From 4a242edc1f17f0abb46b6bd0b2600ceab6a7f538 Mon Sep 17 00:00:00 2001 From: Michael Schmoock Date: Wed, 29 May 2019 12:51:58 +0200 Subject: [PATCH] test: drains a channel to crash the daemon --- tests/test_gossip.py | 94 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 93 insertions(+), 1 deletion(-) diff --git a/tests/test_gossip.py b/tests/test_gossip.py index 867a44693..471395001 100644 --- a/tests/test_gossip.py +++ b/tests/test_gossip.py @@ -1,5 +1,5 @@ from fixtures import * # noqa: F401,F403 -from lightning import RpcError +from lightning import RpcError, Millisatoshi from utils import wait_for, TIMEOUT, only_one import json @@ -1153,3 +1153,95 @@ def test_gossip_store_compact(node_factory, bitcoind): # Should restart ok. l2.restart() wait_for(lambda: l2.daemon.is_in_log('gossip_store: Read ')) + + +@pytest.mark.xfail(strict=True) +def test_channel_drainage(node_factory, bitcoind): + """Test channel drainage. + + Test to drains a channels as much as possible, + especially in regards to commitment fee: + + [l1] <=> [l2] + """ + sats = 10**6 + l1, l2 = node_factory.line_graph(2, fundamount=sats, wait_for_announce=True) + + # wait for everyone to see every channel as active + for n in [l1, l2]: + wait_for(lambda: [c['active'] for c in n.rpc.listchannels()['channels']] == [True] * 2 * 1) + + spendable_l1 = l1.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + spendable_l2 = l2.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + + # so spendable is total capacity minus reserves + amount = spendable_l1 + # the next substraction is up to the millisatoshi the _exact_ value + # we need to make getroute find a route without fuzz. why is that? + amount -= Millisatoshi("10009800msat") + # the next substraction is to get around "WIRE_TEMPORARY_CHANNEL_FAILURE: Capacity exceeded" + # caused by the HTLC commitment fees at l1 + amount -= Millisatoshi("3431sat") + + payment_hash = l2.rpc.invoice('any', 'inv', 'for testing')['payment_hash'] + route = l1.rpc.getroute(l2.info['id'], amount, riskfactor=1, fuzzpercent=0)['route'] + fees = route[0]['amount_msat'] - amount + print("spendable:%s amount:%s fees:%s" % (spendable_l1, amount, fees)) + result = l1.rpc.sendpay(route, payment_hash) + print("sendpay", result) + result = l1.rpc.waitsendpay(payment_hash, 10) + print("waitsendpay", result) + + # wait until spendable is updated for both nodes + spendable_l1_bak = spendable_l1 + spendable_l2_bak = spendable_l2 + while spendable_l1_bak == spendable_l1 or spendable_l2_bak == spendable_l2: + spendable_l1 = l1.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + spendable_l2 = l2.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + + # now we drain twice to try to get into invalid channel state + # NOTE: draining twice is possible because the required commitment + # fees are less when there little in the channel. dunno why. + print("spendable after first drain", spendable_l1) # 13440800msat + amount = spendable_l1 + # now we substract again as much as needed to get around "Capacity exceeded" + amount -= Millisatoshi("10860sat") + payment_hash = l2.rpc.invoice('any', 'inv2', 'for testing')['payment_hash'] + route = l1.rpc.getroute(l2.info['id'], amount, riskfactor=1, fuzzpercent=0)['route'] + fees = route[0]['amount_msat'] - amount + print("spendable:%s amount:%s fees:%s" % (spendable_l1, amount, fees)) + result = l1.rpc.sendpay(route, payment_hash) + print("sendpay", result) + result = l1.rpc.waitsendpay(payment_hash, 10) + print("waitsendpay", result) + # wait again until spendable is updated for both nodes + spendable_l1_bak = spendable_l1 + spendable_l2_bak = spendable_l2 + while spendable_l1_bak == spendable_l1 or spendable_l2_bak == spendable_l2: + spendable_l1 = l1.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + spendable_l2 = l2.rpc.listpeers()['peers'][0]['channels'][0]['spendable_msat'] + + # in the broken state the next bigger payment from l2 to l1 will crash the daemon at l2. + # Note1: A smaller payment (i.e. 10000sat) unlocks this state and recovers. + # Note2: When the remote is LND the payment will cracefully fail until the + # broken state is unlocked and recovered with a small initial payment. + """ +lightning_channeld: channeld/channeld.c:1382: handle_peer_commit_sig: Assertion `can_funder_afford_feerate(peer->channel, peer->channel->view[LOCAL] .feerate_per_kw)' failed. +FATAL SIGNAL 6 (version v0.7.0-397-gd803275)' +backtrace: common/daemon.c:45 (send_backtrace) 0x562b824fa13f' +backtrace: common/daemon.c:53 (crashdump) 0x562b824fa18f' +backtrace: (null):0 ((null)) 0x7f1028c3c8af' +backtrace: (null):0 ((null)) 0x7f1028c3c82f' +backtrace: (null):0 ((null)) 0x7f1028c27671' +backtrace: (null):0 ((null)) 0x7f1028c27547' +backtrace: (null):0 ((null)) 0x7f1028c34db5' +backtrace: channeld/channeld.c:1380 (handle_peer_commit_sig) 0x562b824e984d' +backtrace: channeld/channeld.c:1819 (peer_in) 0x562b824eadcd' +backtrace: channeld/channeld.c:3102 (main) 0x562b824ee14b' +backtrace: (null):0 ((null)) 0x7f1028c28ce2' +backtrace: (null):0 ((null)) 0x562b824e57fd' +backtrace: (null):0 ((null)) 0xffffffffffffffff' +lightning_channeld: FATAL SIGNAL 6 (version v0.7.0-397-gd803275) + """ + bolt11 = l1.rpc.invoice('100000sat', 'inv', 'for testing')['bolt11'] + result = l2.rpc.pay(bolt11)