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For details see: https://downloads.isc.org/isc/bind9/9.16.49/doc/arm/html/notes.html#notes-for-bind-9-16-49 "Bug Fixes A regression in cache-cleaning code enabled memory use to grow significantly more quickly than before, until the configured max-cache-size limit was reached. This has been fixed. [GL #4596] Using rndc flush inadvertently caused cache cleaning to become less effective. This could ultimately lead to the configured max-cache-size limit being exceeded and has now been fixed. [GL #4621] The logic for cleaning up expired cached DNS records was tweaked to be more aggressive. This change helps with enforcing max-cache-ttl and max-ncache-ttl in a timely manner. [GL #4591] It was possible to trigger a use-after-free assertion when the overmem cache cleaning was initiated. This has been fixed. [GL #4595]" Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org> Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>