Crash in -[__NSCFURLLocalStreamTask _onSessionQueue_disavow], only on iOS 10
Crash in -[__NSCFURLLocalStreamTask _onSessionQueue_disavow], only on iOS 10
- Subject: Crash in -[__NSCFURLLocalStreamTask _onSessionQueue_disavow], only on iOS 10
- From: Jens Alfke <email@hidden>
- Date: Tue, 06 Mar 2018 09:19:15 -0800
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
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