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  • #14959

Closed
Open
Opened Mar 21, 2018 by darchon@trac-darchon

Heap overflow in optimizer

Compiling the following with optimisations:

module Test where

import Data.Bits (setBit)

f = foldl setBit 0 [x | (x,_) <- zip [0..] [1]] :: Integer

fails with:

$ ghc -O0 -fforce-recomp Test.hs
[1 of 1] Compiling Test             ( Test.hs, Test.o )
$ ghc -O -fforce-recomp Test.hs
[1 of 1] Compiling Test             ( Test.hs, Test.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.4.1 for x86_64-unknown-linux):
	heap overflow

Fails on 8.0.2, 8.2.2, and 8.4.1

Trac metadata
Trac field Value
Version 8.4.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Edited Mar 10, 2019 by Ryan Scott
Assignee
Assign to
8.4.2
Milestone
8.4.2 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#14959