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15 <title>&os; &release.prev; Errata </title>
17 <author><orgname>The &os; Project</orgname></author>
19 <pubdate>$FreeBSD$</pubdate>
24 <holder role="mailto:doc@FreeBSD.org">The &os; Documentation
28 <legalnotice xml:id="trademarks" role="trademarks">
36 <para>This document lists errata items for &os; &release.prev;,
37 containing significant information discovered after the
38 release or too late in the release cycle to be otherwise
39 included in the release documentation. This information
40 includes security advisories, as well as news relating to the
41 software or documentation that could affect its operation or
42 usability. An up-to-date version of this document should
43 always be consulted before installing this version of
46 <para>This errata document for &os; &release.prev; will be
47 maintained until the release of &os; &release.next;.</para>
51 <sect1 xml:id="intro">
52 <title>Introduction</title>
54 <para>This errata document contains <quote>late-breaking
55 news</quote> about &os; &release.prev; Before installing this
56 version, it is important to consult this document to learn about
57 any post-release discoveries or problems that may already have
58 been found and fixed.</para>
60 <para>Any version of this errata document actually distributed
61 with the release (for example, on a CDROM distribution) will be
62 out of date by definition, but other copies are kept updated on
63 the Internet and should be consulted as the <quote>current
64 errata</quote> for this release. These other copies of the
65 errata are located at <link
66 xlink:href="http://www.FreeBSD.org/releases/" />, plus any
67 sites 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 <link
74 xlink:href="http://www.FreeBSD.org/security/"/> or <link
75 xlink:href="ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/"/>.</para>
78 <sect1 xml:id="security">
79 <title>Security Advisories</title>
84 <sect1 xml:id="errata">
85 <title>Errata Notices</title>
90 <sect1 xml:id="open-issues">
91 <title>Open Issues</title>
95 <para>&os;/&arch.i386; &release.prev; running as a guest
96 operating system on <application>VirtualBox</application>
97 can have a problem with disk I/O access. It depends on some
98 specific hardware configuration and does not depend on a
99 specific version of <application>VirtualBox</application> or
100 host operating system.</para>
102 <para>It causes various errors and makes &os; quite unstable.
103 Although the cause is still unclear, disabling unmapped I/O
104 works as a workaround. To disable it, choose
105 <literal>Escape to loader prompt</literal> in the boot menu
106 and enter the following lines from &man.loader.8; prompt,
107 after an <literal>OK</literal>:</para>
109 <screen>set vfs.unmapped_buf_allowed=0
112 <para>Note that the following line has to be added to
113 <filename>/boot/loader.conf</filename> after a boot. It
114 disables unmapped I/O at every boot:</para>
116 <programlisting>vfs.unmapped_buf_allowed=0</programlisting>
118 <para>[2014-04-03 update] It has been reported that
119 instability may be present on virtual machines running
120 on other hypervisors, such as Xen or KVM.</para>
125 <sect1 xml:id="late-news">
126 <title>Late-Breaking News</title>
128 <para>No news.</para>