"use after free" crashbug in DMD (and fix)

[ketmar via Digitalmars-d]

On Sun, 01 Feb 2015 03:27:06 +0000, ketmar wrote:

> On Sun, 01 Feb 2015 03:09:15 +0000, ZombineDev wrote:
> 
>> I have made a pull request[1] with your fix, if you don't mind.
> thank you.

ah, and that caching is needed. `free()` in `AsyncRead::dispose` *can* be 
executed before loop in `startthread` finishes, so `startthread` will try 
to dereference `aw->filesdim` and hit the same "use after free" bug.

multithreaded code is a very fragile thing. ;-)
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