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Merge pull request #7460

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2935a0c async_protocol_handler_config: fix deadlock (anon)
c877705 async_protocol_handler_config: add deadlock demo (anon)
This commit is contained in:
luigi1111 2021-03-29 21:46:29 -04:00
commit a2b046dafc
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2 changed files with 134 additions and 28 deletions
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52
contrib/epee/include/net/levin_protocol_handler_async.h
View File

@ -769,36 +769,32 @@ void async_protocol_handler_config<t_connection_context>::del_connection(async_p
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::delete_connections(size_t count, bool incoming)
{
std::vector <boost::uuids::uuid> connections;
std::vector<typename connections_map::mapped_type> connections;
auto scope_exit_handler = misc_utils::create_scope_leave_handler([&connections]{
for (auto &aph: connections)
aph->finish_outer_call();
});
CRITICAL_REGION_BEGIN(m_connects_lock);
for (auto& c: m_connects)
{
if (c.second->m_connection_context.m_is_income == incoming)
connections.push_back(c.first);
if (c.second->start_outer_call())
connections.push_back(c.second);
}
// close random connections from the provided set
// TODO or better just keep removing random elements (performance)
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
shuffle(connections.begin(), connections.end(), std::default_random_engine(seed));
while (count > 0 && connections.size() > 0)
{
try
{
auto i = connections.end() - 1;
async_protocol_handler<t_connection_context> *conn = m_connects.at(*i);
m_connects.erase(*i);
conn->close();
connections.erase(i);
}
catch (const std::out_of_range &e)
{
MWARNING("Connection not found in m_connects, continuing");
}
--count;
}
for (size_t i = 0; i < connections.size() && i < count; ++i)
m_connects.erase(connections[i]->get_connection_id());
CRITICAL_REGION_END();
for (size_t i = 0; i < connections.size() && i < count; ++i)
connections[i]->close();
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
@ -860,18 +856,19 @@ int async_protocol_handler_config<t_connection_context>::invoke_async(int comman
template<class t_connection_context> template<class callback_t>
bool async_protocol_handler_config<t_connection_context>::foreach_connection(const callback_t &cb)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
std::vector<typename connections_map::mapped_type> conn;
conn.reserve(m_connects.size());
auto scope_exit_handler = misc_utils::create_scope_leave_handler([&conn]{
for (auto &aph: conn)
aph->finish_outer_call();
});
CRITICAL_REGION_BEGIN(m_connects_lock);
conn.reserve(m_connects.size());
for (auto &e: m_connects)
if (e.second->start_outer_call())
conn.push_back(e.second);
CRITICAL_REGION_END()
for (auto &aph: conn)
if (!cb(aph->get_context_ref()))
@ -883,11 +880,8 @@ bool async_protocol_handler_config<t_connection_context>::foreach_connection(con
template<class t_connection_context> template<class callback_t>
bool async_protocol_handler_config<t_connection_context>::for_connection(const boost::uuids::uuid &connection_id, const callback_t &cb)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
async_protocol_handler<t_connection_context>* aph = find_connection(connection_id);
if (!aph)
return false;
if (!aph->start_outer_call())
async_protocol_handler<t_connection_context>* aph = nullptr;
if (find_and_lock_connection(connection_id, aph) != LEVIN_OK)
return false;
auto scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler<t_connection_context>::finish_outer_call, aph));
@ -953,12 +947,14 @@ int async_protocol_handler_config<t_connection_context>::send(byte_slice message
template<class t_connection_context>
bool async_protocol_handler_config<t_connection_context>::close(boost::uuids::uuid connection_id)
{
CRITICAL_REGION_LOCAL(m_connects_lock);
async_protocol_handler<t_connection_context>* aph = find_connection(connection_id);
if (!aph)
async_protocol_handler<t_connection_context>* aph = nullptr;
if (find_and_lock_connection(connection_id, aph) != LEVIN_OK)
return false;
auto scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler<t_connection_context>::finish_outer_call, aph));
if (!aph->close())
return false;
CRITICAL_REGION_LOCAL(m_connects_lock);
m_connects.erase(connection_id);
return true;
}

110
tests/unit_tests/epee_boosted_tcp_server.cpp
View File

@ -170,6 +170,7 @@ TEST(test_epee_connection, test_lifetime)
using connection_ptr = boost::shared_ptr<connection_t>;
using shared_state_t = typename connection_t::shared_state;
using shared_state_ptr = std::shared_ptr<shared_state_t>;
using shared_states_t = std::vector<shared_state_ptr>;
using tag_t = boost::uuids::uuid;
using tags_t = std::vector<tag_t>;
using io_context_t = boost::asio::io_service;
@ -344,6 +345,115 @@ TEST(test_epee_connection, test_lifetime)
shared_state->del_out_connections(1);
ASSERT_TRUE(shared_state->get_connections_count() == 0);
}
shared_states_t shared_states;
while (shared_states.size() < 2) {
shared_states.emplace_back(std::make_shared<shared_state_t>());
shared_states.back()->set_handler(new command_handler_t(ZERO_DELAY,
[&shared_states]{
for (auto &s: shared_states) {
auto success = s->foreach_connection([](context_t&){
return true;
});
ASSERT_TRUE(success);
}
}
),
&command_handler_t::destroy
);
}
workers_t workers;
for (auto &s: shared_states) {
workers.emplace_back([&io_context, &s, &endpoint]{
for (auto i = 0; i < N * N; ++i) {
connection_ptr conn(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
io_context.post([conn]{
conn->cancel();
});
conn.reset();
s->del_out_connections(1);
while (s->sock_count);
}
});
}
for (;workers.size(); workers.pop_back())
workers.back().join();
for (auto &s: shared_states) {
workers.emplace_back([&io_context, &s, &endpoint]{
for (auto i = 0; i < N * N; ++i) {
connection_ptr conn(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
conn->cancel();
while (conn.use_count() > 1);
s->foreach_connection([&io_context, &s, &endpoint, &conn](context_t& context){
conn.reset(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
conn->cancel();
while (conn.use_count() > 1);
conn.reset();
return true;
});
while (s->sock_count);
}
});
}
for (;workers.size(); workers.pop_back())
workers.back().join();
for (auto &s: shared_states) {
workers.emplace_back([&io_context, &s, &endpoint]{
for (auto i = 0; i < N; ++i) {
connection_ptr conn(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
context_t context;
conn->get_context(context);
auto tag = context.m_connection_id;
conn->cancel();
while (conn.use_count() > 1);
s->for_connection(tag, [&io_context, &s, &endpoint, &conn](context_t& context){
conn.reset(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
conn->cancel();
while (conn.use_count() > 1);
conn.reset();
return true;
});
while (s->sock_count);
}
});
}
for (;workers.size(); workers.pop_back())
workers.back().join();
for (auto &s: shared_states) {
workers.emplace_back([&io_context, &s, &endpoint]{
for (auto i = 0; i < N; ++i) {
connection_ptr conn(new connection_t(io_context, s, {}, {}));
conn->socket().connect(endpoint);
conn->start({}, {});
context_t context;
conn->get_context(context);
auto tag = context.m_connection_id;
io_context.post([conn]{
conn->cancel();
});
conn.reset();
s->close(tag);
while (s->sock_count);
}
});
}
for (;workers.size(); workers.pop_back())
workers.back().join();
});
for (auto& w: workers) {