site_archiver@lists.apple.com Delivered-To: macnetworkprog@lists.apple.com Hi, Try adding an implementation of the NSURLSessionStreamDelegate method: - (void)URLSession:(NSURLSession *)session streamTask:(NSURLSessionStreamTask *)streamTask didBecomeInputStream:(NSInputStream *)inputStream outputStream:(NSOutputStream *)outputStream; It’s not required, but it *might* work-around and prevent the crash. — jrj

On Mar 6, 2018, at 9:19 AM, Jens Alfke <jens@mooseyard.com> wrote:

In testing our library, which uses NSURLSessionStreamTask, we're seeing a crash that only occurs in iOS 10.2 [simulator], not iOS 11. The crash doesn't involve our code — it's on the system 'com.apple.NSURLSession-work' queue, in a method of the internal __NSCFURLLocalStreamTask class:

* thread #13, queue = 'com.apple.NSURLSession-work', stop reason = EXC_BAD_ACCESS (code=1, address=0x10) * frame #0: 0x00000001141d9757 CFNetwork`-[__NSCFURLLocalStreamTask _onSessionQueue_disavow] + 34 frame #1: 0x000000011403da97 CFNetwork`__51-[NSURLSession delegate_task:didCompleteWithError:]_block_invoke_2 + 31 frame #2: 0x000000010c43e122 libclang_rt.asan_iossim_dynamic.dylib`__wrap_dispatch_async_block_invoke + 290 frame #3: 0x0000000114bbf808 libdispatch.dylib`_dispatch_call_block_and_release + 12 …

Is this a known bug in iOS 10 that was fixed in iOS 11? I'm not directly involved in debugging this; the engineer who is commented:

...

This seems to be an issue with NSURLSession's stream task on iOS 10.2 that canceling the task after an error could cause the crash down in __NSCFURLLocalStreamTask. I also noticed a weird issue that -URLSession:task:didCompleteWithError: is called twice.

(If you want to see the full details, they're in https://github.com/couchbase/couchbase-lite-ios/issues/2089 .)

—Jens _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/macnetworkprog/jrj%40apple.com

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