Segfault on x86 with -O2

Hi, Some changes in the last 8 days fixed segfault on 32bit x86 with -O2: http://ghc.haskell.org/trac/ghc/ticket/7953 I read recent log messages but I cannot guess which commits fixed this bug. Does anyone guess? P.S. Thanks to this, now I started running Mighty with multicore IO manager on mew.org. I'm watching whether or not multicore IO manager works stably in the real world. --Kazu