The &os; Project $FreeBSD$ 2017 The &os; Documentation Project &tm-attrib.freebsd; &tm-attrib.intel; &tm-attrib.sparc; &tm-attrib.general; This document lists errata items for &os; &release;, containing significant information discovered after the release or too late in the release cycle to be otherwise included in the release documentation. This information includes security advisories, as well as news relating to the software or documentation that could affect its operation or usability. An up-to-date version of this document should always be consulted before installing this version of &os;. This errata document for &os; &release; will be maintained until the release of &os; &release.next;. This errata document contains late-breaking news about &os; &release; Before installing this version, it is important to consult this document to learn about any post-release discoveries or problems that may already have been found and fixed. Any version of this errata document actually distributed with the release (for example, on a CDROM distribution) will be out of date by definition, but other copies are kept updated on the Internet and should be consulted as the current errata for this release. These other copies of the errata are located at , plus any sites which keep up-to-date mirrors of this location. Source and binary snapshots of &os; &release.branch; also contain up-to-date copies of this document (as of the time of the snapshot). For a list of all &os; CERT security advisories, see . &security; &errata; &os;/&arch.i386; installed on ZFS may crash during boot when the ZFS pool mount is attempted while booting an unmodified GENERIC kernel. A system tunable has been added as of revision r286584 to make the kern.kstack_pages tunable configurable without recompiling the kernel. To mitigate system crashes with such configurations, choose Escape to loader prompt in the boot menu and enter the following lines from &man.loader.8; prompt, after an OK: set kern.kstack_pages=4 boot Add this line to /boot/loader.conf for the change to persist across reboots: kern.kstack_pages=4 [2017-07-21] Due to a bug in earlier versions of &man.clang.1; that is difficult to work around in the upgrade process, to upgrade the system from sources via buildworld to -CURRENT or &release;, it is necessary to upgrade machines running 9.x to at least revision r286035, or machines running 10.x to revision r286033. Source-based upgrades from 10.3-RELEASE are not affected. This differs from the historical situation where one could generally upgrade from anywhere on earlier stable branches, so caution should be exercised. No news.