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Address use after free between view, resolver and nta.

See merge request !3941

Hold a weak reference to the view so that it can't go away while
nta is performing its lookups.  Cancel nta timers once all external
references to the view have gone to prevent them triggering new work.

(cherry picked from commit 0b2555e8)

Resolve "lib/isc/nothreads/include/isc/mutex.h:20:12: error: right-hand operand of comma expression has no effect"

See merge request !3925

Merge branch '2068-spnego-c-1430-2-error-len-may-be-used-uninitialized-in-this-function-on-arm-v9_11' into 'v9_11'

Silence 'may be used uninitialized'

See merge request !3933

(cherry picked from commit 8a4dd255)

[v9_11] Remove arm64 jobs from GitLab CI

See merge request !3923

The only arm64 runner we have at our disposal is suffering from
intermittent connectivity issues which make it unusable for extended
periods of time.  Remove arm64 jobs from GitLab CI until we manage to
set up an arm64 runner with more reliable connectivity.

(cherry picked from commit 49f245f7)

Merge branch '2030-bind-arm-incorrectly-documents-the-processing-of-forwarders-still-has-the-pre-9-3-0-explanation-v9_11' into 'v9_11'

[v9_11] Update description of forwarding behavior in ARM

See merge request !3918

(cherry picked from commit 30e126ad)

Marka dns r badtsig map to formerr v9 11

See merge request !3915

(cherry picked from commit 88ff6b84)

Now that the log message has been printed set the result code to
DNS_R_FORMERR.  We don't do this via dns_result_torcode() as we
don't want upstream errors to produce FORMERR if that processing
end with DNS_R_BADTSIG.

(cherry picked from commit 20488d6a)

[v9_11] Various system test fixes

See merge request !3899

[v9_11] Only run system tests as root in developer mode

See merge request !3902

Running system tests with root privileges is potentially dangerous.
Only allow it when explicitly requested (by building with
--enable-developer).

(cherry picked from commit 3ef106f6)

Resolve "RPZ wildcard passthru ignored"

See merge request !3874

Whenever an exact match is found by dns_rbt_findnode(),
the highest level node in the chain will not be put into
chain->levels[] array, but instead the chain->end
pointer will be adjusted to point to that node.

Suppose we have the following entries in a rpz zone:
example.com     CNAME rpz-passthru.
*.example.com   CNAME rpz-passthru.

A query for www.example.com would result in the
following chain object returned by dns_rbt_findnode():

chain->level_count = 2
chain->level_matches = 2
chain->levels[0] = .
chain->levels[1] = example.com
chain->levels[2] = NULL
chain->end = www

Since exact matches only care for testing rpz set bits,
we need to test for rpz wild bits through iterating the nodechain, and
that includes testing the rpz wild bits in the highest level node found.

In the case of an exact match, chain->levels[chain->level_matches]
will be NULL, to address that we must use chain->end as the start point,
then iterate over the remaining levels in the chain.

Merge branch '2043-dns_rdata_hip_next-fails-to-return-isc_r_nomore-at-the-right-time-v9_11' into 'v9_11'

Resolve "dns_rdata_hip_next() fails to return ISC_R_NOMORE at the right time."

See merge request !3886

(cherry picked from commit bcd049f1)

Also fixes extraneous white space at end of record when
there are no rendezvous servers.

(cherry picked from commit 78db46d7)

Remove few lines in unix socket handling

See merge request !3883

Reuse the same checks two times, make difference minimal.

(cherry picked from commit 72d81c47)

Prevent crash on dst initialization failure

See merge request !3879

server might be created, but not yet fully initialized, when fatal
function is called. Check both server and task before attaching
exclusive task.

(cherry picked from commit c5e7152c)

[v9_11] Rationalize backtrace logging

See merge request !3870

Failed test should be checked for core files et al. and have
backtrace generated.

GDB backtrace generated via "thread apply all bt full" is too long for
standard output, lets save them to .txt file among other log files.

additional text edits to ARM

See merge request !3863

Merge 9.11.21 release branch

See merge request !3862