Limit leader schedule search space (#8468) (#8486)

automerge

core/src/validator.rs

@@ -6,7 +6,7 @@ use crate::{
     commitment::BlockCommitmentCache,
     contact_info::ContactInfo,
     gossip_service::{discover_cluster, GossipService},
-    poh_recorder::PohRecorder,
+    poh_recorder::{PohRecorder, GRACE_TICKS_FACTOR, MAX_GRACE_SLOTS},
     poh_service::PohService,
     rewards_recorder_service::RewardsRecorderService,
     rpc::JsonRpcConfig,
@@ -308,7 +308,13 @@ impl Validator {
             bank.tick_height(),
             bank.last_blockhash(),
             bank.slot(),
-            leader_schedule_cache.next_leader_slot(&id, bank.slot(), &bank, Some(&blockstore)),
+            leader_schedule_cache.next_leader_slot(
+                &id,
+                bank.slot(),
+                &bank,
+                Some(&blockstore),
+                GRACE_TICKS_FACTOR * MAX_GRACE_SLOTS,
+            ),
             bank.ticks_per_slot(),
             &id,
             &blockstore,