Question

我在使用SocketRocket时遇到iOS EXC_BAD_ACCESS错误，我想知道我可以做些什么来进一步调试问题，以确定问题是在我身边还是在SocketRocket一侧。

我得到的堆栈跟踪是：

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x2000000c
raw
0    libobjc.A.dylib     objc_msgSend + 5
1    OMlearnings         SRWebSocket.m line 692    __30-[SRWebSocket _failWithError:]_block_invoke_2
2    libdispatch.dylib   _dispatch_call_block_and_release + 10
10   UIKit               UIApplicationMain + 1136
11   OMlearnings         main.m line 16    main

或有时

Crashed: NSOperationQueue Serial Queue
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0xc
raw
0    libobjc.A.dylib     objc_msgSend + 5
1    OMlearnings         SRWebSocket.m line 613    -[SRWebSocket scheduleInRunLoop:forMode:]
2    OMlearnings         SRWebSocket.m line 600    -[SRWebSocket _connect]
3    OMlearnings         OMSRealTimeTeamDashboard.m line 157    -[OMSRealTimeTeamDashboard sendMessage:]
4    OMlearnings         OMSRealTimeTeamDashboard.m line 171    -[OMSRealTimeTeamDashboard eventReceived:]
5    CoreFoundation      __invoking___ + 68
6    CoreFoundation      -[NSInvocation invoke] + 282
7    Foundation          -[NSInvocationOperation main] + 112
8    Foundation          -[__NSOperationInternal _start:] + 770
14   libsystem_pthread.dylib _pthread_wqthread + 298

我的代码库非常简单，基本上订阅事件，并在队列中执行socketrocket sendMessage（以处理并发）

[signalServices subscribe:my-event toBlock:^(NSNotification * notification) {
    [this.queue addOperation:[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(eventReceived:) object:notification]];
}];

- (void)eventReceived: (NSNotification *)notification {
    // ...
    [socket send:[NSString stringWithFormat:@"%i,1,%@", currentUserId.intValue, [NSNumber numberWithInt: rate.value]]];
}

我读过使用NSZombies调试问题的人，但我的问题很少发生，所以在问题变得可见之前我可能会耗尽内存。它在99％的时间内都能正常工作。

有什么值得了解的iOS可能会随机崩溃使用套接字的应用程序等吗？例如，我们启用了后台提取，这可能是导致某些随机崩溃的原因吗？

谢谢！

Answer 1

在堆栈跟踪中，

0    libobjc.A.dylib     objc_msgSend + 5
1    OMlearnings         SRWebSocket.m line 692    __30-[SRWebSocket _failWithError:]_block_invoke_2

EXC_BAD_ACCESS出现在此行https://github.com/square/SocketRocket/blob/master/SocketRocket/SRWebSocket.m#L692

中

[self.delegate webSocket:self didFailWithError:error];

根据该文件，https://github.com/square/SocketRocket

SRWebSocket
(unlike NSURLConnection, SRWebSocket won't retain the delegate)

@property (nonatomic, assign) id <SRWebSocketDelegate> delegate;

SRWebSocket对象未保留委托属性，因此，如果您不保留委托对象，它将与悬空指针一起崩溃。你如何对委托对象有强烈的参考？

如何在iOS上调试iOS EXC_BAD_ACCESS KERN_INVALID_ADDRESS

1 个答案: