http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49786
--- Comment #13 from Martin Jambor <jamborm at gcc dot gnu.org> 2011-07-21 13:00:31 UTC --- The problem in the summary is a call graph verification error, which is most likely a duplicate of PR 49796 (an infrastructure/verifier problem really) while the problem reported in comment #10 is "caller edge count is negative" which is most certainly a different error. I ran a profiled LTO bootstrap overnight but unfortunately could not reproduce neither. Nevertheless, I will try to follow Ian's suggestion. Ian, was there anything specific that you did in order to reproduce the issue? Thanks.