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It also uses hists/hist_entries, hists__init() should be called before creating any evsels. Otherwise no extra space will be allocated per perf_evsel nor this space will be initialized when allocating a new perf_evsel instance, resulting in reads/writes to non allocated space, oops. Fix it. Signed-off-by: Kan Liang <kan.liang@intel.com> Link: http://lkml.kernel.org/r/1414004561-22096-1-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>