#10629: threadWaitRead throws BlockedIndefinitelyOnMVar -------------------------------------+------------------------------------- Reporter: | Owner: simonmar facundo.dominguez | Status: new Type: bug | Milestone: Priority: normal | Version: 7.10.1 Component: Runtime System | Keywords: Resolution: | concurrency sockets Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonmar): `BlockedIndefinitelyOnMVar` is thrown when the thread is blocked on an `MVar` that isn't reachable from anywhere else, which means that it will never be woken up. There are two possibilities: - the exception is being thrown erroneously (unlikely, I'd guess) - the IO manager has somehow lost the `MVar` that the thread is waiting on. You could proceed by instrumenting code below `GHC.Event` to find out what happens to the `MVar` the thread is waiting on. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10629#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler