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tests/fuzzers: fix goroutine leak in les fuzzer (#22455)

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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.
This commit is contained in:
Martin Holst Swende 2021-03-16 09:43:33 +01:00 committed by GitHub
parent faacc8e0fa
commit bc47993692
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 11 additions and 7 deletions
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4
les/server_requests.go
View File

@ -206,8 +206,8 @@ func handleGetBlockHeaders(msg Decoder) (serveRequestFn, uint64, uint64, error)
next = current + r.Query.Skip + 1
)
if next <= current {
infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", r.Query.Skip, "next", next, "attacker", infos)
infos, _ := json.Marshal(p.Peer.Info())
p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", r.Query.Skip, "next", next, "attacker", string(infos))
unknown = true
} else {
if header := bc.GetHeaderByNumber(next); header != nil {

8
les/test_helper.go
View File

@ -661,6 +661,10 @@ func newClientServerEnv(t *testing.T, config testnetConfig) (*testServer, *testC
return s, c, teardown
}
func NewFuzzerPeer(version int) *clientPeer {
return newClientPeer(version, 0, p2p.NewPeer(enode.ID{}, "", nil), nil)
// NewFuzzerPeer creates a client peer for test purposes, and also returns
// a function to close the peer: this is needed to avoid goroutine leaks in the
// exec queue.
func NewFuzzerPeer(version int) (p *clientPeer, closer func()) {
p = newClientPeer(version, 0, p2p.NewPeer(enode.ID{}, "", nil), nil)
return p, func() { p.peerCommons.close() }
}

6
tests/fuzzers/les/les-fuzzer.go
View File

@ -261,18 +261,18 @@ func (d dummyMsg) Decode(val interface{}) error {
}
func (f *fuzzer) doFuzz(msgCode uint64, packet interface{}) {
version := f.randomInt(3) + 2 // [LES2, LES3, LES4]
peer := l.NewFuzzerPeer(version)
enc, err := rlp.EncodeToBytes(packet)
if err != nil {
panic(err)
}
version := f.randomInt(3) + 2 // [LES2, LES3, LES4]
peer, closeFn := l.NewFuzzerPeer(version)
defer closeFn()
fn, _, _, err := l.Les3[msgCode].Handle(dummyMsg{enc})
if err != nil {
panic(err)
}
fn(f, peer, func() bool { return true })
}
func Fuzz(input []byte) int {