in dev val rel_0 (but probably in earier nightlies), there are many leaks reported by hephaistus in egamma emtrkrefitter , see the end of the log file:
http://atlas-computing.web.cern.ch/atlas-computing/links/distdirectory/nightlies/developmentwebarea/nicos_web_area16x0val32bs5g4recopt/nicos_testlog_rel_0/reconstruction_recexample_recexrecotest_32__recexrecotest_testconfiguration__esdz_nopers_memleak__a.html