shinrich commented on a change in pull request #7117:
URL: https://github.com/apache/trafficserver/pull/7117#discussion_r471844107
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File path: iocore/hostdb/HostDB.cc
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@@ -1588,6 +1588,12 @@ HostDBContinuation::set_check_pending_dns()
this->setThreadAffinity(this_ethread());
HostDBContinuation *c = q.head;
for (; c; c = static_cast<HostDBContinuation *>(c->link.next)) {
+ if (c == this) {
+ Warning("Skip the insertion of the same continuation to pending dns");
+ return false;
Review comment:
One concern about this change is that if this continuation was the first
request, returning false here will cause the caller to change the continuation
handler. There will be no continuation that will do the
HostDBContinuation::dnsEvent.
Maybe the probeEvent handler deals with it, but I'm not sure.
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