diff --git a/CHANGELOG b/CHANGELOG
index 60f4d26..eb0a749 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,9 +1,9 @@
 proxy更新日志
-v6.7
+v6.8
 1.HTTP(S)\SOCKS5代理,API认证功能,发送给认证接口的参数增加了本地IP,local_ip字段,
  代表用户访问的是本地服务器的哪个IP.
-2.fix #194
-3.fix #134
+2.fix #194 , fix #134 , 代理更稳定.
+3.增加了一波英文文档.
 
 v6.6
 1.优化了limitconn的关闭逻辑,释放更多资源.
diff --git a/VERSION b/VERSION
index 5840475..8004d90 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.7
\ No newline at end of file
+6.8
\ No newline at end of file
diff --git a/sdk/CHANGELOG b/sdk/CHANGELOG
index ec15bce..ccb7d53 100644
--- a/sdk/CHANGELOG
+++ b/sdk/CHANGELOG
@@ -1,3 +1,4 @@
-v4.8
-1.修复了多个服务同时开启日志,只会输出到最后一个日志文件的bug.  
-2.增加了获取sdk版本的Version()方法.  
+v6.8
+1.sdk增加了调试锁,避免潜在的并发问题.
+2.sdk的Stop方法增加了锁,避免潜在的并发问题.
+3.sdk的Stop方法增加了关闭文件操作.
\ No newline at end of file
diff --git a/sdk/android-ios/sdk.go b/sdk/android-ios/sdk.go
index da6ab44..c0cb16b 100644
--- a/sdk/android-ios/sdk.go
+++ b/sdk/android-ios/sdk.go
@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"runtime/pprof"
 	"strings"
+	"sync"
 
 	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
@@ -34,7 +35,9 @@ var (
 	app *kingpin.Application
 	cpuProfilingFile, memProfilingFile, blockProfilingFile,
 	goroutineProfilingFile, threadcreateProfilingFile *os.File
-	isProfiling bool
+	isProfiling   bool
+	profilingLock = &sync.Mutex{}
+	startStopLock = &sync.Mutex{}
 )
 
 type LogCallback interface {
@@ -475,6 +478,8 @@ func StartWithLog(serviceID, serviceArgsStr string, loggerCallback LogCallback)
 }
 
 func Stop(serviceID string) {
+	startStopLock.Lock()
+	defer startStopLock.Unlock()
 	services.Stop(serviceID)
 }
 
@@ -482,6 +487,8 @@ func Version() string {
 	return SDK_VERSION
 }
 func StartProfiling(storePath string) {
+	profilingLock.Lock()
+	defer profilingLock.Unlock()
 	if !isProfiling {
 		isProfiling = true
 		if storePath == "" {
@@ -496,6 +503,8 @@ func StartProfiling(storePath string) {
 	}
 }
 func StopProfiling() {
+	profilingLock.Lock()
+	defer profilingLock.Unlock()
 	if isProfiling {
 		isProfiling = false
 		pprof.StopCPUProfile()
@@ -507,6 +516,11 @@ func StopProfiling() {
 		block.WriteTo(blockProfilingFile, 1)
 		threadcreate := pprof.Lookup("threadcreate")
 		threadcreate.WriteTo(threadcreateProfilingFile, 1)
+		//close
+		goroutineProfilingFile.Close()
+		memProfilingFile.Close()
+		blockProfilingFile.Close()
+		threadcreateProfilingFile.Close()
 	}
 
 }