https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77493
--- Comment #10 from David Abdurachmanov <david.abdurachmanov at gmail dot com> --- We have been bitten by DSE with TBB already on GCC 6.2.0. I decided to try -fno-lifetime-dse on the first bad commit and got some surprising results. Now it fails with: pure virtual method called terminate called without an active exception In this case we have a standard library container with 7 elements, std::shared_ptr<TrackingRecHit>, where TrackingRecHit is abstract class, which has: virtual int dimension() const = 0; If I dump the actual type: typeid(*(x.get())).name() the actual object is of MuonTransientTrackingRecHit type. Then the code does std::stable_sort on the collection and now in some cases MuonTransientTrackingRecHit changes to TrackingRecHit (abstract class). Thus we are really calling pure virtual method. This does not happen on x86_64. I guess, this could be caused by actual MuonTransientTrackingRecHit being destroyed if the last std::shared_ptr point to it goes away. DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit DUMP_BEFORE: std::shared_ptr<TrackingRecHit const> DUMP_BEFORE_TYPE: MuonTransientTrackingRecHit // after std::stable_sort DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: MuonTransientTrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: MuonTransientTrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: TrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: TrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: MuonTransientTrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: TrackingRecHit DUMP: std::shared_ptr<TrackingRecHit const> DUMP_TYPE: TrackingRecHit SIZE: 7
