diff --git a/src/cmd/compile/internal/gc/main.go b/src/cmd/compile/internal/gc/main.go
index e47b8a8a9c..33fbb90be4 100644
--- a/src/cmd/compile/internal/gc/main.go
+++ b/src/cmd/compile/internal/gc/main.go
@@ -1223,7 +1223,7 @@ func concurrentBackendAllowed() bool {
 		return false
 	}
 	// TODO: Test and delete these conditions.
-	if objabi.Fieldtrack_enabled != 0 || objabi.Preemptibleloops_enabled != 0 || objabi.Clobberdead_enabled != 0 {
+	if objabi.Fieldtrack_enabled != 0 || objabi.Clobberdead_enabled != 0 {
 		return false
 	}
 	// TODO: fix races and enable the following flags
diff --git a/src/cmd/compile/internal/ssa/loopreschedchecks.go b/src/cmd/compile/internal/ssa/loopreschedchecks.go
index cc6cb52972..30ba1e9d66 100644
--- a/src/cmd/compile/internal/ssa/loopreschedchecks.go
+++ b/src/cmd/compile/internal/ssa/loopreschedchecks.go
@@ -179,7 +179,9 @@ func insertLoopReschedChecks(f *Func) {
 		if p.i != 0 {
 			likely = BranchUnlikely
 		}
-		bb.Likely = likely
+		if bb.Kind != BlockPlain { // backedges can be unconditional. e.g., if x { something; continue }
+			bb.Likely = likely
+		}
 
 		// rewrite edge to include reschedule check
 		// existing edges: