id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3578	internal error: evacuate(static): strange closure type 42	nccb	igloo	"I have a concurrent program (using CHP, which sits on top of STM+forkIO), that is able to produce this error on GHC 6.12.1-rc1 (which doesn't appear on your version drop-down):

chp-boids: internal error: evacuate(static): strange closure type 42
    (GHC version 6.12.0.20091010 for i386_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Aborted

It produces it much sooner with +RTS -N2 than +RTS -N1, but both settings can produce the error.  The output doesn't look like it will be very useful to you -- what can I run to give a better output?
"	merge	closed	high	6.12.1	Runtime System	6.13	fixed			Linux	x86		Unknown