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test native leak
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‎jni/nativeleak/.gitignore‎

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/build

‎jni/nativeleak/build.gradle‎

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plugins {
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id 'com.android.application'
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}
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android {
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compileSdkVersion 30
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buildToolsVersion "30.0.3"
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defaultConfig {
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applicationId "com.baiiu.nativeleak"
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minSdkVersion 16
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targetSdkVersion 30
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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externalNativeBuild {
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cmake {
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path 'src/main/cpp/CMakeLists.txt'
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version "3.6.0"
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}
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}
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.2.0'
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implementation 'com.google.android.material:material:1.3.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
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testImplementation 'junit:junit:4.+'
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androidTestImplementation 'androidx.test.ext:junit:1.1.2'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
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}

‎jni/nativeleak/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎jni/nativeleak/src/androidTest/java/com/baiiu/nativeleak/ExampleInstrumentedTest.java‎

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package com.baiiu.nativeleak;
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import android.content.Context;
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import androidx.test.platform.app.InstrumentationRegistry;
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import androidx.test.ext.junit.runners.AndroidJUnit4;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import static org.junit.Assert.*;
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
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assertEquals("com.baiiu.nativeleak", appContext.getPackageName());
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}
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}

‎jni/nativeleak/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.baiiu.nativeleak">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/Theme.AndroidModule">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎jni/nativeleak/src/main/cpp/CMakeLists.txt‎

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# For more information about using CMake with Android Studio, read the
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# documentation: https://d.android.com/studio/projects/add-native-code.html
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# Sets the minimum version of CMake required to build the native library.
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cmake_minimum_required(VERSION 3.4.1)
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# 添加动态库
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add_library(
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test-lib
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SHARED
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testLeak.cpp
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)
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# 从某路径下找到动态库并命名
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find_library(
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log-lib
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log)
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# 关联动态库
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target_link_libraries(
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test-lib
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${log-lib})

‎jni/nativeleak/src/main/cpp/native-lib.cpp‎

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//
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// Created by baiiu on 2021/5/20.
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//
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‎jni/nativeleak/src/main/cpp/testLeak.cpp‎

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//
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// Created by baiiu on 2021/5/20.
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//
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#include <android/log.h>
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#include <malloc.h>
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#include "jni.h"
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#include "string.h"
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/*
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*
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*
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这段代码：
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char *p = (char *) malloc(sizeof(char) * 1024 * 1024);
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__android_log_print(ANDROID_LOG_DEBUG, "mLogU", "%p has leaked 1M", p);
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每次分配1M，当虚拟内存分配完后，返回指针为null；
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点Home键后，直接崩溃了；
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adb shell cat proc/27581/statm
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363265 25825 17479 5 0 38044 0
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624514 26183 17810 5 0 299292 0
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886658 26352 17953 5 0 561436 0
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1044866 26447 18021 5 0 719644 0
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1044866 26457 18037 5 0 719644 0
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1044866 26460 18037 5 0 719644 0
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通过proc/[pid]/statm查看，当虚拟内存全部分配后，第一列vmSize已经不再变化，因为没有引用该值，索引
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: FATAL EXCEPTION: main
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: Process: com.baiiu.nativeleak, PID: 27435
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Try again
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at java.lang.Thread.nativeCreate(Native Method)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at java.lang.Thread.start(Thread.java:733)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.QueuedWork.getHandler(QueuedWork.java:104)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.QueuedWork.waitToFinish(QueuedWork.java:153)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.ActivityThread.handleStopActivity(ActivityThread.java:4207)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.servertransaction.StopActivityItem.execute(StopActivityItem.java:41)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.os.Looper.loop(Looper.java:193)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6669)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
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05-20 17:16:54.259 27435 27435 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
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char *p = (char *) malloc(sizeof(char) * 1024 * 1024);
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char *s = "hello_world";
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strcpy(p, s);
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__android_log_print(ANDROID_LOG_DEBUG, "mLogU", "%p has leaked 1M", p);
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每次分配1M，当虚拟内存分配完后，返回指针为null；为null时调用strcpy因空指针崩溃
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当修复空指针问题后，按Home键崩溃时候日志和第一种一样
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generic_x86_arm:/ $ cat proc/27850/statm
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363265 25782 17421 5 0 38044 0
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624514 27164 17735 5 0 299292 0
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886786 28203 17741 5 0 561564 0
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05-20 17:46:57.373 27945 27945 F DEBUG : Build fingerprint: 'google/sdk_gphone_x86_arm/generic_x86_arm:9/PSR1.180720.117/5875966:user/release-keys'
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05-20 17:46:57.373 27945 27945 F DEBUG : Revision: '0'
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05-20 17:46:57.373 27945 27945 F DEBUG : ABI: 'x86'
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05-20 17:46:57.373 27945 27945 F DEBUG : pid: 27850, tid: 27850, name: aiiu.nativeleak >>> com.baiiu.nativeleak <<<
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05-20 17:46:57.373 27945 27945 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
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05-20 17:46:57.373 27945 27945 F DEBUG : Cause: null pointer dereference
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05-20 17:46:57.373 27945 27945 F DEBUG : eax 00000000 ebx d9211fdc ecx f349f2a0 edx 00646c72
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05-20 17:46:57.373 27945 27945 F DEBUG : edi 00000000 esi d9210652
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05-20 17:46:57.373 27945 27945 F DEBUG : ebp ff7fc328 esp ff7fc2c4 eip f349f2a7
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05-20 17:46:57.479 27945 27945 F DEBUG :
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05-20 17:46:57.479 27945 27945 F DEBUG : backtrace:
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05-20 17:46:57.479 27945 27945 F DEBUG : #00 pc 0001e2a7 /system/lib/libc.so (strcpy+1591)
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05-20 17:46:57.479 27945 27945 F DEBUG : #01 pc 00000619 /data/app/com.baiiu.nativeleak-wL45YswCp5R9mJtUY58XoQ==/lib/x86/libnative-lib.so (Java_com_baiiu_nativeleak_MainActivity_testLeak+137)
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由此可见虚拟内存使用完了造成的影响很大，无法mallcoc，正常业务无法运行；
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首先应当尽量避免内存泄露，然后看看能否使用64位so，增大虚拟内存寻址空间；
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*/
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extern "C"
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JNIEXPORT void JNICALL
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Java_com_baiiu_nativeleak_MainActivity_testLeak(JNIEnv *env, jobject thiz) {
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char *p = (char *) malloc(sizeof(char) * 1024 * 1024);
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char *s = "hello_world";
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if (p) {
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strcpy(p, s);
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}
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__android_log_print(ANDROID_LOG_DEBUG, "mLogU", "%p has leaked 1M", p);
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}

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