问题
I'm seeing the following crash report, but it's not reproducible. How would I go about debugging it? Is this an AFNetworking issue? I'm using version 2.4.1.
Crashed: com.apple.NSURLSession-work
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x0000000000000000
Thread : Crashed: com.apple.NSURLSession-work
0 CoreFoundation 0x0000000184aad978 CFDictionaryGetValue + 56
1 Foundation 0x0000000185aa9300 _NSSetLongLongValueAndNotify + 72
2 Foundation 0x0000000185aa9300 _NSSetLongLongValueAndNotify + 72
3 CFNetwork 0x0000000184543468 -[__NSCFLocalSessionTask _task_onqueue_didFinish] + 472
4 CFNetwork 0x0000000184544b38 -[__NSCFLocalSessionTask connection:didFinishLoadingWithError:] + 40
5 CFNetwork 0x000000018458d030 __46-[__NSCFURLSessionConnection _task_sendFinish]_block_invoke + 136
6 libdispatch.dylib 0x0000000196a49994 _dispatch_call_block_and_release + 24
7 libdispatch.dylib 0x0000000196a49954 _dispatch_client_callout + 16
8 libdispatch.dylib 0x0000000196a540a4 _dispatch_queue_drain + 1448
9 libdispatch.dylib 0x0000000196a4ca5c _dispatch_queue_invoke + 132
10 libdispatch.dylib 0x0000000196a56318 _dispatch_root_queue_drain + 720
11 libdispatch.dylib 0x0000000196a57c4c _dispatch_worker_thread3 + 108
12 libsystem_pthread.dylib 0x0000000196c2922c _pthread_wqthread + 816
回答1:
Yes, it's probably an AFNetworking bug (fixed in 2.5.0), in all likelihood. Specifically, this one:
https://github.com/AFNetworking/AFNetworking/issues/1477
If not, then it is probably something similar—a key-value observer trying to observe some aspect of a URL session task has been deallocated and didn't stop observing that task prior to being deallocated.
来源：https://stackoverflow.com/questions/32490808/com-apple-nsurlsession-work-exc-bad-access-crash-debugging