Peter Argany 6770b53f8d Added lock around RN module initialization to fix crash
Summary:
T35879909 is a UBN caused by a race condition in RN initialization. I haven't been able to repro, but the crash logs point to a bad memory access in this method. Another thread must be deallocating something concurrently.

This is a quick fix to patch into v197.

Reviewed By: fkgozali

Differential Revision: D12904277

fbshipit-source-id: 5740183f9a7c8f2c45ca627662891cb0c1048764
2018-11-02 11:29:18 -07:00
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