[GHC] #15595: Stack overflow in withArgs leads to infinite memory-consuming loop

2 Sep 2018

      #15595: Stack overflow in withArgs leads to infinite memory-consuming loop
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           Reporter:  NeilMitchell    |             Owner:  (none)
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:  8.6.1
          Component:  Compiler        |           Version:  8.4.3
           Keywords:                  |  Operating System:  Windows
       Architecture:  x86_64 (amd64)  |   Type of failure:  Runtime crash
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 Given the program:

 {{{#!hs
 import System.Environment

 main :: IO ()
 main = do
     putStrLn "Starting"
     withArgs (replicate 1000 "") $ return ()
 }}}

 When run with:

 {{{
 ghc --make WithArgsBug.hs -rtsopts && WithArgsBug +RTS -K1K
 }}}

 The program prints out "Starting", then loops forever, taking 1 CPU core
 and allocating memory (approx 1Gb per min), until the computer is
 unresponsive. The program does not respond to Ctrl-C and has to be killed
 from the task manager.

 The {{{-K1K}}} flag limits the stack to approx 33Kb.

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15595
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