Merge changes from topic "presubmit-am-ebf0c4a183434029abdd838752cea936" into tm-dev

* changes:
  [automerged blank] C2Allocator: protetct memory mappings from race condition 2p: 5cbca291a6 2p: 1d42f8d432
  [automerge] C2Allocator: protetct memory mappings from race condition 2p: 5cbca291a6
  C2Allocator: protetct memory mappings from race condition