ios - NSURLSession invalidateAndCancel EXC_BAD_ACCESS -


I am using NSURLSession with NSURLSessionDataTasks so that background data can be brought to my app. I am looking at the EXC_BAD_ACCESS crashes on the background thread with steak trace:

Displays deeply that dispatch_group_notify_f is trying to retain zero.

Why can this happen in my code?

I was not able to solve this problem, only invalid and can not call the call and I am waiting to complete the work in the event of an error in return. I am sure that further investigation could have found a way to stop it, but it was easy to work around it.


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