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  • Glasgow Haskell Compiler
  • GHCGHC
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  • #16011

Closed
Open
Opened Dec 08, 2018 by Andreas Klebinger@AndreasKDeveloper

GHCi leaks memory even with -fno-it.

GHCi leaks are not exactly new, but this one is especially easy to trigger/reproduce.

The memory allocated by f never gets freed.

PS E:\binary-perf> ..\ghc-8.6.1\bin\ghci.exe -fno-it
GHCi, version 8.6.1: http://www.haskell.org/ghc/  :? for help
Prelude> f = [1 .. 20000000] :: [Int]
Prelude> length f
20000000
Prelude> f = [1 .. 20000001] :: [Int]
Prelude> length f
20000001
Prelude> f = [1 .. 20000002] :: [Int]
Prelude> length f
20000002
Prelude> f = [1 .. 20000000] :: [Int]
Prelude> length f
20000000
Prelude>

Or using head and even simpler:

PS E:\binary-perf> ..\ghc_commonAsm\inplace\bin\ghci.exe -fno-it
GHCi, version 8.7.20181207: http://www.haskell.org/ghc/  :? for help
Loaded package environment from E:\binary-perf\.ghc.environment.x86_64-mingw32-8.7.20181207
Prelude> f = replicate 2000000 False
Prelude> length f
2000000
Prelude> f = replicate 2000000 False
Prelude> length f
2000000
Prelude> f = replicate 2000000 False
Prelude> length f
2000000
Prelude> f = replicate 2000000 False
Prelude> length f

GHC just keeps using more and more memory when I repeat this.

Trac metadata
Trac field Value
Version 8.7
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
8.6.3
Milestone
8.6.3
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#16011