FreeBSD 11.0-RELEASE Errata

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Last modified on 2016-10-10 15:49:49Z by gjb.

Abstract

This document lists errata items for FreeBSD 11.0-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 + FreeBSD.

This errata document for FreeBSD 11.0-RELEASE + will be maintained until the release of FreeBSD 11.1-RELEASE.

Table of Contents

1. Introduction
2. Security Advisories
3. Errata Notices
4. Open Issues
5. Late-Breaking News

1. Introduction

This errata document contains “late-breaking news” + about FreeBSD 11.0-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of this errata document actually distributed + with the release (for example, on a CDROM distribution) will be + out of date by definition, but other copies are kept updated on + the Internet and should be consulted as the “current + errata” for this release.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 + https://www.FreeBSD.org/releases/, + plus any sites + which keep up-to-date mirrors of this location.

Source and binary snapshots of FreeBSD 11.0-STABLE also + contain up-to-date copies of this document (as of the time of + the snapshot).

For a list of all FreeBSD CERT security advisories, see + https://www.FreeBSD.org/security/.

2. Security Advisories

Advisory	Date	Topic
No advisories.

3. Errata Notic es

Errata	Date	Topic
No errata notices.

4. Open Issues

An issue was discovered with Amazon® EC2™ + images which would cause the virtual machine to hang during + boot when upgrading from previous FreeBSD versions. New + EC2™ installations are not affected, but exisiting + installations running earlier releases are advised to wait + until the issue is resolved in an Errata Notice before + upgrading. An Errata Notice to address this is planned + following the release.
FreeBSD/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, + chose Escape to loader prompt in the boot + menu and enter the following lines from 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
```
A bug was diagnosed in interaction of the + pmap_activate() function and + TLB shootdown IPI + handler on amd64 systems which have PCID + features but do not implement the INVPCID + instruction. On such machines, such as SandyBridge™ + and IvyBridge™ microarchitectures, set the loader + tunable vm.pmap.pcid_enabled=0 during + boot:
```
set vm.pmap.pcid_enabled=0
+boot
```
Add this line to + /boot/loader.conf for the change to + persist across reboots:
To check if the system is affected, check + dmesg(8) for PCID listed in the + "Features2", and absence of + INVPCID in the "Structured Extended + Features". If the PCID feature is + not present, or INVPCID is present, + system is not affected.
```
vm.pmap.pcid_enabled=0
```
The Release Notes errorneously states the + WITH_SYSTEM_COMPILER src.conf(5) + option is enabled by default, however this was disabled + prior to the final release build.

5. Late-Breaking News

No news.

All users of FreeBSD 11.0-STABLE should + subscribe to the <stable@FreeBSD.org> + mailing list.