Merge tag 'v9_15_6' into merge-v9_15_6

diff --cc CHANGES
index 8ea140de3b9e50bfea54f782adc7b740e435fbd2,82d1ea501efd1c9b14403c65b88711296c1ea0ab..c7eefd5c1afb86dfe7597e066485265c1bb29511
--- 1/CHANGES
--- 2/CHANGES
+++ b/CHANGES
@@@ -1,10 -1,5 +1,12 @@@
 +5322. [placeholder]
 +
 +5321. [bug]           Obtain write lock before updating version->records
 +                      and version->bytes. [GL #1341]
 +
 +5320. [cleanup]       Silence TSAN on header->count. [GL #1344]
 +
+       --- 9.15.6 released ---
+ 
  5319. [func]          Trust anchors can now be configured using DS
                        format to represent a key digest, by using the
                        new "initial-ds" or "static-ds" keywords in