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1.x: fix replay() retaining reference to the child Subscriber#4229
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This is a medium impact bug so it would be great if it made into tomorrow's release. /cc @artem-zinnatullin @zsxwing |
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In #3470, a flat cache of Subscribers has been introduced that is versioned and gets only updated if there are new Subscribers coming, old Subscribers leaving and a value comes through - improving performance if lots of Subscribers come and go between main onNext signals. This cache is not cleared but rebuilt therefore child Subscribers unsubscribing were still referenced through it and everything beyond - leading to memory leak on sensitive systems.
The fix is to cut the link to the child Subscriber in
InnerProduceron unsubscription. A secondary action also empties the cache if all Subscribers are gone.Reported in #4228 .