internal error: weird activation record found on stack: 9

Hi, I'm getting this error in my software every now and then: postmaster: internal error: scavenge_stack: weird activation record found on stack: 9 Please report this as a bug to glasgow-haskell-bugs@haskell.org, or http://www.sourceforge.net/projects/ghc/ The process runs just fine for several days, and then it crashes with this message out of the sudden. There is no apparent cause. I'm using a fairly recent CVS ghc to compile the program on Linux/x86. Any idea what I can do to help tracking this bug down? Peter