[ ghc-Bugs-1219920 ] socketToHandle, hGetContents cause errors in ghci

Bugs item #1219920, was opened at 2005-06-13 14:34
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Andrew Pimlott (pimlott)
Assigned to: Nobody/Anonymous (nobody)
Summary: socketToHandle, hGetContents cause errors in ghci

Initial Comment:
I wrote a server using socketToHandle and hGetContents.
 The first request worked fine, but the second request
crashed with "internal error: scavenge_stack: weird
activation record found on stack: 9".  I tried to
create a test case.  I couldn't reproduce the same
problem, but I did get an intermittent "Bad file
descriptor".  I think it may be a related problem, and
it may have to do with garbage collection (based on a
strace showing a call to getrusage).

The program is below, and when I run it with runghc and
feed it a line of input with nc, it crashes on the 17th
request.  It's not important to me that you fix it; in
fact I only tried this as an experiment to simplify
some working code.  But if you would like more
information, let me know.

I am using the Debian package ghc6 6.4-4.

import Network.Socket
import System.IO

main = do 
  s <- socket AF_INET Stream 0
  h <- inet_addr "127.0.0.1"
  bindSocket s (SockAddrInet 1236 h)
  listen s 5 
  loop s 

loop listenSock = do
  (s,_) <- accept listenSock
  h <- socketToHandle s ReadMode
  input <- hGetContents h
  putStrLn (take 10 input)
  send s "got it\n"
  sClose s
  loop listenSock


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