[ ghc-Bugs-1285326 ] scavenge_one: strange object 47

Bugs item #1285326, was opened at 2005-09-08 20:18
Message generated for change (Comment added) made by tuananhbirm
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Category: None
Group: None
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: tuananhbirm (tuananhbirm)
Assigned to: Nobody/Anonymous (nobody)
Summary: scavenge_one: strange object 47

Initial Comment:

Hi, i am running GHC 6.4, in Redhat 9, running
sometimes with flag -threaded on.


Please look at the file Mult.hs

and function: startM1 (17-20)

run this function for different inputs (orignially,
multiply (1%7) with (0%2)) try to run with : (1%3) and
(0%1)
                  (2%3) and (0%1)
                  (1%2) and (0%1)
                  (1%5) and (0%1)


Best regards
TuanAnh



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>Comment By: tuananhbirm (tuananhbirm)
Date: 2005-09-13 09:46

Message:
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 The program is supposed to compute an infinite list, so it
would never finish (however i never see the error after
100-150 digits). 

If you always get the result of [1,0,0,0,0.....     , then
try with inputs whose denominators are not power of 2 (like
(1%3 and 1%3)                                              
        or (1%3 and 3%5)) ...

Best regards
TuanAnh

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Comment By: Simon Marlow (simonmar)
Date: 2005-09-13 08:47

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After fixing the bug, I ran the test program for about
30mins and it still hadn't finished.  Is there a way to run
it for, say, 5 seconds?

The fix will be in version 6.4.1.

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Comment By: tuananhbirm (tuananhbirm)
Date: 2005-09-12 18:23

Message:
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 what do you mean by "allow it to run for a shorter time" ? 

btw, how do i use the fixed version of ghc ? (is there a
patch for this bug or something similar ? )

Thanks a lot
TuanAnh


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Comment By: Simon Marlow (simonmar)
Date: 2005-09-12 15:56

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Fixed now, thanks for a good report.

I'd like to use this as a test case - how can I provide
inputs that allow it to run for a shorter time?

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