Segfault in RSAGL with +RTS -G4

[Simon Marlow]

Christopher Lane Hinson wrote:
> 
> I regret that I don't have a simpler failure case, but I'm just going to 
> post this and please advise me.  I don't see how to get debugging 
> symbols to work to even look at a core dump.
> 
> Usually I get a segfault, but sometimes I get this:
> 
> _rsagl_modelview: internal error: evacuate: strange closure type 2053
>     (GHC version 6.10.1 for i386_unknown_linux)
>     Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
> Aborted
> 
> This program uses ffi, but in this checkin I've disabled RSAGL's ffi 
> except the GLUT+OpenGL bindings.  So it's OpenGL or ghc.
> 
> The key to getting this error is the -G flag.  -G4 or -G3 segfaults.
> 
> Steps to replicate:
> 
> git clone http://www.downstairspeople.org/git/rsagl.git
> cd rsagl/
> git checkout possible_rts_bug_g4
> cabal configure && cabal build
> ./dist/build/_rsagl_modelview/_rsagl_modelview +RTS -G4 -RTS
> <-- just sit and wait, it should display an animation briefly and then 
> segfault.

Could you check whether this still happens with 6.10.2, and if so, please 
report it via http://hackage.haskell.org/trac/ghc/wiki/ReportABug.

Cheers,
	Simon