fix: deadlock when add bundle into bundlepool (#46)

core/txpool/bundlepool/bundlepool.go

@@ -125,14 +125,15 @@ func (p *BundlePool) AddBundle(bundle *types.Bundle) error {
 	if err != nil {
 		return err
 	}
+
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if price.Cmp(p.minimalBundleGasPrice()) < 0 && p.slots+numSlots(bundle) > p.config.GlobalSlots {
 		return ErrBundleGasPriceLow
 	}
 	bundle.Price = price
 
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
 	hash := bundle.Hash()
 	if _, ok := p.bundles[hash]; ok {
 		return ErrBundleAlreadyExist
@@ -326,8 +327,6 @@ func (p *BundlePool) deleteBundle(hash common.Hash) {
 
 // drop removes the bundle with the lowest gas price from the pool.
 func (p *BundlePool) drop() {
-	p.mu.Lock()
-	defer p.mu.Unlock()
 	for len(p.bundleHeap) > 0 {
 		// Pop the bundle with the lowest gas price
 		// the min element in the heap may not exist in the pool as it may be pruned