Comment #5 on issue 3645 by [email protected]: MSan vs. Serializer: Fight!
https://code.google.com/p/v8/issues/detail?id=3645

You can unpoison the object before passing it to OutputRawData(). However, because we don't want to unpoison the actual heap memory, you'd have to copy it to a temporary buffer first. That's kind of ugly, even if done only under #ifdef MEMORY_SANITIZER.

The crash most likely happens somewhere within an overridden SnapshotByteSink::Put(). Depending on what exactly is going on there, there might be a more elegant solution. It's hard to say without seeing the report.

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