#7715: threadDelay causes segfault on Mac if compiled by 32bit GHC -----------------------------+---------------------------------------------- Reporter: kazu-yamamoto | Owner: Type: bug | Status: new Priority: normal | Component: Compiler Version: 7.6.2 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: None/Unknown | Blockedby: Blocking: | Related: -----------------------------+---------------------------------------------- The following code causes segfault {{{ main :: IO () main = do replicateM_ 100 $ forkIO $ do threadDelay 1000000 putStrLn "Hello, world!" threadDelay 5000000 }}} if compiled with 32bit GHC head on Mac. 64bit GHC head does not cause this problem. 32bit GHC 7.4.2 does not, either. I don't see this bug both on FreeBSD and Linux. "gdb" caught the following on each run: {{{ Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x00000005 [Switching to process 51076 thread 0x20b] 0x00000005 in ?? () }}} {{{ Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x00000019 [Switching to process 50933 thread 0x20b] 0x00000019 in ?? () }}} {{{ Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x40e40348 [Switching to process 51004 thread 0x20b] 0x00f28aa5 in base_GHCziEventziPSQ_atMostzuzdszdwatMosts_info () }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7715 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler