Comment #3 on issue 3949 by [email protected]: Object circular leak via
some v8 internals
https://code.google.com/p/v8/issues/detail?id=3949
Leaks due to descriptor array sharing have been fixed for a fairly long
time. The problem was the following:
Map A with property a transitions to map B with property b. The descriptor
array of A and B would be the same, so they would contain both a and b.
Even though B dies, b stays alive.
Now we have a special form of weakness in the descriptor array. While
marking A, we only mark a. If B dies, we trim off b from the descriptor
array.
So if you'd look at retaining paths, it might seem like a map is retaining
an object, even though it isn't, due to weakness of part of the descriptor
array.
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