[GHC] #14358: GHCi does not exit after heap overflow exception

16 Oct 2017

      #14358: GHCi does not exit after heap overflow exception
-------------------------------------+-------------------------------------
           Reporter:  ferdinandvw    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Start GHCi as follows `ghci +RTS -M20m`

 Enter the following
 {{{#!hs
...
let xs = [1..10^6] :: [Int]
Data.List.foldl' (+) 0 xs
 }}}
This results in (as expected):
 `*** Exception: heap overflow`

 However, GHCi did not exit.
 Entering any expression will result in the above given exception.

 And if you try to reload GHCi the following panic error will be produced:
 {{{#!hs
 Ok, 0 modules loaded.
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.2.1 for x86_64-unknown-linux):
         heap overflow

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

 I tried the same using GHC 7.10.3 and 8.0.2. In both cases GHCi would exit
 after the initial heap overflow exception. With 8.2.1 this does not
 happen.

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14358
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler