diff --git a/eth/tracers/api.go b/eth/tracers/api.go
index 9327f29ee9..0add06c8f6 100644
--- a/eth/tracers/api.go
+++ b/eth/tracers/api.go
@@ -654,6 +654,10 @@ func (api *API) traceBlockParallel(ctx context.Context, block *types.Block, stat
 					TxIndex:     task.index,
 					TxHash:      txs[task.index].Hash(),
 				}
+				// Reconstruct the block context for each transaction
+				// as the GetHash function of BlockContext is not safe for
+				// concurrent use.
+				// See: https://github.com/ethereum/go-ethereum/issues/29114
 				blockCtx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
 				res, err := api.traceTx(ctx, msg, txctx, blockCtx, task.statedb, config)
 				if err != nil {