Adar Dembo created KUDU-1624:

             Summary: Possible data races in util/trace
                 Key: KUDU-1624
             Project: Kudu
          Issue Type: Bug
          Components: util
    Affects Versions: 1.0.0
            Reporter: Adar Dembo
         Attachments: rpc_stub-test.txt

I'm running clang 3.9 against a Kudu source tree using libcpp, so it's possible 
this is partly due to differences in how libstdc++ implements std::vector. Or 
maybe it's real.

At first glance, it looks like the problem is that 
Trace::MetricsToJSON(JsonWriter*) doesn't hold lock_ while accessing 
child_traces_. It would need to some refactoring to avoid taking lock_ 
recursively, though, since it's a recursive function.

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