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eth/protocols/snap: check the pivot is canonical in isPivotCommitted

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This commit is contained in:
jonny rhea 2026-07-15 16:21:30 -05:00
parent 44315b711b
commit 62bbe63cb7
2 changed files with 20 additions and 7 deletions
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5
eth/protocols/snap/syncv2.go
View file

@ -817,6 +817,11 @@ func catchUpExceedsRetention(prev, curr *types.Header) bool {
// pivot. That only happens when a completed sync committed the pivot block
// as the new chain head.
func isPivotCommitted(db ethdb.Database, pivot *types.Header) bool {
// A reorg across the pivot means the committed sync was undone, not
// advanced past, so the pivot must still be canonical.
if rawdb.ReadCanonicalHash(db, pivot.Number.Uint64()) != pivot.Hash() {
return false
}
head := rawdb.ReadHeadBlockHash(db)
if head == (common.Hash{}) {
return false

22
eth/protocols/snap/syncv2_test.go
View file

@ -1387,23 +1387,31 @@ func TestIsPivotCommitted(t *testing.T) {
tests := []struct {
head int64 // head block number, -1 for no head block at all
pivot uint64
canonical bool // pivot still canonical at its height
committed bool
}{
{-1, 100, false}, // no head block, nothing committed
{50, 100, false}, // head behind the pivot, crash before the commit
{100, 100, true}, // head at the pivot, the commit just happened
{103, 100, true}, // head past the pivot, full sync ran after
{0, 0, false}, // genesis head is just an empty chain
{-1, 100, true, false}, // no head block, nothing committed
{50, 100, true, false}, // head behind the pivot, crash before the commit
{100, 100, true, true}, // head at the pivot, the commit just happened
{103, 100, true, true}, // head past the pivot, full sync ran after
{0, 0, true, false}, // genesis head is just an empty chain
{103, 100, false, false}, // pivot reorged out, head past it on a fork
}
for _, tt := range tests {
db := rawdb.NewMemoryDatabase()
pivot := mkPivot(tt.pivot, common.HexToHash("0xaaaa"))
if tt.canonical {
rawdb.WriteCanonicalHash(db, pivot.Hash(), tt.pivot)
} else {
rawdb.WriteCanonicalHash(db, common.HexToHash("0xdead"), tt.pivot)
}
if tt.head >= 0 {
head := mkPivot(uint64(tt.head), common.HexToHash("0xbbbb"))
rawdb.WriteHeader(db, head)
rawdb.WriteHeadBlockHash(db, head.Hash())
}
if have := isPivotCommitted(db, mkPivot(tt.pivot, common.HexToHash("0xaaaa"))); have != tt.committed {
t.Errorf("head %d pivot %d: isPivotCommitted = %v, want %v", tt.head, tt.pivot, have, tt.committed)
if have := isPivotCommitted(db, pivot); have != tt.committed {
t.Errorf("head %d pivot %d canonical %v: isPivotCommitted = %v, want %v", tt.head, tt.pivot, tt.canonical, have, tt.committed)
}
}
}