https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64058
--- Comment #4 from Igor Zamyatin <izamyatin at gmail dot com> --- Partition maps differ 216303: Partition 0 (_1 - 1 101 200 252 267 316 348 ) .... Partition 16 (l1_lsm.7_159 - 106 159 238 253 ) and for 216304: Partition 3 (l1_lsm.7_58 - 58 106 238 253 315 316 ) .... Partition 31 (u1_lsm.6_252 - 101 252 267 314 348 ) And also for 216304 there is Coalesce list: (267)u1_lsm.6_252 & (315)l1_lsm.7_58 [map: 70, 4] : Fail due to conflict although for 216303 there is Coalesce list: (1)_1 & (253)l1_lsm.7_159 [map: 0, 32] : Fail due to conflict