: core Module: ufs Announced: 2015-05-13 Credits: Konstantin Belousov Affects: FreeBSD 10.1 Corrected: 2015-04-10 02:23:44 UTC (stable/10, 10.1-STABLE) 2015-05-13 22:52:35 UTC (releng/10.1, 10.1-RELEASE-p10) 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 The Unix File System (UFS) is one of several filesystems available on FreeBSD. UFS supports several optimization features, such as soft updates and journaling, both of which keep track of filesystem metadata to ensure a consistent state in the event of a crash or power failure. II. Problem Description When the root filesystem is configured with soft updates and journaling both enabled, which is the default for FreeBSD 10.1-RELEASE installations, the system may deadlock after a source-based or binary upgrade when the init(8) binary is replaced. The deadlock occurs when issuing reboot(8) or shutdown(8), after which the system becomes unresponsive when syncing the filesystem. III. Impact When the deadlock occurs, a hard system reset or power cycle may be required. IV. Workaround Systems that do not have soft updates and journaling enabled on a UFS root filesystem are unaffected. It is possible to work around the issue by waiting before issuing reboot(8) or shutdown(8) after upgrading the userland. It has been observed that deferring the reboot(8) for a period of 60 seconds to be sufficient. It is encouraged to issue several sync(8) commands during this period, to help ensure the filesystem writes have completed. Additionally, disabling soft update journaling on the root filesystem can also work around the issue. 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. 2) To update your present 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 3) To update your present 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-15:05/ufs.patch # fetch https://security.FreeBSD.org/patches/EN-15:05/ufs.patch.asc # gpg --verify ufs.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/10/ r281350 releng/10.1/ r282873 - ------------------------------------------------------------------------- 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/195458> The latest revision of this Errata Notice is available at https://security.FreeBSD.org/advisories/FreeBSD-EN-15:05.ufs.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.2 (FreeBSD) iQIcBAEBCgAGBQJVU9dbAAoJEO1n7NZdz2rn3JYP/2HeyHsGEAwl+1NCVLu/Eimj wl/jK7Pl2SMWCEAkynkP8Cs5ibCbtzA4SV1RP8OPCF42yQJmk/kzR0Rmuq+LboFC QGmus/0Q/JCXqabDEzNx7/tHibeJInveGDf4a4/rg38Q+zO7MYZFmGsWoFEC2RKn lEWb/kh5AxMagaj5lns4WHmo0TFlyOUFaJijGxXhHu3IFZwuZB60a5cXJ8OjBulk FO7uIcZ7OTP43y4VvvBsFV6bxeFyoMNF8tgB+dsBzatNQhl7yAxWMMEiDUNBEaqV mfjKZxHRkB+GGjQwv2Cq4463kNQvwknN9vms536fS7HuecFMITbyD37ySR3pSRoi KVGopfpDr0NWjn1/N7UyAsY+6CAYqpsilYvq2slBu2J/Aj6jCyDhPUTnjHKz1m91 rdyBjkHod9XkLYqwCkJlWjIxnLxCDlv8vwUjOe2/TjCUFO6FIO6lgvCVkgekIlwG rPxx+bqfKSarQQSL6a4MWFFYwt79c292A3nodS0sLIL4YRNwQnFvuYVB/qxIWD1x ecKJmbL0bm3S1T/qWa89Xh55NWFKs0bxVmjQCWu84re/20+oWcaXFg8Oeqnq+xFV ke4EzbxhoU4KWzvsFbc+U+EZhTVLVlnjbAW073Z6QyykfBs2RhudUGB51T/3XB3I jAU8LNkMBjZhe7khLFLD =BTx0 -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201505132312.t4DNC1wd035400>