Attachment 214169 Details for Bug 239240 – Inprogress Errata Notice

Inprogress Errata Notice

errata-template-239240.txt (text/plain), 3.74 KB, created by Eric Joyner on 2020-05-05 18:11:51 UTC

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Creator: Eric Joyner

Created: 2020-05-05 18:11:51 UTC

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>=============================================================================
>FreeBSD-EN-ERRATA_TEMPLATE                                      Errata Notice
>                                                          The FreeBSD Project
>
>Topic:          Prevent iflib watchdog from resetting idle queues
>
>Category:       core
>Module:         iflib
>Announced:      2020-05-05
>Credits:        
>Affects:        FreeBSD 12.0, FreeBSD 12.1
>Corrected:      2020-01-10 18:29:XX UTC (stable/12, 12.1-STABLE)
>                2020-XX-XX XX:XX:XX UTC (releng/12.1, 12.1-RELEASE-pXX)
>
>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
>
>iflib is a framework that contains common code for network drivers to use,
>reducing code duplication. One function it contains is a "watchdog" that
>periodically checks the driver's software Tx queues to see if they're hung.
>
>II.  Problem Description
>
>The watchdog in (I) would sometimes trigger a false positive queue hang
>just after a link state change.
>
>III. Impact
>
>The iflib framework would print messages for the affected devices such as
>
>"igb0: TX(2) desc avail = 1024, pidx = 0"
>
>and would stop allowing Tx traffic to be sent.
>
>IV.  Workaround
>
>One reported workaround is to restart the operating system when this occurs.
>
>V.   Solution
>
>Upgrade your system to a supported FreeBSD stable or release / security
>branch (releng) dated after the correction date.
>[XX Needs reboot? Mention please]
>
>Perform one of the following:
>
>1) 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
>[XX Needs reboot? Mention please]
>
>2) 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.
>
>[FreeBSD 11.3]
># fetch https://security.FreeBSD.org/patches/EN-XX:XX/XXXX.patch
># fetch https://security.FreeBSD.org/patches/EN-XX:XX/XXXX.patch.asc
># gpg --verify XXXX.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/12/                                                        r356605
>releng/12.1/                                                      rXXXXXX
>-------------------------------------------------------------------------
>
>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
>
>This problem was originally seen on a device using the em(4) driver, and
>there was a report that it occured on ixgbe(4), too. Both of those drivers
>are Intel drivers that use the iflib(4) framework.
>
><URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239240>
>
>The latest revision of this advisory is available at
><URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-XX:XX.XXXXX.asc>

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