#13970: Segmentation fault inside threadPaused -------------------------------------+------------------------------------- Reporter: albertov | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.2.1-rc3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): I have managed to reproduce it a few times although it does seem to take a while. Moreover, it (perhaps not surprisingly) is quite dependent upon paralellism. I was unable to reproduce it in a reasonable amount of time on my dual-core, four-thread laptop. However, on my 4-core, eight-thread server I was able to reproduce it within ten minutes or so. How many cores does your test environment have? Also, for the sake of My first step is to test whether the fix to #13615 is to blame; the problem indeed appears to be a race condition and instrumenting the code can easily hide the problem. For instance, I was unable to reproduce the issue even once while running the program under `rr` overnight. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13970#comment:22 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler