FastJNI死锁问题攻关总结

问题现象

  • 复现步骤
    • Android 7.0平台 + W16.49.4/W16.50.4版本
    • monkey测试时低概率出现定屏和Camera2 ANR问题
  • 多次复现后,特征如下
    • 复现概率低
    • adb能响应,除了system_server/Camera2其它进程均正常
    • system_server/Camera2不响应kill -3信号,无法dump java和native堆栈
    • system_server/Camera2的多数线程处于futex_wait状态

分析定位

初步分析

定屏后,system_server进程的log很少: 只有少数几个线程打印log信息。

  • GC线程异常log

    分析多份log,发现GC线程输出异常信息

    A001-02 11:19:31.708   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:22:49.907   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:26:08.106   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:29:26.304   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:32:44.502   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:36:02.701   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:39:20.899   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:42:39.098   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:45:57.296   731   741 E art     : Unexpected time out during suspend all.
    A001-02 11:49:15.494   731   741 E art     : Unexpected time out during suspend all.
    
  • Debuggerd native堆栈

    "system_server" sysTid=731
     #00 pc 000173e4  /system/lib/libc.so (syscall+28)
     #01 pc 000b69bd  /system/lib/libart.so (_ZN3art17ConditionVariable16WaitHoldingLocksEPNS_6ThreadE+92)
     #02 pc 0027aca3  /system/lib/libart.so (_ZN3art3JNI12NewStringUTFEP7_JNIEnvPKc+214)
     #03 pc 00091ee5  /system/lib/libandroid_runtime.so
     #04 pc 73104e99  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
    
    "Signal Catcher" sysTid=736
     #00 pc 000173e4  /system/lib/libc.so (syscall+28)
     #01 pc 000b69bd  /system/lib/libart.so (_ZN3art17ConditionVariable16WaitHoldingLocksEPNS_6ThreadE+92)
     #02 pc 000f9d6d  /system/lib/libart.so (_ZN3art11ClassLinker14DumpForSigQuitERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+232)
     #03 pc 0031f9eb  /system/lib/libart.so (_ZN3art7Runtime14DumpForSigQuitERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+114)
     #04 pc 0032431b  /system/lib/libart.so (_ZN3art13SignalCatcher13HandleSigQuitEv+1394)
    #05 pc 00323489  /system/lib/libart.so (_ZN3art13SignalCatcher3RunEPv+336)
     #06 pc 00046fd3  /system/lib/libc.so (_ZL15__pthread_startPv+22)
     #07 pc 00019ded  /system/lib/libc.so (__start_thread+6)
    
    "HeapTaskDaemon" sysTid=741
     #00 pc 000173e4  /system/lib/libc.so (syscall+28)
     #01 pc 0033bcc5  /system/lib/libart.so (_ZN3art10ThreadList18SuspendAllInternalEPNS_6ThreadES2_S2_b+496)
     #02 pc 0033c187  /system/lib/libart.so (_ZN3art10ThreadList10SuspendAllEPKcb+374)
     #03 pc 0016eb45  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector11ScopedPauseC2EPS2_+32)
     #04 pc 001737dd  /system/lib/libart.so (_ZN3art2gc9collector9MarkSweep9RunPhasesEv+160)
     #05 pc 0016e555  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector3RunENS0_7GcCauseEb+248)
     #06 pc 00191a6d  /system/lib/libart.so   (_ZN3art2gc4Heap22CollectGarbageInternalENS0_9collector6GcTypeENS0_7GcCauseEb+2364)
     #07 pc 0019734d  /system/lib/libart.so (_ZN3art2gc4Heap12ConcurrentGCEPNS_6ThreadEb+68)
     #08 pc 0019be83  /system/lib/libart.so (_ZN3art2gc4Heap16ConcurrentGCTask3RunEPNS_6ThreadE+18)
     #09 pc 001b4243  /system/lib/libart.so (_ZN3art2gc13TaskProcessor11RunAllTasksEPNS_6ThreadE+30)
     #10 pc 72ce401f  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
     ... ...
    

开会讨论

  • signal catcher为什么不能dump堆栈?

    • signal catcher线程已被GC线程suspend,除非被GC resume,否则无法响应kill -3信号。
  • GC线程suspend机制梳理

    • GC线程先向各线程请求suspend,各线程会在检测到相应标志后主动suspend,GC线程等待其它线程suspend后才去做GC操作。
  • w16.49.4回退提交排查

    • 后期宣告失败,因为早期版本也存在此问题。

添加debug log

  • 尝试分析debuggerd堆栈,排查未suspended线程。但system_server线程个数接近90,排查完后剩余的线程仍然很多。
  • 复现问题时,打印不能被suspend的线程及相关信息

问题复现和分析

ART debug log

A001-01 09:30:03.427   722   733 E art     : Unexpected time out during suspend all.
A001-01 09:30:03.428   722   733 I art     : ThreadId = 18, tid = 761, name = android.display, state = Runnable

A001-01 09:49:14.140   722   733 E art     : Unexpected time out during suspend all.
A001-01 09:49:14.141   722   733 I art     : ThreadId = 18, tid = 761, name = android.display, state = Runnable

A001-01 10:08:24.853   722   733 E art     : Unexpected time out during suspend all.
A001-01 10:08:24.853   722   733 I art     : ThreadId = 18, tid = 761, name = android.display, state = Runnable

debuggerd堆栈分析

  • system_server main线程
    • debuggerd native堆栈

      "system_server" sysTid=722
       #00 pc 000173e4  /system/lib/libc.so (syscall+28)
       #01 pc 000b69bd  /system/lib/libart.so (_ZN3art17ConditionVariable16WaitHoldingLocksEPNS_6ThreadE+92)
       #02 pc 0027aca3  /system/lib/libart.so (_ZN3art3JNI12NewStringUTFEP7_JNIEnvPKc+214)
       #03 pc 00091ee5  /system/lib/libandroid_runtime.so
       #04 pc 732e1e99  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
      
    • 查看对应的文件名和行号等信息

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroid_runtime.so 00091ee5

      android_content_AssetManager_getArrayStringResource
      frameworks/base/core/jni/android_util_AssetManager.cpp:1977
      
    • 相应的函数code

      1937static jobjectArray android_content_AssetManager_getArrayStringResource(JNIEnv* env, jobject clazz,
      1938                                                                        jint arrayResId)
      1939{
      1940    AssetManager* am = assetManagerForJavaObject(env, clazz);
      1941    if (am == NULL) {
      1942        return NULL;
      1943    }
      1944    const ResTable& res(am->getResources());
      1945
      1946    const ResTable::bag_entry* startOfBag;
      1947    const ssize_t N = res.lockBag(arrayResId, &startOfBag);
      1948    if (N < 0) {
      1949        return NULL;
      1950    }
      1951
      1952    jobjectArray array = env->NewObjectArray(N, g_stringClass, NULL);
      1953    if (env->ExceptionCheck()) {
      1954        res.unlockBag(startOfBag);
      1955        return NULL;
      1956    }
      1957
      1958    Res_value value;
      1959    const ResTable::bag_entry* bag = startOfBag;
      1960    size_t strLen = 0;
      1961    for (size_t i=0; ((ssize_t)i)<N; i++, bag++) {
      1962        value = bag->map.value;
      1963        jstring str = NULL;
      1964
      1965        // Take care of resolving the found resource to its final value.
      1966        ssize_t block = res.resolveReference(&value, bag->stringBlock, NULL);
      1967        if (kThrowOnBadId) {
      1968            if (block == BAD_INDEX) {
      1969                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
      1970                return array;
      1971            }
      1972        }
      1973        if (value.dataType == Res_value::TYPE_STRING) {
      1974            const ResStringPool* pool = res.getTableStringBlock(block);
      1975            const char* str8 = pool->string8At(value.data, &strLen);
      1976            if (str8 != NULL) {
      1977                str = env->NewStringUTF(str8);
      
  • android.display线程
    • debuggerd native堆栈

      "android.display" sysTid=761
       #00 pc 000173e4  /system/lib/libc.so (syscall+28)
       #01 pc 000476a5  /system/lib/libc.so (_ZL33__pthread_mutex_lock_with_timeoutP24pthread_mutex_internal_tbPK8timespec+176)
       #02 pc 00093975  /system/lib/libandroid_runtime.so
       #03 pc 732e17e5  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
      
    • 查看对应的文件名和行号等信息

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroid_runtime.so 00093975

      android_content_AssetManager_applyStyle
      frameworks/base/core/jni/android_util_AssetManager.cpp:1430
      
    • 相应的函数code

      1340static jboolean android_content_AssetManager_applyStyle(JNIEnv* env, jobject clazz,
      1341                                                        jlong themeToken,
      1342                                                        jint defStyleAttr,
      1343                                                        jint defStyleRes,
      1344                                                        jlong xmlParserToken,
      1345                                                        jintArray attrs,
      1346                                                        jintArray outValues,
      1347                                                        jintArray outIndices)
      1348{
      1349    if (themeToken == 0) {
      1350        jniThrowNullPointerException(env, "theme token");
      1351        return JNI_FALSE;
      1352    }
      1353    if (attrs == NULL) {
      1354        jniThrowNullPointerException(env, "attrs");
      1355        return JNI_FALSE;
      1356    }
      1357    if (outValues == NULL) {
      1358        jniThrowNullPointerException(env, "out values");
      1359        return JNI_FALSE;
      1360    }
      1361
      1362    if (kDebugStyles) {
      1363    ALOGI("APPLY STYLE: theme=0x%" PRIx64 " defStyleAttr=0x%x defStyleRes=0x%x "
      1364          "xml=0x%" PRIx64, themeToken, defStyleAttr, defStyleRes,
      1365          xmlParserToken);
      1366    }
      1367
      1368    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeToken);
      1369    const ResTable& res = theme->getResTable();
      1370    ResXMLParser* xmlParser = reinterpret_cast<ResXMLParser*>(xmlParserToken);
      1371    ResTable_config config;
      1372    Res_value value;
      1373
      1374    const jsize NI = env->GetArrayLength(attrs);
      1375    const jsize NV = env->GetArrayLength(outValues);
      1376    if (NV < (NI*STYLE_NUM_ENTRIES)) {
      1377        jniThrowException(env, "java/lang/IndexOutOfBoundsException", "out values too small");
      1378        return JNI_FALSE;
      1379    }
      1380
      1381    jint* src = (jint*)env->GetPrimitiveArrayCritical(attrs, 0);
      1382    if (src == NULL) {
      1383        return JNI_FALSE;
      1384    }
      1385
      1386    jint* baseDest = (jint*)env->GetPrimitiveArrayCritical(outValues, 0);
      1387    jint* dest = baseDest;
      1388    if (dest == NULL) {
      1389        env->ReleasePrimitiveArrayCritical(attrs, src, 0);
      1390        return JNI_FALSE;
      1391    }
      1392
      1393    jint* indices = NULL;
      1394    int indicesIdx = 0;
      1395    if (outIndices != NULL) {
      1396        if (env->GetArrayLength(outIndices) > NI) {
      1397            indices = (jint*)env->GetPrimitiveArrayCritical(outIndices, 0);
      1398        }
      1399    }
      1400
      1401    // Load default style from attribute, if specified...
      1402    uint32_t defStyleBagTypeSetFlags = 0;
      1403    if (defStyleAttr != 0) {
      1404        Res_value value;
      1405        if (theme->getAttribute(defStyleAttr, &value, &defStyleBagTypeSetFlags) >= 0) {
      1406            if (value.dataType == Res_value::TYPE_REFERENCE) {
      1407                defStyleRes = value.data;
      1408            }
      1409        }
      1410    }
      1411
      1412    // Retrieve the style class associated with the current XML tag.
      1413    int style = 0;
      1414    uint32_t styleBagTypeSetFlags = 0;
      1415    if (xmlParser != NULL) {
      1416        ssize_t idx = xmlParser->indexOfStyle();
      1417        if (idx >= 0 && xmlParser->getAttributeValue(idx, &value) >= 0) {
      1418            if (value.dataType == value.TYPE_ATTRIBUTE) {
      1419                if (theme->getAttribute(value.data, &value, &styleBagTypeSetFlags) < 0) {
      1420                    value.dataType = Res_value::TYPE_NULL;
      1421                }
      1422            }
      1423            if (value.dataType == value.TYPE_REFERENCE) {
      1424                style = value.data;
      1425            }
      1426        }
      1427    }
      1428
      1429    // Now lock down the resource object and start pulling stuff from it.
      1430    res.lock();
      
  • HeapTaskDaemon线程
        "HeapTaskDaemon" sysTid=733
           #00 pc 000173e4  /system/lib/libc.so (syscall+28)
           #01 pc 0033bcf1  /system/lib/libart.so (_ZN3art10ThreadList18SuspendAllInternalEPNS_6ThreadES2_S2_b+540)
           #02 pc 0033c2f7  /system/lib/libart.so (_ZN3art10ThreadList10SuspendAllEPKcb+374)
           #03 pc 0016eb45  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector11ScopedPauseC2EPS2_+32)
           #04 pc 001737dd  /system/lib/libart.so (_ZN3art2gc9collector9MarkSweep9RunPhasesEv+160)
           #05 pc 0016e555  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector3RunENS0_7GcCauseEb+248)
           #06 pc 00191a6d  /system/lib/libart.so (_ZN3art2gc4Heap22CollectGarbageInternalENS0_9collector6GcTypeENS0_7GcCauseEb+2364)
           #07 pc 0019734d  /system/lib/libart.so (_ZN3art2gc4Heap12ConcurrentGCEPNS_6ThreadEb+68)
           #08 pc 0019be83  /system/lib/libart.so (_ZN3art2gc4Heap16ConcurrentGCTask3RunEPNS_6ThreadE+18)
           #09 pc 001b4243  /system/lib/libart.so (_ZN3art2gc13TaskProcessor11RunAllTasksEPNS_6ThreadE+30)
           #10 pc 72ec101f  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
    

死锁现象总结

  • GC线程向各线程发送suspend request,并等待各线程suspend
  • main线程进入到JNI,拿到某模块一个mutex,并已suspend
  • android.display线程调用到JNI, 等待main线程释放mutex


    fastjni_deadlock1.png

最新复现

新的堆栈

  • system_server main线程

    • debuggerd native堆栈

      "system_server" sysTid=720
          #00 pc 000173e4  /system/lib/libc.so (syscall+28)
          #01 pc 000b62bd  /system/lib/libart.so (_ZN3art17ConditionVariable16WaitHoldingLocksEPNS_6ThreadE+92)
          #02 pc 00279a03  /system/lib/libart.so (_ZN3art3JNI12NewStringUTFEP7_JNIEnvPKc+214)
          #03 pc 00091ee5  /system/lib/libandroid_runtime.so
          #04 pc 72b51e99  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
      
    • 查看对应的文件名和行号等信息

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroid_runtime.so 00091ee5

      android_content_AssetManager_getArrayStringResource
      frameworks/base/core/jni/android_util_AssetManager.cpp:1977
      
  • Binder线程

    • debuggerd native堆栈

        "Binder:720_5" sysTid=944
        #00 pc 000173e4  /system/lib/libc.so (syscall+28)
        #01 pc 000476a5  /system/lib/libc.so (_ZL33__pthread_mutex_lock_with_timeoutP24pthread_mutex_internal_tbPK8timespec+176)
        #02 pc 0001cb49  /system/lib/libandroidfw.so (_ZN7android8ResTable13setParametersEPKNS_15ResTable_configE+24)
        #03 pc 00013993  /system/lib/libandroidfw.so (_ZNK7android12AssetManager26updateResourceParamsLockedEv+86)
        #04 pc 000138f9  /system/lib/libandroidfw.so (_ZN7android12AssetManager15setLocaleLockedEPKc+240)
        #05 pc 00013add  /system/lib/libandroidfw.so (_ZN7android12AssetManager16setConfigurationERKNS_15ResTable_configEPKc+60)
        #06 pc 00092b4f  /system/lib/libandroid_runtime.so
        #07 pc 72b5537d  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
      
    • 查看对应的文件名和行号等信息

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroidfw.so 00013993

      android::AssetManager::updateResourceParamsLocked() const
      /proc/self/cwd/frameworks/base/libs/androidfw/AssetManager.cpp:744
      

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroidfw.so 000138f9

      android::AssetManager::setLocaleLocked(char const*)
      /proc/self/cwd/frameworks/base/libs/androidfw/AssetManager.cpp:414
      

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroidfw.so 00013add

      android::AssetManager::setConfiguration(android::ResTable_config const&, char const*)
      /proc/self/cwd/frameworks/base/libs/androidfw/AssetManager.cpp:441
      

      $ arm-linux-androideabi-addr2line -C -f -e ~/symbols/system/lib/libandroid_runtime.so 00092b4f

      android_content_AssetManager_setConfiguration
      frameworks/base/core/jni/android_util_AssetManager.cpp:721
      
  • HeapTaskDaemon线程

    "HeapTaskDaemon" sysTid=731
       #00 pc 000173e4  /system/lib/libc.so (syscall+28)
       #01 pc 0033aa59  /system/lib/libart.so (_ZN3art10ThreadList18SuspendAllInternalEPNS_6ThreadES2_S2_b+516)
       #02 pc 0033b13f  /system/lib/libart.so (_ZN3art10ThreadList10SuspendAllEPKcb+374)
       #03 pc 0016e445  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector11ScopedPauseC2EPS2_+32)
       #04 pc 001730dd  /system/lib/libart.so (_ZN3art2gc9collector9MarkSweep9RunPhasesEv+160)
       #05 pc 0016de55  /system/lib/libart.so (_ZN3art2gc9collector16GarbageCollector3RunENS0_7GcCauseEb+248)
       #06 pc 0019136d  /system/lib/libart.so (_ZN3art2gc4Heap22CollectGarbageInternalENS0_9collector6GcTypeENS0_7GcCauseEb+2364)
       #07 pc 00196c4d  /system/lib/libart.so (_ZN3art2gc4Heap12ConcurrentGCEPNS_6ThreadEb+68)
       #08 pc 0019b783  /system/lib/libart.so (_ZN3art2gc4Heap16ConcurrentGCTask3RunEPNS_6ThreadE+18)
       #09 pc 001b39e3  /system/lib/libart.so (_ZN3art2gc13TaskProcessor11RunAllTasksEPNS_6ThreadE+30)
       #10 pc 7273101f  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x2830000)
    

新的死锁

  • 死锁如下
fastjni_deadlock2.png

Root Cause

  • 前面多次复现的JNI都跟frameworks/base下面的asset manager里面的JNI函数有关。

  • 对比了Android 6.0 vs. Android 7.0关于gAssetManagerMethods[]的差异,7.0比6.0在部分JNI函数的signature上增加了"!", 表示是fast JNI, 目的是提高性能。

    commit 46cfd93aa22b5a4acab4626c140415eef922445c
    Author: Jeff Sharkey <jsharkey@android.com>
    Date:   Mon Nov 2 18:39:45 2015 -0800
    
    Let's sprinkle some FastJNI into Resources.
    
    Before:
    
                   benchmark   us linear runtime
                    GetColor 14.9 ===========
                  GetInteger 19.9 ===============
        GetLayoutAndTraverse 38.4 =============================
                   GetString 38.5 ==============================
    
    After:
    
                   benchmark   us linear runtime
                    GetColor 13.9 ==========
                  GetInteger 18.8 ==============
        GetLayoutAndTraverse 38.1 =============================
                   GetString 38.2 ==============================
    
    Change-Id: I8c20e14182d2645bc62a0e7fc6345e298b11933c
    
    diff --git a/core/jni/android_util_AssetManager.cpp b/core/jni/android_util_AssetManager.cpp
    index c94bc64..55b7e7e 100644
    --- a/core/jni/android_util_AssetManager.cpp
    +++ b/core/jni/android_util_AssetManager.cpp
    @@ -2156,9 +2156,9 @@ static const JNINativeMethod gAssetManagerMethods[] = {
    ... ....
    -    { "applyStyle","(JIIJ[I[I[I)Z",
    +    { "applyStyle","!(JIIJ[I[I[I)Z",
         (void*) android_content_AssetManager_applyStyle },
    -    { "setConfiguration", "(IILjava/lang/String;IIIIIIIIIIIIII)V",
    +    { "setConfiguration", "!(IILjava/lang/String;IIIIIIIIIIIIII)V",
         (void*) android_content_AssetManager_setConfiguration },
    ... ...
    
  • 但ART在处理fast JNI时,不会进行状态切换

    extern uint32_t JniMethodStart(Thread* self) {
      JNIEnvExt* env = self->GetJniEnv();
      DCHECK(env != nullptr);
      uint32_t saved_local_ref_cookie = env->local_ref_cookie;
      env->local_ref_cookie = env->locals.GetSegmentState();
      ArtMethod* native_method = *self->GetManagedStack()->GetTopQuickFrame();
      if (!native_method->IsFastNative()) {
        // When not fast JNI we transition out of runnable.
        self->TransitionFromRunnableToSuspended(kNative);
      }
      return saved_local_ref_cookie;
    }
    

解决方案

  • Revert fast JNI optimization

    • 验证
      • 基于出问题的W16.50.4版本验证两轮monkey测试: 20台机器运行48小时没有复现
      • 合入patch后, 类似的定屏和Camera2 ANR问题不再出现.
  • AOSP

    Remove FastJNI optimization on AssetManager to avoid dead lock.

    https://android-review.googlesource.com/#/c/340143/

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