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Although 'dns_fetch_t' fetch can have two associated events, one for
each of 'DNS_EVENT_FETCHDONE' and 'DNS_EVENT_TRYSTALE' types, the
dns_resolver_cancelfetch() function is designed in a way that it
expects only one existing event, which it must cancel, and when it
happens so that 'stale-answer-client-timeout' is enabled and there
are two events, only one of them is canceled, and it results in an
assertion in dns_resolver_destroyfetch(), when it finds a dangling
event.
Change the logic of dns_resolver_cancelfetch() function so that it
cancels both the events (if they exist), and in the right order.
(cherry picked from commit
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| bind9 | ||
| dns | ||
| irs | ||
| isc | ||
| isccc | ||
| isccfg | ||
| ns | ||
| win32/bindevt | ||
| .gitignore | ||
| Kyuafile | ||
| Makefile.in | ||