This follow-up is just to add some missing details to the log, since
this is getting some traffic now.
A query that reproduces the crash is: ldapsearch -E 'mv=(cn={*)(sn=*)'
It was introduced by "ITS#7942 plug leak in controls": commit 9d991339
on master, ffd0f03b on RE24. vrFilter_free was broken for a long time,
but was never called until the leak was fixed in that ITS.
hope that helps,
Ryan