fix: align revert reason with go ethereum that expects hex-encoded result

evmd/tests/ibc/ics20_precompile_transfer_test.go

@@ -16,9 +16,9 @@ import (
 	"github.com/cosmos/evm/evmd"
 	"github.com/cosmos/evm/evmd/tests/integration"
 	"github.com/cosmos/evm/precompiles/ics20"
+	chainutil "github.com/cosmos/evm/testutil"
 	evmibctesting "github.com/cosmos/evm/testutil/ibc"
 	evmante "github.com/cosmos/evm/x/vm/ante"
-	evmtypes "github.com/cosmos/evm/x/vm/types"
 	transfertypes "github.com/cosmos/ibc-go/v10/modules/apps/transfer/types"
 	clienttypes "github.com/cosmos/ibc-go/v10/modules/core/02-client/types"
 
@@ -299,8 +299,8 @@ func (suite *ICS20TransferTestSuite) TestHandleMsgTransfer() {
 				"INVALID-DENOM-HASH",
 			)
 			suite.Require().ErrorContains(err, vm.ErrExecutionReverted.Error())
-			revertErr := evmtypes.NewExecErrorWithReason(evmRes.Ret)
-			suite.Require().Contains(revertErr.ErrorData(), "invalid denom trace hash")
+			revertErr := chainutil.DecodeRevertReason(*evmRes)
+			suite.Require().Contains(revertErr.Error(), "invalid denom trace hash")
 
 			// denomHash query method
 			evmRes, err = evmAppB.EVMKeeper.CallEVM(
@@ -347,8 +347,8 @@ func (suite *ICS20TransferTestSuite) TestHandleMsgTransfer() {
 				"",
 			)
 			suite.Require().ErrorContains(err, vm.ErrExecutionReverted.Error())
-			revertErr = evmtypes.NewExecErrorWithReason(evmRes.Ret)
-			suite.Require().Contains(revertErr.ErrorData(), "invalid denomination for cross-chain transfer")
+			revertErr = chainutil.DecodeRevertReason(*evmRes)
+			suite.Require().Contains(revertErr.Error(), "invalid denomination for cross-chain transfer")
 		})
 	}
 }

evmd/tests/ibc/v2_ics20_precompile_transfer_test.go

@@ -17,9 +17,9 @@ import (
 	"github.com/cosmos/evm/evmd"
 	"github.com/cosmos/evm/evmd/tests/integration"
 	"github.com/cosmos/evm/precompiles/ics20"
+	chainutil "github.com/cosmos/evm/testutil"
 	evmibctesting "github.com/cosmos/evm/testutil/ibc"
 	evmante "github.com/cosmos/evm/x/vm/ante"
-	evmtypes "github.com/cosmos/evm/x/vm/types"
 	transfertypes "github.com/cosmos/ibc-go/v10/modules/apps/transfer/types"
 	clienttypes "github.com/cosmos/ibc-go/v10/modules/core/02-client/types"
 
@@ -305,8 +305,8 @@ func (suite *ICS20TransferV2TestSuite) TestHandleMsgTransfer() {
 				"INVALID-DENOM-HASH",
 			)
 			suite.Require().ErrorContains(err, vm.ErrExecutionReverted.Error())
-			revertErr := evmtypes.NewExecErrorWithReason(evmRes.Ret)
-			suite.Require().Contains(revertErr.ErrorData(), "invalid denom trace hash")
+			revertErr := chainutil.DecodeRevertReason(*evmRes)
+			suite.Require().Contains(revertErr.Error(), "invalid denom trace hash")
 
 			// denomHash query method
 			evmRes, err = evmAppB.EVMKeeper.CallEVM(
@@ -353,8 +353,8 @@ func (suite *ICS20TransferV2TestSuite) TestHandleMsgTransfer() {
 				"",
 			)
 			suite.Require().ErrorContains(err, vm.ErrExecutionReverted.Error())
-			revertErr = evmtypes.NewExecErrorWithReason(evmRes.Ret)
-			suite.Require().Contains(revertErr.ErrorData(), "invalid denomination for cross-chain transfer")
+			revertErr = chainutil.DecodeRevertReason(*evmRes)
+			suite.Require().Contains(revertErr.Error(), "invalid denomination for cross-chain transfer")
 		})
 	}
 }

testutil/integration/evm/factory/factory.go

@@ -12,6 +12,7 @@ import (
 	abcitypes "github.com/cometbft/cometbft/abci/types"
 
 	"github.com/cosmos/evm/precompiles/testutil"
+	chainutil "github.com/cosmos/evm/testutil"
 	basefactory "github.com/cosmos/evm/testutil/integration/base/factory"
 	"github.com/cosmos/evm/testutil/integration/evm/grpc"
 	"github.com/cosmos/evm/testutil/integration/evm/network"
@@ -209,8 +210,7 @@ func (tf *IntegrationTxFactory) checkEthTxResponse(res *abcitypes.ExecTxResult)
 	}
 
 	if evmRes.Failed() {
-		revertErr := evmtypes.NewExecErrorWithReason(evmRes.Ret)
-		return fmt.Errorf("tx failed with VmError: %v: %s", evmRes.VmError, revertErr.ErrorData())
+		return chainutil.DecodeRevertReason(evmRes)
 	}
 	return nil
 }

testutil/util.go

@@ -1,10 +1,18 @@
 package testutil
 
 import (
+	"bytes"
 	"context"
+	"fmt"
 	"time"
 
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+
 	"github.com/cosmos/evm/crypto/ethsecp256k1"
+	evmtypes "github.com/cosmos/evm/x/vm/types"
+
+	errorsmod "cosmossdk.io/errors"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/tx"
@@ -108,3 +116,39 @@ func CreateTx(ctx context.Context, txCfg client.TxConfig, priv cryptotypes.PrivK
 
 	return txBuilder.GetTx(), nil
 }
+
+// DecodeRevertReason extracts and decodes the human-readable revert reason from an EVM transaction response.
+// It processes the raw return data (Ret field) from a failed EVM transaction and attempts to decode
+// any ABI-encoded revert messages into readable error strings.
+//
+// Returns:
+//   - error: A formatted error containing either:
+//   - "tx failed with VmError: <vmError>: <decoded_reason>" for successfully decoded reverts
+//   - "tx failed with VmError: <vmError>: <hex_data>" for non-decodable data
+//   - "failed to decode revert data: <decode_error>" if decoding fails
+//
+// Example usage:
+//
+//	res, err := executeTransaction(...)
+//	if res.VmError != "" {
+//	    decodedErr := DecodeRevertReason(res)
+//	    // decodedErr might be: "tx failed with VmError: execution reverted: ERC20: insufficient allowance"
+//	}
+func DecodeRevertReason(evmRes evmtypes.MsgEthereumTxResponse) error {
+	revertErr := evmtypes.NewExecErrorWithReason(evmRes.Ret)
+	hexData, ok := revertErr.ErrorData().(string)
+	if ok {
+		decodedBytes, err := hexutil.Decode(hexData)
+		if err == nil {
+			if len(decodedBytes) >= 4 && bytes.Equal(decodedBytes[:4], evmtypes.RevertSelector) {
+				var reason string
+				reason, err = abi.UnpackRevert(decodedBytes)
+				if err == nil {
+					return fmt.Errorf("tx failed with VmError: %v: %s", evmRes.VmError, reason)
+				}
+			}
+		}
+		return errorsmod.Wrap(err, "failed to decode revert data")
+	}
+	return fmt.Errorf("tx failed with VmError: %v: %s", evmRes.VmError, revertErr.ErrorData())
+}

x/vm/keeper/state_transition.go

@@ -444,11 +444,6 @@ func (k *Keeper) ApplyMessageWithConfig(
 	// reset leftoverGas, to be used by the tracer
 	leftoverGas = msg.GasLimit - gasUsed
 
-	// if the execution reverted, we return the revert reason as the return data
-	if vmError == vm.ErrExecutionReverted.Error() {
-		ret = evm.Interpreter().ReturnData()
-	}
-
 	return &types.MsgEthereumTxResponse{
 		GasUsed: gasUsed,
 		VmError: vmError,

x/vm/types/errors.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/crypto"
 
 	errorsmod "cosmossdk.io/errors"
@@ -122,7 +123,7 @@ func NewExecErrorWithReason(revertReason []byte) *RevertError {
 	}
 	return &RevertError{
 		error:  err,
-		reason: reason,
+		reason: hexutil.Encode(result),
 	}
 }
 

x/vm/types/errors_test.go

@@ -0,0 +1,51 @@
+package types_test
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/stretchr/testify/require"
+
+	"github.com/cosmos/evm/x/vm/types"
+)
+
+func TestNewExecErrorWithReason(t *testing.T) {
+	testCases := []struct {
+		name         string
+		errorMessage string
+		revertReason []byte
+		data         string
+	}{
+		{
+			"Empty reason",
+			"execution reverted",
+			nil,
+			"0x",
+		},
+		{
+			"With unpackable reason",
+			"execution reverted",
+			[]byte("a"),
+			"0x61",
+		},
+		{
+			"With packable reason but empty reason",
+			"execution reverted",
+			types.RevertSelector,
+			"0x08c379a0",
+		},
+		{
+			"With packable reason with reason",
+			"execution reverted: COUNTER_TOO_LOW",
+			hexutil.MustDecode("0x08C379A00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000F434F554E5445525F544F4F5F4C4F570000000000000000000000000000000000"),
+			"0x08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000f434f554e5445525f544f4f5f4c4f570000000000000000000000000000000000",
+		},
+	}
+
+	for _, tc := range testCases {
+		errWithReason := types.NewExecErrorWithReason(tc.revertReason)
+		require.Equal(t, tc.errorMessage, errWithReason.Error())
+		require.Equal(t, tc.data, errWithReason.ErrorData())
+		require.Equal(t, 3, errWithReason.ErrorCode())
+	}
+}