Lars Volker created IMPALA-6824:

             Summary: Crash in RuntimeProfile::EventSequence::AddNewerEvents() 
when events_ is empty
                 Key: IMPALA-6824
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 2.12.0
            Reporter: Lars Volker
            Assignee: Lars Volker

When {{events_}} is empty in runtime-profile-counters.h:347, events_.back() is 
undefined. This can lead to a crash. The fix is to check for 
{{events_.empty()}} before calling {{back()}}.

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