[erlang-bugs] async driver in multithread mode - segmentation fault

[Dmitriy Kargapolov]

Hi,
I was trying to implement asynchronous driver which is invoked in a 
separate thread. It crashes with "segmentation fail" message when second 
call is issued, in driver_async().

I'm attaching dummy short test which shows the problem. I intentionally 
removed from the code most of driver_free() calls to reduce potential 
problem source.

following command makes it failed:
erl +A4 -noshell -s drv t -s init stop
but no-thread-pool one works fine:
erl -noshell -s drv t -s init stop

Tested in R11-0, R11-2, smp and non-smp Linux.
Any idea / help is appreciated.
Thanks.
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