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Created by Michał Kępień@michalOwner

"resolver" test fails intermittently

The recently-added (only on main) check for a SERVFAIL response to a TCP query with an empty question section fails pretty frequently. The check was added in commit 2f3ded76 (part of !5616 (merged)). Despite a code comment suggesting otherwise, the test fails due to dig hitting a timeout instead of receiving a SERVFAIL response:

$ cat dig.ns5.out.70

; <<>> DiG 9.17.21 <<>> -p 29349 @10.53.0.5 -b 10.53.0.5 +tcp tcpalso.no-questions. a +tries=3 +time=4
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached

Example occurrences:

Most of these happened on FreeBSD, but two happened on Linux (under TSAN), so the common denominator seems to be "machine under load" rather than "only happens on FreeBSD".

Edited by Michał Kępień