[PATCH] malloc: Fix attached thread reference count handling [BZ #19243]

[Florian Weimer]

This patch does not address the deadlock scenario around list_lock and
the fork handler.

I tried various different approaches, and there is an immediate
temptation to introduce proper synchronization into the arena selection
logic.  This is why I went with the minimal change for now.

The test, while racy, is extremely reliable in practice.  It usually
crashes within one or two seconds.  I have never seen it succeeding
without the fix.

Florian
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