STM causes program to suddenly exit
Observed behavior:
- The below program exits with return code 0 between the call to 'error "derp2"' and the call to 'error "derp"'
- If the statement 'error "derp2"' is uncommented, the program will terminate with an exception.
- The program only exits without output with -O. And in particular, with no-ignore-interface-pragmas.
Expected behavior:
- The program should terminate with an exception regardless of whether 'error "derp2"' is commented out or not.
module Main where
import Control.Concurrent.STM
import Control.Concurrent.STM.TVar
data A = A String deriving (Eq, Show)
data E = E {
a :: TVar [Int],
b :: TVar A,
c :: TVar [Int]
}
consistency_1 :: E -> STM Bool
consistency_1 = \e -> do
_ <- readTVar $ c e
return True
installSanityChecks :: E -> IO ()
installSanityChecks e = do
x e
error "derp"
x e = do
atomically $ mapM_ installCheck [
consistency_1
]
-- error "derp2"
where
installCheck check = always $ check e
main :: IO ()
main = do
state <- initialize
installSanityChecks state
initialize :: IO E
initialize = E <$> newTVarIO [] <*> newTVarIO (A "USD") <*> newTVarIO []
Build options: (Remove -O and it will show the error)
/home/mburge/tmp/ghc/ghc-8.2.1/build/bin/ghc \
-O \
-package-id base-4.10.0.0 \
-package-id stm-2.4.4.1-2iQ3ZIiQ6vc4AnCVcs8oMd \
app/Main.hs \
-package-db /home/mburge/.stack/snapshots/x86_64-linux/nightly-2017-08-24/8.2.1/pkgdb
I used a fresh copy of GHC installed from here: https://www.haskell.org/ghc/download.html
Trac metadata
Trac field | Value |
---|---|
Version | 8.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/stm |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |