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eth: fix a rare datarace on CHT challenge reply / shutdown #25831

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Merged
merged 1 commit into from
Sep 20, 2022
Merged

eth: fix a rare datarace on CHT challenge reply / shutdown #25831

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18 changes: 14 additions & 4 deletions eth/handler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -391,11 +391,16 @@ func (h *handler) runEthPeer(peer *eth.Peer, handler eth.Handler) error {
if h.checkpointHash != (common.Hash{}) {
// Request the peer's checkpoint header for chain height/weight validation
resCh := make(chan *eth.Response)
if _, err := peer.RequestHeadersByNumber(h.checkpointNumber, 1, 0, false, resCh); err != nil {

req, err := peer.RequestHeadersByNumber(h.checkpointNumber, 1, 0, false, resCh)
if err != nil {
return err
}
// Start a timer to disconnect if the peer doesn't reply in time
go func() {
// Ensure the request gets cancelled in case of error/drop
defer req.Close()

timeout := time.NewTimer(syncChallengeTimeout)
defer timeout.Stop()

Expand Down Expand Up @@ -437,10 +442,15 @@ func (h *handler) runEthPeer(peer *eth.Peer, handler eth.Handler) error {
// If we have any explicit peer required block hashes, request them
for number, hash := range h.requiredBlocks {
resCh := make(chan *eth.Response)
if _, err := peer.RequestHeadersByNumber(number, 1, 0, false, resCh); err != nil {

req, err := peer.RequestHeadersByNumber(number, 1, 0, false, resCh)
if err != nil {
return err
}
go func(number uint64, hash common.Hash) {
go func(number uint64, hash common.Hash, req *eth.Request) {
// Ensure the request gets cancelled in case of error/drop
defer req.Close()

timeout := time.NewTimer(syncChallengeTimeout)
defer timeout.Stop()

Expand Down Expand Up @@ -469,7 +479,7 @@ func (h *handler) runEthPeer(peer *eth.Peer, handler eth.Handler) error {
peer.Log().Warn("Required block challenge timed out, dropping", "addr", peer.RemoteAddr(), "type", peer.Name())
h.removePeer(peer.ID())
}
}(number, hash)
}(number, hash, req)
}
// Handle incoming messages until the connection is torn down
return handler(peer)
Expand Down