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fix: fix base buffer concurrent read/write race #88

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Apr 23, 2024
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7 changes: 4 additions & 3 deletions trie/triedb/pathdb/nodebufferlist.go
Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,7 @@ func newNodeBufferList(
// node retrieves the trie node with given node info.
func (nf *nodebufferlist) node(owner common.Hash, path []byte, hash common.Hash) (node *trienode.Node, err error) {
nf.mux.RLock()
defer nf.mux.RUnlock()
find := func(nc *multiDifflayer) bool {
subset, ok := nc.nodes[owner]
if !ok {
Expand All @@ -141,14 +142,11 @@ func (nf *nodebufferlist) node(owner common.Hash, path []byte, hash common.Hash)
}
nf.traverse(find)
if err != nil {
nf.mux.RUnlock()
return nil, err
}
if node != nil {
nf.mux.RUnlock()
return node, nil
}
nf.mux.RUnlock()

nf.baseMux.RLock()
node, err = nf.base.node(owner, path, hash)
Expand Down Expand Up @@ -602,10 +600,13 @@ func (w *proposedBlockReader) Node(owner common.Hash, path []byte, hash common.H
current = current.next
}

w.nf.baseMux.RLock()
node, err := w.nf.base.node(owner, path, hash)
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if err != nil {
w.nf.baseMux.RUnlock()
return nil, err
}
w.nf.baseMux.RUnlock()
if node != nil {
return node.Blob, nil
}
Expand Down
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