Ondřej Surý and Mark Andrews 0279cc76a7
Update STALE and ANCIENT header attributes atomically ...
The ThreadSanitizer found a data race when updating the stale header.
Instead of trying to acquire the write lock and failing occasionally
which would skew the statistics, the dns_rdatasetheader_t.attributes
field has been promoted to use stdatomics. Updating the attributes in
the mark_header_ancient() and mark_header_stale() now uses the cmpxchg
to update the attributes forfeiting the need to hold the write lock on
the tree. Please note that mark_header_ancient() still needs to hold
the lock because .dirty is being updated in the same go.
(cherry picked from commit 81d4230e60
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Ondřej SurýandMark Andrews
0279cc76a7