core : fix quit channel goroutine leak

core/blockchain.go

@@ -215,7 +215,7 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 		db:             db,
 		triegc:         prque.New(nil),
 		stateCache:     state.NewDatabaseWithCache(db, cacheConfig.TrieCleanLimit),
-		quit:           make(chan struct{}),
+		quit:           make(chan struct{}, 1),
 		shouldPreserve: shouldPreserve,
 		bodyCache:      bodyCache,
 		bodyRLPCache:   bodyRLPCache,

core/bloombits/matcher.go

@@ -154,8 +154,8 @@ func (m *Matcher) Start(ctx context.Context, begin, end uint64, results chan uin
 	// Initiate a new matching round
 	session := &MatcherSession{
 		matcher: m,
-		quit:    make(chan struct{}),
-		kill:    make(chan struct{}),
+		quit:    make(chan struct{}, 1),
+		kill:    make(chan struct{}, 1),
 		ctx:     ctx,
 	}
 	for _, scheduler := range m.schedulers {

core/rawdb/freezer_reinit.go

@@ -44,7 +44,7 @@ func InitDatabaseFromFreezer(db ethdb.Database) error {
 		number  = ^uint64(0) // -1
 		results = make(chan *types.Block, 4*runtime.NumCPU())
 	)
-	abort := make(chan struct{})
+	abort := make(chan struct{}, 1)
 	defer close(abort)
 
 	for i := 0; i < runtime.NumCPU(); i++ {