Hello Rich, Wednesday, January 25, 2006, 10:43:44 PM, you wrote: RF> I'm wondering if there exists a full description of bug fixes between RF> GHC 6.4 and 6.4.1. RF> The short one on the GHC web site only details new features. RF> Specifically, I'm interested to know if there were any changes to the RF> concurrency/threading RF> portion of GHC? I'm encountering some nasty FFI/threading issues that RF> are causing GHC RF> 6.4 to crash. yes, at least one was reported by me and fixed in 6.4.1. i attached my test case for this bug and it is the description: enclosed program demostrates either bug in GHC 6.2.1/win32 or bug in my mind :) algorithm: 1. we create several threads with forkOS 2. each thread calls C function 3. C function in each thread made several calls back to Haskell 4. called Haskell functions do some work with memory 5. all these threads ended because C function returns 6. we create another several threads... after repeating these steps several times program crashes -- Best regards, Bulat mailto:bulatz@HotPOP.com