#11181: Program hands forever in sched_yield() / yield() unless -N is limited ---------------------------------------+---------------------------------- Reporter: patrick_thomson | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Solaris Architecture: x86_64 (amd64) | Type of failure: Runtime crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: ---------------------------------------+---------------------------------- We have a web application executable that, when run with -N24 (on our 24-core machine) hangs indefinitely, taking up 100% CPU. Introspecting with strace reveals that it's stuck in {{{yield}}} (on native SmartOS) and {{{shed_yield}}} (on both SmartOS LX and Linux emulation with KVM). If we run with +RTS -N2 -RTS, we do not observe this behavior. Attached is the output of truss(1) on an instance of a hung process. Other possibly-relevant information: this is an instance of the Warp web server and the Snap framework. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11181 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler