#4934: threadWaitRead works incorrectly on nonthreaded RTS ------------------------------------------------+-------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Runtime System | Version: 7.0.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Incorrect result at runtime | (amd64) Test Case: | Difficulty: Blocking: | Unknown | Blocked By: | Related Tickets: ------------------------------------------------+-------------------------- Comment (by slyfox): 0003-rts-posix-Select.c-throw-exception-to-reader-as-soon.patch adds another step to kill thread on '''threadWaitRead'''. Now it works as: {{{ [1 of 1] Compiling Main ( a.hs, a.o ) Linking a ... a: awaitEvent: invalid argument (Bad file descriptor) a: user error (If you can read this, shutdownHaskellAndExit did not exit.) }}} The problem is the status of killed thread. RTS thinks it did not finish, but blocked on FFI call: {{{ $ ./a +RTS -D{s,i,r,S,z} cap 0: thread 1 stopped (blocked on a read operation) thread 1 @ 0x7fd2fa405390 is blocked on read from fd 12 (TSO_DIRTY) scheduler: checking for threads blocked on I/O (waiting) found bad READ fd=12 cap 0: raising exception in thread 1. Waking up blocked thread 1 cap 0: running thread 1 (ThreadRunGHC) a: awaitEvent: invalid argument (Bad file descriptor) cap 0: thread 1 stopped (suspended while making a foreign call) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4934#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler