syn request timeout error

[quan8]

Run multiple nodes (15+) nodes. Got the timeout issue on sync. Two errors occur multiple times in the log:

---

time="2018-11-27T10:57:27+11:00" level=error msg="n.requestSync(peerAddr, knownEvents)" Error="read tcp 127.0.0.1:47930->127.0.0.1:12011: i/o timeout" this_id=828847531 z_trace="goroutine 20465 [running]:\ngithub.com/Fantom-foundation/go-lachesis/src/log.(*Hook).Fire(0xc0001a6ea0, 0xc0611e3f80, 0x0, 0x0)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/log/hook.go:97 +0x18f\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.LevelHooks.Fire(0xc0001bdd70, 0x2, 0xc0611e3f80, 0xe0aa055c06af, 0xc004b0aad6)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/hooks.go:28 +0x91\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.(*Entry).fireHooks(0xc0611e3f80)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:223 +0x8c\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.Entry.log(0xc00010d740, 0xc05457bf80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:201 +0xf6\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.(*Entry).Error(0xc0611e3f20, 0xc0590a9d20, 0x1, 0x1)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:277 +0xae\ngithub.com/Fantom-foundation/go-lachesis/src/node.(*Node).pull(0xc04eabc000, 0xc000023830, 0xf, 0x0, 0x0, 0xc000000005, 0xc05e16d500)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/node/node.go:403 +0x2fd\ngithub.com/Fantom-foundation/go-lachesis/src/node.(*Node).gossip(0xc04eabc000, 0xc000023830, 0xf, 0xc04eebcf60, 0xa, 0xc0006f27b0)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/node/node.go:358 +0x49\ngithub.com/Fantom-foundation/go-lachesis/src/node.(*Node).lachesis.func2()\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/node/node.go:211 +0x49\ngithub.com/Fantom-foundation/go-lachesis/src/node.(*nodeState).goFunc.func1(0xc04eabc000, 0xc09e1a91a0)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/node/state.go:53 +0x53\ncreated by github.com/Fantom-foundation/go-lachesis/src/node.(*nodeState).goFunc\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/node/state.go:51 +0x66\n"

---

time="2018-11-27T10:57:29+11:00" level=error msg="Failed to decode incoming command" error="write tcp 127.0.0.1:12015->127.0.0.1:49216: write: broken pipe" z_trace="goroutine 13832 [running]:\ngithub.com/Fantom-foundation/go-lachesis/src/log.(*Hook).Fire(0xc0001a6fc0, 0xc05c2f8fc0, 0x0, 0x0)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/log/hook.go:97 +0x18f\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.LevelHooks.Fire(0xc0003103f0, 0x2, 0xc05c2f8fc0, 0xe0aaa592e6d7, 0xc02db1f68d)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/hooks.go:28 +0x91\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.(*Entry).fireHooks(0xc05c2f8fc0)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:223 +0x8c\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.Entry.log(0xc00010d980, 0xc098711f80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:201 +0xf6\ngithub.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus.(*Entry).Error(0xc05c2f8f00, 0xc098fe5f00, 0x1, 0x1)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/vendor/github.com/sirupsen/logrus/entry.go:277 +0xae\ngithub.com/Fantom-foundation/go-lachesis/src/net.(*NetworkTransport).handleConn(0xc04e875260, 0xc51a00, 0xc0689d4648)\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/net/net_transport.go:336 +0x3ad\ncreated by github.com/Fantom-foundation/go-lachesis/src/net.(*NetworkTransport).listen\n\t/home/qn/work/src/github.com/Fantom-foundation/go-lachesis/src/net/net_transport.go:320 +0x440\n"