investigate unreliability in test-dns-any

[Trott]

• Version: v14.0.0-pre (master branch)
• Platform: n/a
• Subsystem: dns

What steps will reproduce the bug?

Run test/internet/test-dns-any.js over and over.

How often does it reproduce? Is there a required condition?

About 50% of the time, but 100% of the time if you run it over and over.

What is the expected behavior?

The test will consistently pass, or consistently fail.

What do you see instead?

It passes sometimes, fails other times.

Additional information

The problem seems to be that Google's DNS servers sometimes return a whole bunch of records with an ANY query on google.com and other times only return A and AAAA. But the test expects all the records. You can verify the aforementioned Google DNS behavior (which may very well be correct for all I know) by running nslookup -type=ANY google.com 8.8.8.8 on the command line (on UNIX) over and over. Sometimes, you get a lot of records, and other times only A and AAAA.

[Trott]

@nodejs/dns

[Trott]

I am now unable to reproduce this locally but it is happening in CI (e.g., https://ci.nodejs.org/job/node-test-commit-custom-suites-freestyle/12504/console).

[Trott]

I am, however, still able to reproduce this from the command line on the CI host using nslookup so this is (again) confirmed to not be a Node.js problem. I'm thinking of seeing what happens if we simply remove the google.com test from the file, as there are other tests for ANY queries in the file.