scavenge_mutable_list: strange object?

I sometimes get this error:

internal error: scavenge_mutable_list: strange object? 3

( large program, running on debian linux on i368, compiled with ghc-6.0 -pgmc gcc-2.95 --make -O2 -fvia-C -funbox-strict-fields ) what can I do to a) work around this, b) help finding/fixing the reason? -- -- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ -- -- joe@informatik.uni-leipzig.de -- phone/fax (+49) 341 9732 204/209 --