实例化 NSObject 导致内存不足崩溃 [英] Instantiating NSObject causes an out of memory crash
问题描述
运行以下代码时，应用程序崩溃(约 30 秒后)并显示以下堆栈跟踪.我觉得这很奇怪，因为我希望垃圾收集器清理这些内存.我们的应用程序具有类似的模式，并会因类似的堆栈跟踪而崩溃.
When running the below code, the app crashes (after ~30 seconds) with the below stacktrace. I find this very odd since I would expect the garbage collector to clean up this memory. Our application has a similar pattern and crashes with a similar stacktrace.
注释掉实例化 NSObject 成员的行，使应用程序运行而不会崩溃.注释掉实例化字节数组的行会使应用运行时间更长，但它仍然崩溃.
Commenting out the line that instantiates the NSObject member makes the app run without crash. Commenting out the line that instantiates the byte array makes the app run MUCH longer, but it still crashes.
Instruments 报告了一个非常稳定的应用程序实时字节数，并且检测导致应用程序运行更长时间而不会崩溃，但它仍然崩溃(大约 10 分钟后).不断的 Live Bytes 让我觉得垃圾收集器在工作.
Instruments reports a pretty well constant Live Bytes for the app and instrumenting causes the app to run much longer without crashing, but it does still crash (after ~10 minutes). The constant Live Bytes makes me feel like the garbage collector is working.
代码:
using System.Threading;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
namespace MyExample
{
public class Application
{
static void Main (string[] args)
{
UIApplication.Main(args);
}
}
public partial class AppDelegate : UIApplicationDelegate
{
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
Thread testThread = new Thread(BreakMe);
testThread.Start();
window.MakeKeyAndVisible();
return true;
}
private void BreakMe()
{
while(true)
{
using (var arPool = new NSAutoreleasePool())
{
MyGarbage garbage = new MyGarbage();
}
}
}
private class MyGarbage
{
byte[] _Foo = new byte[100000];
NSObject _Bar = new NSObject();
}
}
}
应用输出:
Mprotect failed at 0x493c000 (length 4096) with errno 12
Stacktrace:
at (wrapper managed-to-native) System.Array.CreateInstanceImpl (System.Type,int[],int[]) <0xffffffff>
at System.Array.CreateInstance (System.Type,int[]) <0x000bc>
at System.Array.CreateInstance (System.Type,int) <0x00057>
at System.MonoCustomAttrs.GetCustomAttributes (System.Reflection.ICustomAttributeProvider,System.Type,bool) <0x000db>
at System.MonoCustomAttrs.GetCustomAttribute (System.Reflection.ICustomAttributeProvider,System.Type,bool) <0x00033>
at System.Attribute.GetCustomAttribute (System.Reflection.MemberInfo,System.Type,bool) <0x0003f>
at MonoTouch.ObjCRuntime.Class.GetHandle (System.Type) <0x00037>
at MonoTouch.Foundation.NSObject.AllocIfNeeded () <0x00063>
at MonoTouch.Foundation.NSObject..ctor (MonoTouch.Foundation.NSObjectFlag) <0x00027>
at MonoTouch.Foundation.NSAutoreleasePool..ctor () <0x00037>
at MyExample.AppDelegate.BreakMe () [0x00000] in Main.cs:30
at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) <0x000cb>
Native stacktrace:
0 MyExample 0x002db308 mono_handle_native_sigsegv + 404
1 MyExample 0x002fa5dc sigabrt_signal_handler + 148
2 libsystem_c.dylib 0x369c972f _sigtramp + 42
3 libsystem_c.dylib 0x369be3bb pthread_kill + 58
4 libsystem_c.dylib 0x369b6bff abort + 78
5 MyExample 0x0041e484 GC_remap + 200
6 MyExample 0x00411ee4 GC_allochblk_nth + 1536
7 MyExample 0x00411894 GC_allochblk + 96
8 MyExample 0x0041d94c GC_new_hblk + 116
9 MyExample 0x00413c3c GC_allocobj + 188
10 MyExample 0x0041859c GC_generic_malloc_inner + 352
11 MyExample 0x004187ac GC_generic_malloc + 132
12 MyExample 0x00418c60 GC_malloc + 208
13 MyExample 0x003a67dc mono_object_allocate + 64
14 MyExample 0x003a7240 mono_array_new_full + 828
15 MyExample 0x00341324 ves_icall_System_Array_CreateInstanceImpl + 896
16 MyExample 0x0012cf3c (wrapper managed-to-native) System.Array:CreateInstanceImpl (System.Type,int[],int[]) + 80
17 MyExample 0x0012d23c System.Array:CreateInstance (System.Type,int) + 88
18 MyExample 0x0018b70c System.MonoCustomAttrs:GetCustomAttributes (System.Reflection.ICustomAttributeProvider,System.Type,bool) + 220
19 MyExample 0x0018b560 System.MonoCustomAttrs:GetCustomAttribute (System.Reflection.ICustomAttributeProvider,System.Type,bool) + 52
20 MyExample 0x00131fd0 System.Attribute:GetCustomAttribute (System.Reflection.MemberInfo,System.Type,bool) + 64
21 MyExample 0x000795ec MonoTouch.ObjCRuntime.Class:GetHandle (System.Type) + 56
22 MyExample 0x00077e60 MonoTouch.Foundation.NSObject:AllocIfNeeded () + 100
23 MyExample 0x0007779c MonoTouch.Foundation.NSObject:.ctor (MonoTouch.Foundation.NSObjectFlag) + 40
24 MyExample 0x00074d10 MonoTouch.Foundation.NSAutoreleasePool:.ctor () + 56
25 MyExample 0x00002c34 MyExample.AppDelegate:BreakMe () + 164
26 MyExample 0x001f3e3c (wrapper runtime-invoke) object:runtime_invoke_dynamic (intptr,intptr,intptr,intptr) + 204
27 MyExample 0x002c4658 mono_jit_runtime_invoke + 3032
28 MyExample 0x003a34a8 mono_runtime_invoke + 140
29 MyExample 0x003a48f0 mono_runtime_delegate_invoke + 136
30 MyExample 0x003cb31c start_wrapper + 752
31 MyExample 0x003f09a0 thread_start_routine + 240
32 MyExample 0x0041f9ac GC_start_routine + 132
33 libsystem_c.dylib 0x369be311 _pthread_start + 248
34 libsystem_c.dylib 0x369bfbbc start_wqthread + 0
推荐答案
对此的真正答案是怀疑，问题已在 中解决为什么我们的 MonoTouch 应用程序会在垃圾收集器中崩溃?它不是内存不足，这是内存管理器的问题.堆栈跟踪对我来说非常熟悉.
The true answer to this is, is suspect, the issue resolved in Why is our MonoTouch app breaking in the garbage collector? It is not out of memory which was a memory manager issue. The stack trace is very familiar to me.
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