Benjamin Bannier updated MESOS-6216:
    Attachment: build.log

Attached a trimmed build log showing a likely related issue, 

This build was configured with {{--enable-libevent --enable-ssl}} on centos-7.

> LibeventSSLSocketImpl::create is not thread-safe, but used as if it were
> ------------------------------------------------------------------------
>                 Key: MESOS-6216
>                 URL: https://issues.apache.org/jira/browse/MESOS-6216
>             Project: Mesos
>          Issue Type: Bug
>          Components: security
>            Reporter: Benjamin Bannier
>         Attachments: build.log
> {{LibeventSSLSocketImpl::create}} is called whenever a potentially 
> ssl-enabled socket is created. It in turn calls {{openssl::initialize}} which 
> calls a function {{reinitialize}} using {{os::setenv}}. Here {{os::setenv}} 
> is used to set up SSL-related libprocess environment variables 
> Since {{os::setenv}} is not thread-safe just like the {{::setenv}} it wraps, 
> any code calling functions like {{os::getenv}} (via or {{os::environment}}) 
> concurrently with the first invocation of {{LibeventSSLSocketImpl::create}} 
> perform unsynchronized r/w access to the same data structure in the runtime.
> We usually perform most setup of the environment before we start the 
> libprocess runtime with {{process::initialize}} from a {{main}} function, see 
> e.g., {{src/slave/main.cpp}} or {{src/master/main.cpp}} and others. It 
> appears that we should move the setup of libprocess' SSL environment 
> variables to a similar spot.

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