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Merge pull request #17357 from karalabe/tracer-trie-deref-bug

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eth, trie: fix tracer GC which accidentally pruned the metaroot
This commit is contained in:
Péter Szilágyi 2018-08-09 12:35:12 +03:00 committed by GitHub
commit beade042d1
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2 changed files with 11 additions and 2 deletions
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4
eth/api_tracer.go
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@ -297,7 +297,9 @@ func (api *PrivateDebugAPI) traceChain(ctx context.Context, start, end *types.Bl
database.TrieDB().Reference(root, common.Hash{})
}
// Dereference all past tries we ourselves are done working with
if proot != (common.Hash{}) {
database.TrieDB().Dereference(proot)
}
proot = root
// TODO(karalabe): Do we need the preimages? Won't they accumulate too much?
@ -526,7 +528,9 @@ func (api *PrivateDebugAPI) computeStateDB(block *types.Block, reexec uint64) (*
return nil, err
}
database.TrieDB().Reference(root, common.Hash{})
if proot != (common.Hash{}) {
database.TrieDB().Dereference(proot)
}
proot = root
}
nodes, imgs := database.TrieDB().Size()

5
trie/database.go
View File

@ -431,6 +431,11 @@ func (db *Database) reference(child common.Hash, parent common.Hash) {
// Dereference removes an existing reference from a root node.
func (db *Database) Dereference(root common.Hash) {
// Sanity check to ensure that the meta-root is not removed
if root == (common.Hash{}) {
log.Error("Attempted to dereference the trie cache meta root")
return
}
db.lock.Lock()
defer db.lock.Unlock()