More error detail

src/consensus/base.rs

@@ -213,14 +213,22 @@ impl ConsensusEngineBase {
             return Err(ValidationError::DuplicateOmmer.into());
         }
 
-        let parent = state
-            .read_parent_header(&block.header)?
-            .ok_or(ValidationError::UnknownParent)?;
+        let parent =
+            state
+                .read_parent_header(&block.header)?
+                .ok_or(ValidationError::UnknownParent {
+                    number: block.header.number,
+                    parent_hash: block.header.parent_hash,
+                })?;
 
         for ommer in &block.ommers {
-            let ommer_parent = state
-                .read_parent_header(ommer)?
-                .ok_or(ValidationError::UnknownParent)?;
+            let ommer_parent =
+                state
+                    .read_parent_header(ommer)?
+                    .ok_or(ValidationError::OmmerUnknownParent {
+                        number: ommer.number,
+                        parent_hash: ommer.parent_hash,
+                    })?;
 
             self.validate_block_header(ommer, &ommer_parent, false)
                 .context(ValidationError::InvalidOmmerHeader)?;

src/consensus/blockchain.rs

@@ -265,7 +265,10 @@ impl<'state> Blockchain<'state> {
         let parent = self
             .state
             .read_header(BlockNumber(header.number.0 - 1), header.parent_hash)?
-            .ok_or(ValidationError::UnknownParent)?;
+            .ok_or(ValidationError::UnknownParent {
+                number: header.number,
+                parent_hash: header.parent_hash,
+            })?;
         self.canonical_ancestor(&parent.into(), header.parent_hash)
     }
 }

src/consensus/mod.rs

@@ -103,7 +103,10 @@ pub enum ValidationError {
     }, // wrong Hb
 
     // See [YP] Section 4.3.4 "Block Header Validity", Eq (50)
-    UnknownParent,   // P(H) = ∅ ∨ Hi ≠ P(H)Hi + 1
+    UnknownParent {
+        number: BlockNumber,
+        parent_hash: H256,
+    }, // P(H) = ∅ ∨ Hi ≠ P(H)Hi + 1
     WrongDifficulty, // Hd ≠ D(H)
     GasAboveLimit {
         used: u64,
@@ -133,6 +136,10 @@ pub enum ValidationError {
     MaxPriorityFeeGreaterThanMax, // max_priority_fee_per_gas > max_fee_per_gas (EIP-1559)
 
     // See [YP] Section 11.1 "Ommer Validation", Eq (157)
+    OmmerUnknownParent {
+        number: BlockNumber,
+        parent_hash: H256,
+    }, // P(H) = ∅ ∨ Hi ≠ P(H)Hi + 1
     TooManyOmmers,      // ‖BU‖ > 2
     InvalidOmmerHeader, // ¬V(U)
     NotAnOmmer,         // ¬k(U, P(BH)H, 6)