Segmentation faults in profiled way

It seems that profiling has regressed sometime between GHC 8.0 and 8.2. A few times since September I have noticed that profiled programs (in particular, GHC itself built with profiling enabled) seem to segmentation fault.

This most recent case was produced by building commit 6ebfbdfb with the following in build.mk,

BuildFlavour = prof

define add_mods_flag =
  $(foreach mod,$(2),$(eval $(basename $(mod))_HC_OPTS += $(1)))
endef

$(call add_mods_flag,-fprof-auto,$(wildcard compiler/typecheck/*.hs))

STRIP_CMD = :

and using the resulting stage2 compiler to bootstrap the same commit. Eventually the build will fail with a segmentation fault. Unfortunately it seems the crash isn't entirely reproducible.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture