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15 <title>&os; &release; Errata </title>
17 <author><orgname>The &os; Project</orgname></author>
19 <pubdate>$FreeBSD$</pubdate>
24 <holder role="mailto:doc@FreeBSD.org">The &os; Documentation Project</holder>
27 <legalnotice xml:id="trademarks" role="trademarks">
35 <para>This document lists errata items for &os; &release;,
36 containing significant information discovered after the release
37 or too late in the release cycle to be otherwise included in the
38 release documentation.
39 This information includes security advisories, as well as news
40 relating to the software or documentation that could affect its
41 operation or usability. An up-to-date version of this document
42 should always be consulted before installing this version of
45 <para>This errata document for &os; &release;
46 will be maintained until the release of &os; &release.next;.</para>
50 <sect1 xml:id="intro">
51 <title>Introduction</title>
53 <para>This errata document contains <quote>late-breaking news</quote>
55 Before installing this version, it is important to consult this
56 document to learn about any post-release discoveries or problems
57 that may already have been found and fixed.</para>
59 <para>Any version of this errata document actually distributed
60 with the release (for example, on a CDROM distribution) will be
61 out of date by definition, but other copies are kept updated on
62 the Internet and should be consulted as the <quote>current
63 errata</quote> for this release. These other copies of the
65 <link xlink:href="https://www.FreeBSD.org/releases/" />,
67 which keep up-to-date mirrors of this location.</para>
69 <para>Source and binary snapshots of &os; &release.branch; also
70 contain up-to-date copies of this document (as of the time of
73 <para>For a list of all &os; CERT security advisories, see
74 <link xlink:href="https://www.FreeBSD.org/security/"/>.</para>
77 <sect1 xml:id="security">
78 <title>Security Advisories</title>
83 <sect1 xml:id="errata">
84 <title>Errata Notices</title>
89 <sect1 xml:id="open-issues">
90 <title>Open Issues</title>
94 <para>An issue was discovered with Amazon® EC2™
95 images which would cause the virtual machine to hang during
96 boot when upgrading from previous FreeBSD versions. New
97 EC2™ installations are not affected, but exisiting
98 installations running earlier releases are advised to wait
99 until the issue is resolved in an Errata Notice before
100 upgrading. An Errata Notice to address this is planned
101 following the release.</para>
105 <para>&os;/&arch.i386; installed on ZFS may crash during boot
106 when the ZFS pool mount is attempted while booting an
107 unmodified <literal>GENERIC</literal> kernel.</para>
109 <para>A system tunable has been added as of revision
110 <literal>r286584</literal> to make the
111 <literal>kern.kstack_pages</literal> tunable configurable
112 without recompiling the kernel.</para>
114 <para>To mitigate system crashes with such configurations,
115 chose <literal>Escape to loader prompt</literal> in the boot
116 menu and enter the following lines from &man.loader.8;
117 prompt, after an <literal>OK</literal>:</para>
119 <screen>set kern.kstack_pages=4
122 <para>Add this line to
123 <filename>/boot/loader.conf</filename> for the change to
124 persist across reboots:</para>
126 <programlisting>kern.kstack_pages=4</programlisting>
130 <para>A bug was diagnosed in interaction of the
131 <literal>pmap_activate()</literal> function and
132 <acronym>TLB</acronym> shootdown <acronym>IPI</acronym>
133 handler on amd64 systems which have <acronym>PCID</acronym>
134 features but do not implement the <acronym>INVPCID</acronym>
135 instruction. On such machines, such as SandyBridge™
136 and IvyBridge™ microarchitectures, set the loader
137 tunable <literal>vm.pmap.pcid_enabled=0</literal> during
140 <screen>set vm.pmap.pcid_enabled=0
143 <para>Add this line to
144 <filename>/boot/loader.conf</filename> for the change to
145 persist across reboots:</para>
147 <para>To check if the system is affected, check
148 &man.dmesg.8; for <acronym>PCID</acronym> listed in the
149 "Features2", and absence of
150 <acronym>INVPCID</acronym> in the "Structured Extended
151 Features". If the <acronym>PCID</acronym> feature is
152 not present, or <acronym>INVPCID</acronym> is present,
153 system is not affected.</para>
155 <programlisting>vm.pmap.pcid_enabled=0</programlisting>
159 <para>The Release Notes erroneously states the
160 <literal>WITH_SYSTEM_COMPILER</literal> &man.src.conf.5;
161 option is enabled by default, however this was disabled
162 prior to the final release build.</para>
166 <para>The release announcement stated "Wireless support
167 for 802.11n has been added." This was intended to
168 state "Wireless support for 802.11n has been added for
169 additional wireless network drivers."</para>
174 <sect1 xml:id="late-news">
175 <title>Late-Breaking News</title>
177 <para>No news.</para>