FreeBSD 12.0-RELEASE Release Notes
The release notes for FreeBSD 12.0-RELEASE contain a summary of the changes made to the FreeBSD base system on the 12-STABLE development line. This document lists applicable security advisories that were issued since the last release, as well as significant changes to the FreeBSD kernel and userland. Some brief remarks on upgrading are also presented.
Table of Contents
This document contains the release notes for FreeBSD 12.0-RELEASE. It describes recently added, changed, or deleted features of FreeBSD. It also provides some notes on upgrading from previous versions of FreeBSD.
The release distribution to which these release notes apply represents the latest point along the 12-STABLE development branch since 12-STABLE was created. Information regarding pre-built, binary release distributions along this branch can be found at https://www.FreeBSD.org/releases/.
The release distribution to which these release notes apply represents a point along the 12-STABLE development branch between 11.2-RELEASE and the future 13.0-RELEASE. Information regarding pre-built, binary release distributions along this branch can be found at https://www.FreeBSD.org/releases/.
This distribution of FreeBSD 12.0-RELEASE is a release distribution. It can be found at https://www.FreeBSD.org/releases/ or any of its mirrors. More information on obtaining this (or other) release distributions of FreeBSD can be found in the Obtaining FreeBSD' appendix to the FreeBSD Handbook.
All users are encouraged to consult the release errata before installing FreeBSD. The errata document is updated with "late-breaking" information discovered late in the release cycle or after the release. Typically, it contains information on known bugs, security advisories, and corrections to documentation. An up-to-date copy of the errata for FreeBSD 12.0-RELEASE can be found on the FreeBSD Web site.
This document describes the most user-visible new or changed features in FreeBSD since 11.2-RELEASE. In general, changes described here are unique to the 12-STABLE branch unless specifically marked as MERGED features.
Typical release note items document recent security advisories issued after 11.2-RELEASE, new drivers or hardware support, new commands or options, major bug fixes, or contributed software upgrades. They may also list changes to major ports/packages or release engineering practices. Clearly the release notes cannot list every single change made to FreeBSD between releases; this document focuses primarily on security advisories, user-visible changes, and major architectural improvements.
Upgrading from Previous Releases of FreeBSD
[amd64,i386] Binary upgrades between RELEASE versions (and snapshots of the various security branches) are supported using the freebsd-update(8) utility. The binary upgrade procedure will update unmodified userland utilities, as well as unmodified GENERIC kernels distributed as a part of an official FreeBSD release. The freebsd-update(8) utility requires that the host being upgraded have Internet connectivity.
Source-based upgrades (those based on recompiling the FreeBSD
base system from source code) from previous versions are supported,
according to the instructions in
Upgrading FreeBSD should only be attempted after backing up all data and configuration files.
Security and Errata
This section lists the various Security Advisories and Errata Notices since 11.2-RELEASE.
No errata notices.
This section covers changes and additions to userland applications, contributed software, and system utilities.
Userland Configuration Changes
LDNS now enables
Userland Application Changes
xlint and the ability to build lint libraries or lint source code has been removed.
gdb(1) utility included in the base system is now installed to
/usr/libexec for use with
crashinfo(8) . The gdbserver and gdbtui utilities are no longer
installed. For interactive debugging,
lldb(1) or a modern version of
devel/gdb should be used. A new
WITHOUT_GDB_LIBEXEC has been
added to disable building
gdb(1) . The
gdb(1) utility is still installed in
sha224(1) utility has been added.
bhyve(8) utility has been updated to add a new subcommand to
which when used, prints a list of supported LPC and PCI devices,
[r338210] (Sponsored by
The ELF Tool Chain has been updated to version r3614. [r333063] (Sponsored by The FreeBSD Foundation)
The clang, llvm, lld, lldb, compiler-rt utilities and libc++ have been updated to version 6.0.1. [r335799]
The bsnmp utility has been updated to version 1.13. [r335885]
The WPA utilities have been updated to version 2.6. [r336203]
Source-based upgrades from FreeBSD 11.x and earlier require the
ntpd UID (123) and GID (123) to exist before the
installworld target is run. See the "rebuild
everything and install" section of
UPDATING for the
documented procedure for source-based upgrades for more
The lua utility has been updated to version 5.3.5. [r337810]
OpenSSH has been updated to version 7.8p1. [r338561]
Serf has been updated to version 1.3.9. [r339256]
ACPICA has been updated to version 20181003. [r339262]
Unbound has been updated to version 1.8.1. [r339278]
The timezone database files have been updated to version 2018g. [r339937]
OpenSSL has been updated to version 1.1.1a. [r340711]
Installation and Configuration Tools
Runtime Libraries and API
This section covers changes to kernel configurations, system tuning, and system control parameters that are not otherwise categorized.
Kernel Bug Fixes
The ACPI subsystem has been updated to implement
Device object types for ACPI 6.0 support, required for
some Dell, Inc. Poweredge™ AMD® Epyc™ systems.
[r326956] (Sponsored by Dell EMC
An issue with IPv6-AH IPSEC padding has been fixed to match RFC4302. [r334625] (Sponsored by Dell EMC Isilon)
VIMAGE kernel configuration option has been
enabled by default.
dumpon(8) utility has been updated to add support for
compressed kernel crash dumps when the kernel configuration file
GZIO option. See
dumpon(8) for additional information.
[r324965] (Sponsored by Dell EMC
dumpon(8) utility has been updated to add support for
zstd(1) -compressed kernel crash dumps when the kernel
configuration file includes the
ZSTDIO option. See
dumpon(8) for additional information.
[r329240] (Sponsored by Dell EMC
NETDUMP kernel configuration options have been
enabled by default for amd64, i386, aarch64, powerpc, powerpc64,
and sparc64 architectures.
A new kernel configuration option,
KASSERT_PANIC_OPTIONAL, has been added that allows
KASSERT(9) behavior changes without necessarily invoking
panic(9) . The option is disabled by default.
[r338214] (Sponsored by Dell EMC
NUMA option has been enabled by default in the
[r338602] (Sponsored by Dell EMC Isilon,
Devices and Drivers
This section covers changes and additions to devices and device drivers since 11.2-RELEASE.
Support for the Microchip® LAN78xx™ USB3-GigE controller has been added. [r333713] (Sponsored by The FreeBSD Foundation)
The netdump(4) driver has been added, providing a facility through which kernel crash dumps can be transmitted to a remote host after a system panic. See netdump(4) and dumpon(8) for more information and configuration details. [r333283] (Sponsored by Dell EMC Isilon)
cxgbe(4) driver has been updated to provide hardware support
setsockopt(2) option when the kernel configuration contains the
[r334143] (Sponsored by Chelsio
The DRM driver for modern graphics chipsets has been marked
deprecated and marked for removal in FreeBSD 13. The DRM kernel
modules are available from
graphics/drm-legacy-kmod in the Ports Collection as
well as via
pkg(8) . Additionally, the kernel modules have been added to
module_blacklist, as installation
from the Ports Collection or
pkg(8) is strongly recommended.
This section covers general hardware support for physical machines, hypervisors, and virtualization environments, as well as hardware changes and updates that do not otherwise fit in other sections of this document.
Support for powernv POWER9 MMU initialization has been added. [r333273]
FreeBSD has changed the way graphics drivers are handled on amd64 and i386. Graphics drivers for modern ATI/AMD® and Intel® graphics cards are now available in the Ports Collection. The base drivers are still available and will be installed by default, but they lack support for current generation laptop and desktop systems.
In most cases it is enough to install
graphics/drm-kmod from ports or packages to install a
driver appropriate for the system, then adding the appropriate
For Intel® (i915) systems after Broadwell™, the rc.conf(5) entry is:
Systems with ATI/AMD® graphics cards have two options. Modern systems starting with the HD7000 series GPU should use:
Systems with cards released before the HD7000 GPU use:
Users must be added to the
video GID after installing
graphics/drm-kmod in order for X to start
There are known issues with the
x11-drivers/xf86-video-ati when using
graphics drivers from the base system;
x11-drivers/xf86-video-ati-legacy should be used
There is a known issue where booting with UEFI and using the ATI/AMD® graphics driver may cause the screen to be garbled before the appropriate driver is loaded. For additional information regarding graphics support on FreeBSD, please see the Graphics Wiki Page.
to the EC2™ user-data.
Amazon® EC2™ AMI instances now use the Amazon® internal NTP service by default. [r326565]
Amazon® EC2™ AMI instances now disable the PS/2 keyboard and mouse devices by default, reducing overall boot time by 2.5 seconds. [r338321]
Support for the USB OTG serial terminal has been enabled on arm systems by default. [r335004] (Sponsored by The FreeBSD Foundation)
The armv6 and armv7 images now default to boot with EFI. [r336998]
Support has been added for building aarch64 images for the
This section covers changes and additions to file systems and other storage subsystems, both local and networked.
The UFS/FFS filesystem has been updated to support check hashes to cylinder-group maps. Support for check hashes is available only for UFS2. [r323923]
The UFS/FFS filesystem has been updated to consolidate
BIO_DELETE commands, reducing read/write requests
due to fewer TRIM messages being sent simultaneously.
[r338056] (Sponsored by
TRIM consolidation support has been enabled by default in the
UFS/FFS filesystem. TRIM consolidation can be disabled by setting
0, or adding
[r338517] (Sponsored by
The NFS version 4.1 server has been updated to include pNFS server support. [r335012]
Boot Loader Changes
This section covers the boot loader, boot menu, and other boot-related changes.
Boot Loader Changes
This section describes changes that affect networking in FreeBSD.
SO_REUSEPORT_LB option has been added to the
network stack, allowing multiple programs or threads to bind to the
same port, and incoming connections load balanced using a hash
[r334719] (Sponsored by Limelight
pf(4) ioctl interface and
pfctl(8) now support
altq(4) bandwidth parameters of
2^32 bps or
greater. The HFSC discipline has been upgraded to operate correctly
with bandwidth parameters up to 100 Gbps, and bandwidth parameters
supplied to the non-upgraded disciplines will now be saturated at
the prior 32-bit limit.
Ports Collection and Package Infrastructure
This section covers changes to the FreeBSD Ports Collection, package infrastructure, and package maintenance and installation tools.
The pkg(8) utility has been updated to verson 1.10.5_5.
KDE has been updated to version 5.12.5.
Perl has been updated to version 5.26.2.
Python has been updated to version 2.7.
Release Engineering and Integration
This section convers changes that are specific to the FreeBSD Release Engineering processes.
The FreeBSD/i386 memory stick installation images have been changed to use the MBR partitioning scheme instead of GPT to address boot issues with some BIOSes. [r332446] (Sponsored by The FreeBSD Foundation)
The FreeBSD/amd64 memory stick installation images have been changed to use the MBR partitioning scheme instead of GPT to address boot issues with some BIOSes. [r334337] (Sponsored by The FreeBSD Foundation)
Last modified on: June 19, 2021 by Danilo G. Baio