core: fix race conditions in txpool (#23474)

* core: fix race conditions in txpool

* core: fixed races in the txpool

* core: rebased on master

* core: move reheap mutex

* core: renamed mutex

* core: revert Reheap changes

core/tx_pool.go

@@ -22,6 +22,7 @@ import (
 	"math/big"
 	"sort"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -264,6 +265,7 @@ type TxPool struct {
 	reorgDoneCh     chan chan struct{}
 	reorgShutdownCh chan struct{}  // requests shutdown of scheduleReorgLoop
 	wg              sync.WaitGroup // tracks loop, scheduleReorgLoop
+	initDoneCh      chan struct{}  // is closed once the pool is initialized (for tests)
 
 	changesSinceReorg int // A counter for how many drops we've performed in-between reorg.
 }
@@ -294,6 +296,7 @@ func NewTxPool(config TxPoolConfig, chainconfig *params.ChainConfig, chain block
 		queueTxEventCh:  make(chan *types.Transaction),
 		reorgDoneCh:     make(chan chan struct{}),
 		reorgShutdownCh: make(chan struct{}),
+		initDoneCh:      make(chan struct{}),
 		gasPrice:        new(big.Int).SetUint64(config.PriceLimit),
 	}
 	pool.locals = newAccountSet(pool.signer)
@@ -347,6 +350,8 @@ func (pool *TxPool) loop() {
 	defer evict.Stop()
 	defer journal.Stop()
 
+	// Notify tests that the init phase is done
+	close(pool.initDoneCh)
 	for {
 		select {
 		// Handle ChainHeadEvent
@@ -365,8 +370,8 @@ func (pool *TxPool) loop() {
 		case <-report.C:
 			pool.mu.RLock()
 			pending, queued := pool.stats()
-			stales := pool.priced.stales
 			pool.mu.RUnlock()
+			stales := int(atomic.LoadInt64(&pool.priced.stales))
 
 			if pending != prevPending || queued != prevQueued || stales != prevStales {
 				log.Debug("Transaction pool status report", "executable", pending, "queued", queued, "stales", stales)