diff --git a/chain/gen/slashfilter/slashfilter.go b/chain/gen/slashfilter/slashfilter.go
index a73f3e2f6..cb12ddb08 100644
--- a/chain/gen/slashfilter/slashfilter.go
+++ b/chain/gen/slashfilter/slashfilter.go
@@ -2,6 +2,7 @@ package slashfilter
 
 import (
 	"fmt"
+
 	"github.com/filecoin-project/lotus/build"
 
 	"golang.org/x/xerrors"
@@ -27,7 +28,9 @@ func New(dstore ds.Batching) *SlashFilter {
 }
 
 func (f *SlashFilter) MinedBlock(bh *types.BlockHeader, parentEpoch abi.ChainEpoch) error {
-	if bh.Height < build.UpgradeOrangeHeight+build.Finality {
+	if bh.Height > build.UpgradeOrangeHeight-build.Finality &&
+		bh.Height < build.UpgradeOrangeHeight+build.Finality {
+		// consenssus faults disabled during Upgrade Orange
 		return nil
 	}
 
diff --git a/chain/vm/syscalls.go b/chain/vm/syscalls.go
index ba6ee2f1d..b063e5f25 100644
--- a/chain/vm/syscalls.go
+++ b/chain/vm/syscalls.go
@@ -17,6 +17,7 @@ import (
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/crypto"
 	"github.com/filecoin-project/go-state-types/network"
+	"github.com/filecoin-project/lotus/build"
 	"github.com/filecoin-project/lotus/chain/actors/adt"
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
@@ -107,11 +108,20 @@ func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime2.Conse
 		return nil, xerrors.Errorf("cannot decode second block header: %f", decodeErr)
 	}
 
+	// workaround chain halt
+	if blockA.Height > build.UpgradeOrangeHeight-build.Finality &&
+		blockA.Height < build.UpgradeOrangeHeight+build.Finality {
+		return nil, xerrors.Errorf("consensus reporting disabled around Upgrade Orange")
+	}
+	if blockB.Height > build.UpgradeOrangeHeight-build.Finality &&
+		blockB.Height < build.UpgradeOrangeHeight+build.Finality {
+		return nil, xerrors.Errorf("consensus reporting disabled around Upgrade Orange")
+	}
+
 	// are blocks the same?
 	if blockA.Cid().Equals(blockB.Cid()) {
 		return nil, fmt.Errorf("no consensus fault: submitted blocks are the same")
 	}
-
 	// (1) check conditions necessary to any consensus fault
 
 	// were blocks mined by same miner?