Strange GHC/STM behaviour

[Simon Marlow]

On 15/03/2010 22:03, Simon Marlow wrote:
> On 15/03/10 16:02, Michael Lesniak wrote:
>> Hello Simon,
>>
>> with 6.12.1.20100313 the behaviour is worse: even when using $! in the
>> appropiate lines (see [2] in my original message) the programs hangs
>> quite often. Hence, 6.12.1 works better in this (special?) case.
>
> Ok, I'll look into it, thanks for the report.

I reproduced the deadlock, and it looks like a new one: a lock order 
reversal between Schedule.c:checkBlackHoles() and RtsAPI.c:rts_unlock(). 
  It turns out I've already fixed it in the HEAD as a side effect of 
some other improvements, so I'm going to try to bring those into the 
6.12.2 branch.

Cheers,
	Simon