Fix premature decision in the presence of type-dependent expression
operands on whether AltiVec vector initializations from single
expressions are "splat" operations.
Verify that the instantiation is able to determine the correct cast
semantics for both the scalar type and the vector type case.
Note that, because the change only affects the single-expression case
(and the target type is an AltiVec-style vector type), the
replacement of a parenthesized list with a parenthesized expression
does not change the semantics of the program in a program-observable
manner.
This should fix 'Assertion failed: (isScalarType()), function
getScalarTypeKind, file /usr/src/contrib/llvm-project/clang/lib/AST
/Type.cpp, line 2146', when building the graphics/opencv-core port for
powerpc64le.
Join to AllHosts multicast group again when adding an existing IPv4 address.
When SIOCAIFADDR ioctl configures an IPv4 address that is already exist,
it removes old ifaddr. When this IPv4 address is only one configured on
the interface, this also leads to leaving from AllHosts multicast group.
Then an address is added again, but due to the bug, this doesn't lead
to joining to AllHosts multicast group.
NAT64LSN requires the presence of upper level protocol header
in a IPv4 datagram to find corresponding state to make translation.
Now it will be handled automatically by nat64lsn instance.
eliminate possible race in parallel TLB shootdown IPI
On the target side TLB shootdown IPI handler, prevent the compiler
from performing a forward store optimization which may mask a
subsequent update to the scoreboard by the initiator.
Reported by: Max Laier, Anton Rang
Discussed with: kib
Sponsored by: Dell EMC Isilon
John Baldwin [Tue, 13 Oct 2020 18:04:19 +0000 (18:04 +0000)]
Add support to the KTLS OCF module for AES-CBC MTE ciphersuites.
This is a simplistic approach which encrypts each TLS record in two
separate passes: one to generate the MAC and a second to encrypt.
This supports TLS 1.0 connections with implicit IVs as well as TLS
1.1+ with explicit IVs.
Robert Wing [Tue, 13 Oct 2020 18:00:23 +0000 (18:00 +0000)]
ctl.conf(5): fix LUN size in UCL format example.
Remove quotes around size in the LUN section and change the suffix to 'GB'. The
UCL format does recognize 'G' on its own, which uses a base 10 multiplier where
'GB' uses a 2 power multiplier.
Document the difference between valid suffixes when using ctl.conf(5) in the
general syntax form or in UCL format.
John Baldwin [Tue, 13 Oct 2020 17:30:34 +0000 (17:30 +0000)]
Permit sending empty fragments for TLS 1.0.
Due to a weakness in the TLS 1.0 protocol, OpenSSL will periodically
send empty TLS records ("empty fragments"). These TLS records have no
payload (and thus a page count of zero). m_uiotombuf_nomap() was
returning NULL instead of an empty mbuf, and a few places needed to be
updated to treat an empty TLS record as having a page count of "1" as
0 means "no work to do" (e.g. nothing to encrypt, or nothing to mark
ready via sbready()).
Brooks Davis [Tue, 13 Oct 2020 17:14:30 +0000 (17:14 +0000)]
libgssapi: modernize static string array use
Use designated initializers to document positions in the arrays rather
than requiring counting. Use nitems() rather than rolling it by hand to
count elements.
Also, passify a Clang 12 warning about suspcious string concatenation
within an array initializer by adding parentheses.
Andrew Turner [Tue, 13 Oct 2020 16:51:05 +0000 (16:51 +0000)]
Use adrp in the arm64 efi loader
On startup the arm64 efi loaders need to know PC-relative addresses.
Previously we used the adr instruction to find this address, however this
instruction is limited to +/- 1MiB.
Switch to adrp to find the 4k page the address is within and an add to
set the bottom 12 bits. This lets us address +/- 4GiB which should be
large enough for now.
Implement more RCU list functions in the LinuxKPI.
This also fixes a bug in the existing list_add_rcu() where the
prev->prev pointer was updated to the new element instead of
next->prev. Currently this function is not widely used.
Kristof Provost [Tue, 13 Oct 2020 11:04:00 +0000 (11:04 +0000)]
pf: do not remove kifs that are referenced by rules
Even if a kif doesn't have an ifp or if_group pointer we still can't delete it
if it's referenced by a rule. In other words: we must check rulerefs as well.
While we're here also teach pfi_kif_unref() not to remove kifs with flags.
Andrew Turner [Tue, 13 Oct 2020 10:26:15 +0000 (10:26 +0000)]
Fix write only mappings on arm64
When trapping on a wrote access to a buffer the kernel has mapped as write
only we should only pass the VM_PROT_WRITE flag. Previously the call to
vm_fault_trap as the VM_PROT_READ flag was unexpected.
Alex Richardson [Tue, 13 Oct 2020 08:14:33 +0000 (08:14 +0000)]
Stop using -O instead of -O2 for MIPS
Until clang 11 that was equivalent to -O2, but clang changed it to -O1 so
generated MIPS code will now be unnecessarily slow. It also removes a weird
special case from sys.mk.
This is similar to the D26471 change for debug kernels and should not change
anything since everything was previously building MIPS code at -O2 until the
clang 11 update.
Warner Losh [Tue, 13 Oct 2020 04:37:57 +0000 (04:37 +0000)]
Force __BMI__ experimental instructions off.
The OpenZFS code that uses the BMI instructions is broken. Forcibly
disable them to prevent their use. When enabled, the build breaks.
This fixes the build when compiled for a core with BMI instructions.
This is the same fix committed in r364777, for the same issue.
Warner Losh [Mon, 12 Oct 2020 22:19:07 +0000 (22:19 +0000)]
Add zstd support to the boot loader.
Add support to the _STANDALONE environment enough bits of the kernel
that we can compile it. We still have a small zstd_shim.c since there
were 3 items that were a bit hard to nail down and may be cleaned up
in the future. These go hand in hand with a number of commits to
sys/sys in the past weeks, should this need be MFCd.
Discussed with: mmacy (in review and on IRC/Slack)
Reviewed by: freqlabs (on openzfs repo)
Differential Revision: https://reviews.freebsd.org/D26218
Warner Losh [Mon, 12 Oct 2020 22:07:44 +0000 (22:07 +0000)]
newbus: use ssize_t to match sb's len and size, fix ordering of space check
Both s_len and s_size are ssize_t, so their differece is also more
properly a ssize_t not a size_t. Also, assert that len is <= size when
we enter. This should always be the case. Ensure that we have that one
byte that we write to the end of the buffer before we do so, though
the error should already be set on the buffer if not, and the only
times we supply 'partial' buffers they should be plenty large.
Reviewed by: cem, jhb (prior version, I did cem's suggestion)
Differential Revsion: https://reviews.freebsd.org/D26752
Ian Lepore [Mon, 12 Oct 2020 18:02:51 +0000 (18:02 +0000)]
Bug fixes for the ads111x driver... make configurable gain and sample rate
hints work on per-channel basis as documented, rather than chip-wide. Also,
when configured via hints, return BUS_PROBE_NOWILDCARD on successful hints
match, so that the hints don't bogusly match other types of i2c chips.
Kristof Provost [Mon, 12 Oct 2020 12:41:10 +0000 (12:41 +0000)]
pf tests: Test that 'set skip on <group>' works on new group members
There's a know issue where new group members don't get the 'set skip on'
applied until the rules are re-loaded.
Do this by setting rules that block all traffic, but skip members of the
'epair' group. If we can communicate over the epair interface we know the set
skip rule took effect, even if the rule was set before the interface was
created.
Kristof Provost [Mon, 12 Oct 2020 12:39:37 +0000 (12:39 +0000)]
pf: create a kif for flags
If userspace tries to set flags (e.g. 'set skip on <ifspec>') and <ifspec>
doesn't exist we should create a kif so that we apply the flags when the
<ifspec> does turn up.
Otherwise we'd end up in surprising situations where the rules say the
interface should be skipped, but it's not until the rules get re-applied.
Alex Richardson [Mon, 12 Oct 2020 10:42:33 +0000 (10:42 +0000)]
Enable SUBDIR_PARELLEL in lib/libclang_rt
I noticed that this part of the build was taking much longer than
expected. Turns out it's due to not running the subdirs in parallel.
Reduces `make all` inside lib/libclang_rt time from 63s to 20s with -j32.
Reviewed By: dim
Differential Revision: https://reviews.freebsd.org/D26623
Alex Richardson [Mon, 12 Oct 2020 10:42:19 +0000 (10:42 +0000)]
Don't use install(1) for the library symlinks in the build directory
It appears this was changed from ln to use install in rS245752. I noticed
this because my buildenv was setting INSTALL=install -U -M //METALOG
and then these links fail to be created with the following error:
install: open //METALOG: Permission denied
Warner Losh [Mon, 12 Oct 2020 05:56:29 +0000 (05:56 +0000)]
systm.h: forward declare ucred for _STANDALONE too
There's a number of types we forward declare for the kernel. We need
struct ucred for the ZSTD ZFS integration, so go ahead and forward
declare it here too.
Emmanuel Vadot [Sun, 11 Oct 2020 16:01:16 +0000 (16:01 +0000)]
10Gigabit Ethernet driver for AMD SoC
This patch has the driver for 10Gigabit Ethernet controller in AMD
SoC. This driver is written compatible to the Iflib framework. The
existing driver is for the old version of hardware. The submitted
driver here is for the recent versions of the hardware where the Ethernet
controller is PCI-E based.
Alexey Dokuchaev [Sun, 11 Oct 2020 10:40:11 +0000 (10:40 +0000)]
The nextboot(8) manual page currently says that the loader(8) would delete
the /boot/nextboot.conf file or its contents which is 1) not the most user-
friendly way of working with custom configurations, and 2) simply not true
for both Forth and Lua implementations: they would not delete it, but just
change the setting to "NO", that is, disable it.
While at it, add one missing serial (Oxford) comma and fix some bogus line
wraps along the way.
Bjoern A. Zeeb [Sun, 11 Oct 2020 00:01:00 +0000 (00:01 +0000)]
ip_mroute: fix the viftable export sysctl
It seems that in r354857 I got more than one thing wrong.
Convert the SYSCTL_OPAQUE to a SYSCTL_PROC to properly export the these
days allocated and not longer static per-vnet viftable array.
This fixes a problem with netstat -g which would show bogus information
for the IPv4 Virtual Interface Table.
PR: 246626
Reported by: Ozkan KIRIK (ozkan.kirik gmail.com)
MFC after: 3 days
Conrad Meyer [Sat, 10 Oct 2020 21:52:00 +0000 (21:52 +0000)]
random(4) FenestrasX: Push root seed version to arc4random(3)
Push the root seed version to userspace through the VDSO page, if
the RANDOM_FENESTRASX algorithm is enabled. Otherwise, there is no
functional change. The mechanism can be disabled with
debug.fxrng_vdso_enable=0.
arc4random(3) obtains a pointer to the root seed version published by
the kernel in the shared page at allocation time. Like arc4random(9),
it maintains its own per-process copy of the seed version corresponding
to the root seed version at the time it last rekeyed. On read requests,
the process seed version is compared with the version published in the
shared page; if they do not match, arc4random(3) reseeds from the
kernel before providing generated output.
This change does not implement the FenestrasX concept of PCPU userspace
generators seeded from a per-process base generator. That change is
left for future discussion/work.
Conrad Meyer [Sat, 10 Oct 2020 21:48:06 +0000 (21:48 +0000)]
arc4random(9): Integrate with RANDOM_FENESTRASX push-reseed
There is no functional change for the existing Fortuna random(4)
implementation, which remains the default in GENERIC.
In the FenestrasX model, when the root CSPRNG is reseeded from pools due to
an (infrequent) timer, child CSPRNGs can cheaply detect this condition and
reseed. To do so, they just need to track an additional 64-bit value in the
associated state, and compare it against the root seed version (generation)
on random reads.
This revision integrates arc4random(9) into that model without substantially
changing the design or implementation of arc4random(9). The motivation is
that arc4random(9) is immediately reseeded when the backing random(4)
implementation has additional entropy. This is arguably most important
during boot, when fenestrasX is reseeding at 1, 3, 9, 27, etc., second
intervals. Today, arc4random(9) has a hardcoded 300 second reseed window.
Without this mechanism, if arc4random(9) gets weak entropy during initial
seed (and arc4random(9) is used early in boot, so this is quite possible),
it may continue to emit poorly seeded output for 5 minutes. The FenestrasX
push-reseed scheme corrects consumers, like arc4random(9), as soon as
possible.
Conrad Meyer [Sat, 10 Oct 2020 21:45:59 +0000 (21:45 +0000)]
Add "Fenestras X" alternative /dev/random implementation
Fortuna remains the default; no functional change to GENERIC.
Big picture:
- Scalable entropy generation with per-CPU, buffered local generators.
- "Push" system for reseeding child generators when root PRNG is
reseeded. (Design can be extended to arc4random(9) and userspace
generators.)
- Similar entropy pooling system to Fortuna, but starts with a single
pool to quickly bootstrap as much entropy as possible early on.
- Reseeding from pooled entropy based on time schedule. The time
interval starts small and grows exponentially until reaching a cap.
Again, the goal is to have the RNG state depend on as much entropy as
possible quickly, but still periodically incorporate new entropy for
the same reasons as Fortuna.
Notable design choices in this implementation that differ from those
specified in the whitepaper:
- Blake2B instead of SHA-2 512 for entropy pooling
- Chacha20 instead of AES-CTR DRBG
- Initial seeding. We support more platforms and not all of them use
loader(8). So we have to grab the initial entropy sources in kernel
mode instead, as much as possible. Fortuna didn't have any mechanism
for this aside from the special case of loader-provided previous-boot
entropy, so most of these sources remain TODO after this commit.
Emmanuel Vadot [Sat, 10 Oct 2020 07:18:51 +0000 (07:18 +0000)]
Brand our DTS with the Linux version it was imported from
DTS must be synced with the kernel, add a freebsd,dts-version string in
the root node of each DTS that we compile so we can later in the kernel
check that it contain a correct value.
Rick Macklem [Sat, 10 Oct 2020 00:01:40 +0000 (00:01 +0000)]
Modify mountd.c so that it does not always malloc 4K for the map credentials.
r362163 upgraded mountd so that it could handle MAX_NGROUPS
groups for the anonymous user credentials (the ones provided by
-maproot and -mapall exports options).
The problem is that this resulted in every export structure growing by
about 4Kbytes, because the cr_groups field went from 16->MAX_NGROUPS.
This patch fixes this by only including a small 32 element cr_groups in the
structure and then malloc()'ng cr_groups when a larger one is needed.
The value of SMALLNGROUPS is arbitrarily set to 32, assuming most users
used by -maproot or -mapall will be in <= 32 groups.
Navdeep Parhar [Fri, 9 Oct 2020 22:23:39 +0000 (22:23 +0000)]
cxgbe(4): More fixes for the T6 FCS error counter.
r365732 was the first attempt to get an accurate count but it was
writing to some read-only registers to clear them and that obviously
didn't work. Instead, note the counter's value when it is supposed to
be cleared and subtract it from future readings.
dev.<port>.stats.rx_fcs_error should not be serviced from the MPS
register for T6.
The stats.* sysctls should all use T5_PORT_REG for T5 and above. This
must have been missed in the initial T5 support years ago. Fix it while
here.
MFC after: 3 days
Sponsored by: Chelsio Communications
John Baldwin [Fri, 9 Oct 2020 20:20:42 +0000 (20:20 +0000)]
Don't invoke semunload() if seminit() fails during MOD_LOAD.
The module handler code invokes a MOD_UNLOAD event immediately if
MOD_LOAD fails. The result was that if seminit() failed, semunload()
was invoked twice. semunload() is not idempotent however and would
try to remove it's process_exit eventhandler twice resulting in a
panic.
Mateusz Guzik [Fri, 9 Oct 2020 19:10:00 +0000 (19:10 +0000)]
cache: fix vexec panic when racing against vgone
Use of dead_vnodeops would result in a panic instead of returning the intended
EOPNOTSUPP error.
While here make sure to abort, not just try to return a partial result.
The former allows the regular lookup to restart from scratch, while the latter
makes it stuck with an unusable vnode.
Warner Losh [Fri, 9 Oct 2020 15:29:05 +0000 (15:29 +0000)]
Avoid using single quotes in arguments to logger.
Single quotes interfere with the workaround put in with r335753 and
aren't necessary in this case. I believe that all the underling issues
with r335753 have been corrected, but need to do more extensive
followup before reverting it as a bad idea.
PR: 240411
MFC After: 2 days (to give it time to get into 12.2)
Mark Johnston [Fri, 9 Oct 2020 15:27:37 +0000 (15:27 +0000)]
col(1): Fix a couple of bugs
- When flushing extra lines after all input has been processed, make
sure that local state is reinitialized correctly.
- When -f is specified, make sure to end output with a full newline.
- Fix some style issues and update comments.
- Add some regression tests.
PR: 249308
Submitted by: Yang Zhong <yzhong@freebsdfoundation.org>
MFC after: 3 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26536
Gordon Bergling [Fri, 9 Oct 2020 15:14:19 +0000 (15:14 +0000)]
Fix a few mandoc issues
- whitespace at end of input line
- skipping paragraph macro: Pp at the end of Sh
- new sentence, new line
- consider using OS macro: Fx
- AUTHORS section without An macro
- skipping paragraph macro: Pp before Ss
Add DSCP support for network QoS to iscsi initiator.
Allow the DSCP codepoint also to be configurable
for the traffic in the direction from the initiator
to the target, such that writes and any requests
are also treated in the appropriate QoS class.
Gordon Bergling [Fri, 9 Oct 2020 14:03:45 +0000 (14:03 +0000)]
Fix a few mandoc issues
- no blank before trailing delimiter
- whitespace at end of input line
- sections out of conventional order
- normalizing date format
- AUTHORS section without An macro
Stop sending tiny new data segments during SACK recovery
Consider the currently in-use TCP options when
calculating the amount of new data to be injected during
SACK loss recovery. That addresses the effect that very small
(new) segments could be injected on partial ACKs while
still performing a SACK loss recovery.
Add IP(V6)_VLAN_PCP to set 802.1 priority per-flow.
This adds a new IP_PROTO / IPV6_PROTO setsockopt (getsockopt)
option IP(V6)_VLAN_PCP, which can be set to -1 (interface
default), or explicitly to any priority between 0 and 7.
Note that for untagged traffic, explicitly adding a
priority will insert a special 801.1Q vlan header with
vlan ID = 0 to carry the priority setting
Fix EINVAL message when CPU binding information is requested for IRQ.
`cpuset -g -x N` along with requested information always prints
message `cpuset: getdomain: Invalid argument'. The EINVAL is returned
from kern_cpuset_getdomain(), since it doesn't expect CPU_LEVEL_WHICH
and CPU_WHICH_IRQ parameters.
To fix the error, do not call cpuset_getdomain() when `-x' is specified.
Warner Losh [Fri, 9 Oct 2020 01:48:14 +0000 (01:48 +0000)]
Create in-tree LINT files
Now that config(8) has supported include for 19 years, transition to
including the NOTES files. include support didn't exist at the time,
nor did the envvar stuff recently added. Now that it does, eliminate
the building of LINT files by just including everything you need.
Note: This may cause conflicts with updating in some cases.
find sys -name LINT\* -rm
is suggested across this commit to remove the generated LINT
files.
Rick Macklem [Fri, 9 Oct 2020 01:04:28 +0000 (01:04 +0000)]
Make vn_generic_copy_file_range() interruptible via a signal.
Without this patch, when vn_generic_copy_file_range() is
doing a large copy, it will remain in the function for a
considerable amount of time, delaying handling of any
outstanding signals until the copy completes.
This patch adds checks for signals that need to be
processed after each successful data copy cycle.
When sig_intr() returns non-zero, vn_generic_copy_file_range()
will return.
The check "if (len < savlen)" ensures that some data
has been copied, so that progress will be made.
Note that, since copy_file_range(2) is allowed to
return fewer bytes copied than requested, it
will never return EINTR/ERESTART when sig_intr()
returns non-zero.
Warner Losh [Fri, 9 Oct 2020 00:27:45 +0000 (00:27 +0000)]
Stop ignoring makeLINT generated files
We're going to check these files in shortly since we don't need to
generate them anymore. Generated files cause issues for different work
flows anyway.
Warner Losh [Fri, 9 Oct 2020 00:16:26 +0000 (00:16 +0000)]
Initial support for implementing the bootXXX.efi workaround
Too many version of UEFI firmware (so far only confirmed on amd64)
don't really support efibootmgr selection of boot. That's the most
reliable, when it works, since there's no guesswork. However, many do
not save, unmolested, the variables that efibootmgr sets, so as a
fallback we also install loader.efi as bootXXX.efi (where XXX is
either aa64 or x64) if it doesn't already exist in /efi/boot on the
ESP. The standard only defines this for removable devices, but it's
almost ubiquitously used as a fallback. Many BIOSes implement a drive
selection feature that takes over the efibootmgr protocol, rendinering
it useless (either generally, or for those vendors not on the short
list). bootxxx.efi works around this. However, we don't install it
unconditionally there, as that breaks some popular multi-boot setups.
vm_page_dump_index_to_pa(): Add braces to the expression involving + and &.
The precedence of the '&' operator is less than of '+'. Added braces
do change the order of evaluation into the natural one, in my opinion.
On the other hand, the value of the expression should not change since
all elements should have page-aligned values.
This fixes a gcc warning reported.
Reported by: adrian
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Normally when a buffer with B_BARRIER is written, the flag is cleared
by g_vfs_strategy() when creating bio. But in some cases FFS buffer
might not reach g_vfs_strategy(), for instance when copy-on-write
reports an error like ENOSPC. In this case buffer is returned to
dirty queue and might be written later by other means. Among then
bdwrite() reasonably asserts that B_BARRIER is not set.
In fact, the only current use of B_BARRIER is for lazy inode block
initialization, where write of the new inode block is fenced against
cylinder group write to mark inode as used. The situation could be
seen that we break dependency by updating cg without written out
inode. Practically since CoW was not able to find space for a copy of
inode block, for the same reason cg group block write should fail.
Reported by: pho
Discussed with: chs, imp, mckusick
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26511
sig_intr(9): return early if AST is not scheduled.
Check td_flags for relevant AST requests lock-less. This opens the
race slightly wider where sig_intr() returns false negative, but might
be it is worth it.
Requested by: mjg
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Specifically, if lookup() returned any error and the topping directory
was not latched, which means that (non-existent) path did not returned
to the topping location, give ENOTCAPABLE a priority over the lookup()
error.
PR: 249960
Reviewed by: emaste, ngie
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26695
Warner Losh [Thu, 8 Oct 2020 20:56:06 +0000 (20:56 +0000)]
Remove APM BIOS support
APM BIOS was relevant only to early laptops (approximately P166 or
P200 and slower). These have not been relevant for a long time, and
this code has been untested for a long time (as far as I can
tell). The APM compat code in ACPI and the apm(8) command is not being
retired. Both of these items are still in use (apm(8) is more
scriptable than the replacement acpiconf, for the most part). This has
been commented out of i386 GENERIC since 2002. This code is not
relevant to any other port.
Mitchell Horne [Thu, 8 Oct 2020 18:29:17 +0000 (18:29 +0000)]
Fix a loop condition
The correct way to identify the end of the metadata is two adjacent
entries set to zero/MODINFO_END. I made a typo and this was checking the
first entry twice.
Reported by: rpokala
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Mitchell Horne [Thu, 8 Oct 2020 18:02:05 +0000 (18:02 +0000)]
Add a routine to dump boot metadata
The boot metadata (also referred to as modinfo, or preload metadata)
provides information about the size and location of the kernel,
pre-loaded modules, and other metadata (e.g. the EFI framebuffer) to be
consumed during by the kernel during early boot. It is encoded as a
series of type-length-value entries and is usually constructed by
loader(8) and passed to the kernel. It is also faked on some
architectures when booted by other means.
Although much of the module information is available via kldstat(8),
there is no easy way to debug the metadata in its entirety. Add some
routines to parse this data and allow it to be printed to the console
during early boot or output via a sysctl.
Since the output can be lengthly, printing to the console is gated
behind the debug.dump_modinfo_at_boot kenv variable as well as the
BOOTVERBOSE flag. The sysctl to print the metadata is named
debug.dump_modinfo.
Reviewed by: tsoome
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D26687
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