In the shutdown system test multiple queries are sent to a resolver
instance, in the meantime we terminate the same resolver process for
which the queries were sent to, either via rndc stop or a SIGTERM
signal, that means the resolver may not be able to answer all those
queries, since it has initiated the shutdown process.
The dnspython library raises a dns.resolver.NoNameservers exception when
a resolver object fails to receive an answer from the specified list
of nameservers (resolver.nameservers list), we need to handle this
exception as this is something that may happen since we asked the
resolver to terminate, as a result it may not answer clients even if
an answer is available, as the operation will be canceled.
(cherry picked from commit b19cd2d83b)
PyLint 2.8.2 reports the following suggestions for two Python scripts
used in the system test suite:
************* Module tests_rndc_deadlock
bin/tests/system/addzone/tests_rndc_deadlock.py:71:4: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
************* Module tests-shutdown
bin/tests/system/shutdown/tests-shutdown.py:68:4: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
bin/tests/system/shutdown/tests-shutdown.py:157:8: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
Implement the above suggestions by using
concurrent.futures.ThreadPoolExecutor() and subprocess.Popen() as
context managers.
(cherry picked from commit a8163551ed)
The pytest "cacheprovider" plugin produces a .cache/v/cache/lastfailed
file, which holds a Python dictionary structure with failed tests.
However, on Ubuntu 16.04 (Xenial) the file is created even though the
test passed and the file contains just an empty dictionary ("{}").
Given that we are not interested in this feature, disabling the
"cacheprovider" plugin globally and removing per-test removals of the
.cache directory seems like the best course of action.
(cherry picked from commit e1c3034107)
If we don't wait for named to finish starting, 'rndc stop' may
fail due to the listen limit being reached in named leading
to a false negative test
(cherry picked from commit 8d5870f9df)
Any CI job:
- I:dnssec:file dnssec/ns1/trusted.keys not removed
- I:rpzrecurse:file rpzrecurse/ns3/named.run.prev not removed
system:gcc:sid:amd64:
- I🪞file mirror/ns3/_default.nzf not removed
system:gcc:xenial:amd64:
- I:shutdown:file shutdown/.cache/v/cache/lastfailed not removed
(cherry picked from commit 14a104d121)
the test server running in shutdown/resolver was not logging
any debug info, which made it difficult to diagnose test failures.
(cherry picked from commit cc7ceace7d)
This test ensures that named will correctly shutdown
when receiving multiple control connections after processing
of either "rncd stop" or "kill -SIGTERM" commands.
Before the fix, named was crashing due to a race condition happening
between two threads, one running shutdown logic in named/server.c
and other handling control logic in controlconf.c.
This test tries to reproduce the above scenario by issuing multiple
queries to a target named instance, issuing either rndc stop or kill
-SIGTERM command to the same named instance, then starting multiple rndc
status connections to ensure it is not crashing anymore.
(cherry picked from commit 042e509753)
