ehlo,
As I already mention in [1] the ticket #2743 should be also fixed in stable branches as well. It migh cause serious performance regression. It depends on allocator.
BTW another solution is to remove integrity check because bug with corrupted cache is alredy fixed in sssd-1.12
LS
[1] https://lists.fedorahosted.org/pipermail/sssd-devel/2015-August/024295.html