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The 'query_usestale()' function was only called when in
'query_gotanswer()' and an unexpected error occurred. This may have
been "quota reached", and thus we were in some cases returning
stale data on fetch-limits (and if serve-stale enabled of course).
But we can also hit fetch-limits when recursing because we are
following a referral (in 'query_notfound()' and
'query_delegation_recurse()'). Here we should also check for using
stale data in case an error occurred.
Specifically don't check for using stale data when refetching a
zero TTL RRset from cache.
Move the setting of DNS_DBFIND_STALESTART into the 'query_usestale()'
function to avoid code duplication.
(cherry picked from commit
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| bind9 | ||
| dns | ||
| irs | ||
| isc | ||
| isccc | ||
| isccfg | ||
| ns | ||
| samples | ||
| win32/bindevt | ||
| .gitignore | ||
| Kyuafile | ||
| Makefile.in | ||