tests/fuzzers: fix goroutine leak in les fuzzer (#22455)
The oss-fuzz fuzzer has been reporting some failing testcases for les. They're all spurious, and cannot reliably be reproduced. However, running them showed that there was a goroutine leak: the tests created a lot of new clients, which started an exec queue that was never torn down. This PR fixes the goroutine leak, and also a log message which was erroneously formatted.
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@ -206,8 +206,8 @@ func handleGetBlockHeaders(msg Decoder) (serveRequestFn, uint64, uint64, error)
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next = current + r.Query.Skip + 1
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)
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if next <= current {
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infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
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p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", r.Query.Skip, "next", next, "attacker", infos)
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infos, _ := json.Marshal(p.Peer.Info())
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p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", r.Query.Skip, "next", next, "attacker", string(infos))
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unknown = true
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} else {
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if header := bc.GetHeaderByNumber(next); header != nil {
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@ -661,6 +661,10 @@ func newClientServerEnv(t *testing.T, config testnetConfig) (*testServer, *testC
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return s, c, teardown
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}
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func NewFuzzerPeer(version int) *clientPeer {
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return newClientPeer(version, 0, p2p.NewPeer(enode.ID{}, "", nil), nil)
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// NewFuzzerPeer creates a client peer for test purposes, and also returns
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// a function to close the peer: this is needed to avoid goroutine leaks in the
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// exec queue.
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func NewFuzzerPeer(version int) (p *clientPeer, closer func()) {
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p = newClientPeer(version, 0, p2p.NewPeer(enode.ID{}, "", nil), nil)
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return p, func() { p.peerCommons.close() }
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}
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@ -261,18 +261,18 @@ func (d dummyMsg) Decode(val interface{}) error {
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}
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func (f *fuzzer) doFuzz(msgCode uint64, packet interface{}) {
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version := f.randomInt(3) + 2 // [LES2, LES3, LES4]
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peer := l.NewFuzzerPeer(version)
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enc, err := rlp.EncodeToBytes(packet)
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if err != nil {
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panic(err)
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}
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version := f.randomInt(3) + 2 // [LES2, LES3, LES4]
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peer, closeFn := l.NewFuzzerPeer(version)
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defer closeFn()
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fn, _, _, err := l.Les3[msgCode].Handle(dummyMsg{enc})
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if err != nil {
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panic(err)
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}
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fn(f, peer, func() bool { return true })
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}
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func Fuzz(input []byte) int {
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