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Fixing race condition identified by TSAN when reading status.winner which is now directly read within election::confirmed as of https://github.com/nanocurrency/nano-node/pull/4200 (#4218)

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clemahieu 2023-04-24 16:49:33 +01:00 • committed by GitHub
commit a3026afca1
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2 changed files with 14 additions and 7 deletions
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18
nano/node/election.cpp
View file

@ -124,6 +124,11 @@ bool nano::election::state_change (nano::election::state_t expected_a, nano::ele
return result;
}
bool nano::election::confirmed (nano::unique_lock<nano::mutex> & lock) const
{
return node.block_confirmed (status.winner->hash ());
}
std::chrono::milliseconds nano::election::confirm_req_time () const
{
switch (behavior ())
@ -158,7 +163,8 @@ void nano::election::transition_active ()
bool nano::election::confirmed () const
{
return node.block_confirmed (status.winner->hash ());
nano::unique_lock<nano::mutex> lock{ mutex };
return confirmed (lock);
}
bool nano::election::status_confirmed () const
@ -188,7 +194,7 @@ void nano::election::broadcast_vote ()
nano::unique_lock<nano::mutex> lock{ mutex };
if (last_vote + std::chrono::milliseconds (node.config.network_params.network.vote_broadcast_interval) < std::chrono::steady_clock::now ())
{
broadcast_vote_impl ();
broadcast_vote_impl (lock);
last_vote = std::chrono::steady_clock::now ();
}
}
@ -436,7 +442,7 @@ nano::election_vote_result nano::election::vote (nano::account const & rep, uint
node.stats.inc (nano::stat::type::election, vote_source_a == vote_source::live ? nano::stat::detail::vote_new : nano::stat::detail::vote_cached);
if (!confirmed ())
if (!confirmed (lock))
{
confirm_if_quorum (lock);
}
@ -448,7 +454,7 @@ bool nano::election::publish (std::shared_ptr<nano::block> const & block_a)
nano::unique_lock<nano::mutex> lock{ mutex };
// Do not insert new blocks if already confirmed
auto result (confirmed ());
auto result = confirmed (lock);
if (!result && last_blocks.size () >= max_blocks && last_blocks.find (block_a->hash ()) == last_blocks.end ())
{
if (!replace_by_weight (lock, block_a->hash ()))
@ -501,7 +507,7 @@ std::shared_ptr<nano::block> nano::election::winner () const
return status.winner;
}
void nano::election::broadcast_vote_impl ()
void nano::election::broadcast_vote_impl (nano::unique_lock<nano::mutex> & lock)
{
debug_assert (!mutex.try_lock ());
@ -509,7 +515,7 @@ void nano::election::broadcast_vote_impl ()
{
node.stats.inc (nano::stat::type::election, nano::stat::detail::generate_vote);
if (confirmed () || have_quorum (tally_impl ()))
if (confirmed (lock) || have_quorum (tally_impl ()))
{
node.stats.inc (nano::stat::type::election, nano::stat::detail::generate_vote_final);
node.final_generator.add (root, status.winner->hash ()); // Broadcasts vote to the network

3
nano/node/election.hpp
View file

@ -110,6 +110,7 @@ private: // State management
bool valid_change (nano::election::state_t, nano::election::state_t) const;
bool state_change (nano::election::state_t, nano::election::state_t);
bool confirmed (nano::unique_lock<nano::mutex> & lock) const;
public: // State transitions
bool transition_time (nano::confirmation_solicitor &);
@ -174,7 +175,7 @@ private:
* Broadcast vote for current election winner. Generates final vote if reached quorum or already confirmed
* Requires mutex lock
*/
void broadcast_vote_impl ();
void broadcast_vote_impl (nano::unique_lock<nano::mutex> & lock);
void remove_votes (nano::block_hash const &);
void remove_block (nano::block_hash const &);
bool replace_by_weight (nano::unique_lock<nano::mutex> & lock_a, nano::block_hash const &);