Bulat Ziganshin wrote:
Hello ,
yes, i found this famous "-c" bug! the humor of situation is what easiest way to got this bug is to run ghc itself! :) it seems that noone except me tried this ever. i just found that any large enough module raises this error!!! that, for example, results of compiling Data.Map module:
ghc Map.hs -cpp +RTS -c
ghc.EXE: internal error: update_fwd: unknown/strange object 39004 Please report this as a bug to glasgow-haskell-bugs@haskell.org, or http://www.sourceforge.net/projects/ghc/
ghc 6.4.1/mingw32. the error is absolutely reproducible, so at least now we had case, even lot of cases :)
or you wanna a smaller program? :)
I think this may be a different bug - I can reproduce it, but not with the current STABLE branch. It is probably the freeze/thaw bug that was fixed after 6.4.1. However, I've still seen strange crashes in STABLE when using +RTS -c. We build stage 3 of the nightly build with +RTS -c every night, and right now we aren't getting any crashes, but a few weeks ago we were. When I looked into it, I couldn't get a deterministically repeatable crash - every tiny change made the crash go away. Cheers, Simon