#7653: incorrect handling of StackOverflow exception in the event manager ---------------------------------+------------------------------------------ Reporter: nus | Owner: tibbe Type: bug | Status: patch Priority: normal | Milestone: Component: libraries/base | Version: 7.7 Keywords: | Os: Linux Architecture: Unknown/Multiple | Failure: Runtime crash Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): Thank you for explanation. Your patch can be applied to GHC/Event/TimerManager.hs. Unfortunately, the following error happens with/without your patches: {{{ rplfrk: user error (Pattern match failure in do expression at libraries/base GHC/Event/Thread.hs:212:3-10) }}} The code is here: {{{ getSystemTimerManager :: IO TM.TimerManager getSystemTimerManager = do Just mgr <- readIORef timerManager return mgr }}} What should getSystemTimerManager do when readIORef returns Nothing? -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7653#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler