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Webgl平台GC报错ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds #741

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cyinwind opened this issue May 11, 2020 · 13 comments
Open

Webgl平台GC报错ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds #741

cyinwind opened this issue May 11, 2020 · 13 comments

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@cyinwind
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猜测原因：
webgl平台对线程支持不完善，具体的报错我贴到最后。
我的解决方案：
用LockFreeQueue refQueue 替换 QueuerefQueue
以下是LockFreeQueue的代码，供参考：

public class LockFreeQueue
{
internal class SingleLinkNode where U : T
{
public SingleLinkNode Next;
public U Item;
}
static private bool CAS(ref V location, V comparand, V newValue) where V : class
{
return comparand == Interlocked.CompareExchange(ref location, newValue, comparand);
}

    SingleLinkNode<T> head;
    SingleLinkNode<T> tail;
    int count;

    public int Count { get { return count; } }
    public bool IsEmpty { get { return count <= 0; } }

    public LockFreeQueue()
    {
        head = new SingleLinkNode<T>();
        tail = head;
        count = 0;
    }

    public void Enqueue(T item)
    {
        SingleLinkNode<T> oldTail = null;
        SingleLinkNode<T> oldTailNext;

        SingleLinkNode<T> newNode = new SingleLinkNode<T>();
        newNode.Item = item;

        bool newNodeAdded = false;
        while (!newNodeAdded)
        {
            oldTail = tail;
            oldTailNext = oldTail.Next;

            if (tail == oldTail)
            {
                if (oldTailNext == null)
                    newNodeAdded = CAS<SingleLinkNode<T>>(ref tail.Next, null, newNode);
                else
                    CAS<SingleLinkNode<T>>(ref tail, oldTail, oldTailNext);
            }
        }
        CAS<SingleLinkNode<T>>(ref tail, oldTail, newNode);
        Interlocked.Increment(ref count);
    }

    public bool TryDequeue(out T item)
    {
        item = default(T);
        SingleLinkNode<T> oldHead = null;

        bool haveAdvancedHead = false;
        while (!haveAdvancedHead)
        {
            oldHead = head;
            SingleLinkNode<T> oldTail = tail;
            SingleLinkNode<T> oldHeadNext = oldHead.Next;

            if (oldHead == head)
            {
                if (oldHead == oldTail)
                {
                    if (oldHeadNext == null)
                    {
                        return false;
                    }
                    CAS<SingleLinkNode<T>>(ref tail, oldTail, oldHeadNext);
                }
                else
                {
                    item = oldHeadNext.Item;
                    haveAdvancedHead = CAS<SingleLinkNode<T>>(ref head, oldHead, oldHeadNext);
                }
            }
        }
        Interlocked.Decrement(ref count);
        return true;
    }

    public T Dequeue()
    {
        T result;
        if (TryDequeue(out result)) return result;
        return default(T);
    }

    public void Clear()
    {
        while (Count > 0)
        {
            Dequeue();
        }
    }
}

浏览器报错信息如下：

ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds
at System.Array.Copy (System.Array sourceArray, System.Int32 sourceIndex, System.Array destinationArray, System.Int32 destinationIndex, System.Int32 length) [0x00000] in <00000000000000000000000000000000>:0

(Filename: currently not available on il2cpp Line: -1)

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_DelegateBridge___Gen_Delegate_Imp9_m759BEA6495C6F009E332C1AD0D859559BFA88313 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21078901
_DeserializationEventHandler_Invoke_mE08F6E81D9791C6A69EA7BFCF50FA33B237B35D3 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:13469886
dynCall_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21636861
dynCall_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28235
invoke_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:19054
_LuaWebsock_U3C_ctorU3Eb__12_0_m13E0E8609C65069BA2CCA6A2C664E556D08E240A blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:20934740
_ThreadStart_Invoke_m11B6A66E82F02C74399A7314C14C7F52393CC4B4 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:13796822
_WebSocket_DelegateOnOpenEvent_m9C6342AA07D1461D403BA1C32538B1062B945962 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:17189401
_WebSocketFactory_DelegateOnOpenEvent_mB0CF6AB6CC5075461678E3A62D23A2E55EA2D5A6 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:17190262
dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21636298
dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28135
invoke_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:18854
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dynCall_vi blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21635446
dynCall_vi blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:27985
dynCall blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:579
onopen
@cyinwind
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补充：
修改的代码在LuaEnv.cs中，如下：
public void Tick()
{
#if THREAD_SAFE || HOTFIX_ENABLE
lock (luaEnvLock)
{
#endif
var _L = L;
//lock (refQueue)
//{
while (refQueue.Count > 0)
{
GCAction gca = refQueue.Dequeue();
translator.ReleaseLuaBase(_L, gca.Reference, gca.IsDelegate);
}
//}
#if !XLUA_GENERAL
last_check_point = translator.objects.Check(last_check_point, max_check_per_tick, object_valid_checker, translator.reverseMap);
#endif
#if THREAD_SAFE || HOTFIX_ENABLE
}
#endif
}
LockFreeQueue refQueue = new LockFreeQueue();
internal void equeueGCAction(GCAction action)
{
refQueue.Enqueue(action);
// lock (refQueue)
// {
// refQueue.Enqueue(action);
// }
}

@chexiongsheng
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浏览器执行都是单线程。感觉直接加个条件编译宏，如果是WEBGL就别lock就可以了

@cyinwind
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用非锁互斥队列性能也比Lock好点，所以我就替换了

@cyinwind
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另外，我能问问，为啥 webgl 不用 luajit么？这个支持方便么?

@chexiongsheng
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lua是c写的，c支持的平台就支持。
luajit部分代码是用汇编写的，luajit写了哪个平台的就支持哪个平台。所以这个问题问luajit作者比较合适。

@linkliu
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linkliu commented Oct 28, 2022

@cyinwind 大佬，我把你的LockFreeQueue代码拉取下来，但是报错了，请问我可以参考一下你的代码吗
image

@linkliu
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linkliu commented Oct 31, 2022

@cyinwind 大佬，我把你的LockFreeQueue代码拉取下来，但是报错了，请问我可以参考一下你的代码吗 image

解决了，我把代码改成下面的样子就没有问题了

using System.Threading;

namespace XLua
{
    public class LockFreeQueue<T>
    {
        internal class SingleLinkNode<U> where U : T
        {
            public SingleLinkNode<U> Next;
            public U Item;
        }

        static private bool CAS<T>(ref T location, T comparand, T newValue) where T : class
        {
            return comparand == Interlocked.CompareExchange(ref location, newValue, comparand);
        }

        SingleLinkNode<T> head;
        SingleLinkNode<T> tail;
        int count;

        public int Count
        {
            get { return count; }
        }

        public bool IsEmpty
        {
            get { return count <= 0; }
        }

        public LockFreeQueue()
        {
            head = new SingleLinkNode<T>();
            tail = head;
            count = 0;
        }

        public void Enqueue(T item)
        {
            SingleLinkNode<T> oldTail = null;
            SingleLinkNode<T> oldTailNext;

            SingleLinkNode<T> newNode = new SingleLinkNode<T>();
            newNode.Item = item;

            bool newNodeAdded = false;
            while (!newNodeAdded)
            {
                oldTail = tail;
                oldTailNext = oldTail.Next;

                if (tail == oldTail)
                {
                    if (oldTailNext == null)
                        newNodeAdded = CAS<SingleLinkNode<T>>(ref tail.Next, null, newNode);
                    else
                        CAS<SingleLinkNode<T>>(ref tail, oldTail, oldTailNext);
                }
            }

            CAS<SingleLinkNode<T>>(ref tail, oldTail, newNode);
            Interlocked.Increment(ref count);
        }

        public bool TryDequeue(out T item)
        {
            item = default(T);
            SingleLinkNode<T> oldHead = null;

            bool haveAdvancedHead = false;
            while (!haveAdvancedHead)
            {
                oldHead = head;
                SingleLinkNode<T> oldTail = tail;
                SingleLinkNode<T> oldHeadNext = oldHead.Next;

                if (oldHead == head)
                {
                    if (oldHead == oldTail)
                    {
                        if (oldHeadNext == null)
                        {
                            return false;
                        }

                        CAS<SingleLinkNode<T>>(ref tail, oldTail, oldHeadNext);
                    }
                    else
                    {
                        item = oldHeadNext.Item;
                        haveAdvancedHead = CAS<SingleLinkNode<T>>(ref head, oldHead, oldHeadNext);
                    }
                }
            }

            Interlocked.Decrement(ref count);
            return true;
        }

        public T Dequeue()
        {
            T result;
            if (TryDequeue(out result)) return result;
            return default(T);
        }

        public void Clear()
        {
            while (Count > 0)
            {
                Dequeue();
            }
        }
    }
}

@ripwu
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ripwu commented Jan 17, 2023 •
edited
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浏览器执行都是单线程。感觉直接加个条件编译宏，如果是WEBGL就别lock就可以了

@chexiongsheng 测试了下，不一定对。这个 issue 和多线程无关。主要是因为 GC 时调用了 Dispose，它会调用 refQueue.Enqueue，而这可能会导致 refQueue 扩容。为了满足扩容的内存需求，refQueue.Enqueue 可能会再次引起 GC，导致调用第二个 LuaBase 的 Dispose，它又再次调用 refQueue.Enqueue。也就是说 refQueue.Enqueue 可能导致 Queue.SetCapacity 的重入 （表现上像是多线程并发），因而 Destination array was not long enough。

至于重入，可能是因为 lock (refQueue) 的锁 Monitor 是个递归锁，同个线程可以重入，而不会死锁。参考 MSDN 文档

It is legal for the same thread to invoke Enter more than once without it blocking; however, an equal number of Exit calls must be invoked before other threads waiting on the object will unblock.

一种解决方案是上面大佬发的使用 CAS 实现 LockFreeQueue。

（如果有使用 tolua 的童鞋找到这个 issue）tolua 同样存在这个问题，但 tolua 是 gcList，在 tolua 要实现 LockFreeList 会相对麻烦些，因为还要支持在任意节点 RemoveAt() 的需求。如果只想简单的 fix，可以在 gcList 初始化时分配足够的 capacity，如 List<GCRef> gcList = new List<GCRef>(4096);，其中的 4096 是拍脑袋的，原则是 gcList 不扩容即可。

xLua 这个 issue 可能也可以这样绕过。

@ripwu ripwu mentioned this issue Jan 18, 2023
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@klistin
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klistin commented Jan 15, 2024

@ripwu 那按照你这个说法，之前的android或者IOS平台也会报这个错误才对，为什么没有呢？

@lybmccree
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lybmccree commented Jul 5, 2024 •
edited
Loading

微信小游戏 webgl 也遇到类似 array.copy爆了， websocket调用过来，异步，也GC炸锅了，XLua原版，啥都没改也有问题，不是只有主线程吗，不懂，求大神指导

@lybmccree
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lybmccree commented Jul 8, 2024 •
edited
Loading

浏览器执行都是单线程。感觉直接加个条件编译宏，如果是WEBGL就别lock就可以了

@chexiongsheng 测试了下，不一定对。这个 issue 和多线程无关。主要是因为 GC 时调用了 Dispose，它会调用 refQueue.Enqueue，而这可能会导致 refQueue 扩容。为了满足扩容的内存需求，refQueue.Enqueue 可能会再次引起 GC，导致调用第二个 LuaBase 的 Dispose，它又再次调用 refQueue.Enqueue。也就是说 refQueue.Enqueue 可能导致 Queue.SetCapacity 的重入 （表现上像是多线程并发），因而 Destination array was not long enough。

至于重入，可能是因为 lock (refQueue) 的锁 Monitor 是个递归锁，同个线程可以重入，而不会死锁。参考 MSDN 文档

It is legal for the same thread to invoke Enter more than once without it blocking; however, an equal number of Exit calls must be invoked before other threads waiting on the object will unblock.

一种解决方案是上面大佬发的使用 CAS 实现 LockFreeQueue。

（如果有使用 tolua 的童鞋找到这个 issue）tolua 同样存在这个问题，但 tolua 是 gcList，在 tolua 要实现 LockFreeList 会相对麻烦些，因为还要支持在任意节点 RemoveAt() 的需求。如果只想简单的 fix，可以在 gcList 初始化时分配足够的 capacity，如 List<GCRef> gcList = new List<GCRef>(4096);，其中的 4096 是拍脑袋的，原则是 gcList 不扩容即可。

xLua 这个 issue 可能也可以这样绕过。

像webgl微信小游戏同一个主线程，不是有顺序的吗，重入，也不应该会导致这个问题出现，虽然现实中确实坑爹的出现了这个问题，无解~

@klpk
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klpk commented Aug 23, 2024

最近刚把项目做了点修改测一下微信小游戏，也遇到了，引擎是团结1.2.2
plugin.js:93 ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds
Parameter name: destinationArray
at System.Array.Copy (System.Array sourceArray, System.Int32 sourceIndex, System.Array destinationArray, System.Int32 destinationIndex, System.Int32 length) [0x00000] in <00000000000000000000000000000000>:0

(env: Windows,mg,1.06.2405020; lib: 3.2.5)
e.printErr @ plugin.js:93
_JS_Log_Dump @ webgl.wasm.framework.unityweb.js:1262
WebGLPrintfConsolev(LogType, char const*, void*) @ 0b10b0a6:0xbb9b8
InternalErrorConsole(char const*, ...) @ 0b10b0a6:0x205b025
DebugStringToFilePostprocessedStacktrace(DebugStringToFileData const&) @ 0b10b0a6:0x205ae2b
DebugStringToFile(DebugStringToFileData const&) @ 0b10b0a6:0x205a4e3
Scripting::LogExceptionFromManaged(ScriptingExceptionPtr, int, char const*, bool, Scripting::LogExceptionFromMangedSettings const*) @ 0b10b0a6:0x1f79f2f
DebugLogHandler_CUSTOM_Internal_LogException(Il2CppObject*, Il2CppObject*) @ 0b10b0a6:0x1f95632
DebugLogHandler_LogException_mF66A663A86BF5D412BC9A4B3F92DA5CF61049F08 @ 0b10b0a6:0xba295e
Logger_LogException_m591AF39F0886DA44666068EDBBD3CCF07623CFBB @ 0b10b0a6:0x15cae9
Debug_LogException_mAB3F4DC7297ED8FBB49DAA718B70E59A6B0171B0 @ 0b10b0a6:0xb9d117
U3CU3Ec_U3CRegisterUECatcherU3Eb__0_0_mD21DF44CEC3DA35516DA5FC75CA8A2FF67E4E382 @ 0b10b0a6:0xd49f6c
KeyGeneratedEventHandler_Invoke_mD73F8C7BC0305037EC520C3F4AF3DE74E5481DDA @ 0b10b0a6:0x2430d8
RuntimeInvoker_TrueVoid_t4861ACF8F4594C3437BB48B6E56783494B843915_VoidU2A_t104EAEFBD2D237A8C29618913DA9B4D99355E965_VoidU2A_t104EAEFBD2D237A8C29618913DA9B4D99355E965(void ()(), MethodInfo const, void*, void**, void*) @ 0b10b0a6:0x1398de4
il2cpp::vm::Runtime::InvokeWithThrow(MethodInfo const*, void*, void**) @ 0b10b0a6:0x13cfad3
dynCall_iiii @ 0b10b0a6:0x206520a
invoke_iiii @ webgl.wasm.framework.unityweb.js:1277
il2cpp::vm::Runtime::Invoke(MethodInfo const*, void*, void**, Il2CppException**) @ 0b10b0a6:0x13cea8a
il2cpp::vm::Runtime::UnhandledException(Il2CppException*) @ 0b10b0a6:0x13d018d
il2cpp::gc::GarbageCollector::RunFinalizer(void*, void*) @ 0b10b0a6:0x101865
GC_try_to_collect_general @ 0b10b0a6:0xc707c
GC_gcollect @ 0b10b0a6:0xc7108
il2cpp_gc_collect_a_little @ 0b10b0a6:0x13e8122
MainLoop() @ 0b10b0a6:0x1e88cf4
dynCall_v @ 0b10b0a6:0x2065228
browserIterationFunc @ webgl.wasm.framework.unityweb.js:1277
callUserCallback @ webgl.wasm.framework.unityweb.js:1277
runIter @ webgl.wasm.framework.unityweb.js:1277
Browser_mainLoop_runner @ webgl.wasm.framework.unityweb.js:1275

@SiMaLaoShi
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tolua也遇到了

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@chexiongsheng @ripwu @linkliu @klistin @cyinwind @SiMaLaoShi @klpk @lybmccree