_dispatch_client_callout crash

Do you have a third-party crash reporter in play here?

The reason I ask is that your crash report is inconsistent. See this:

Crashed Thread:        15

and this:

Thread 0 Crashed:

and this:

Thread 15 Crashed:

The Apple crash reporter is generally pretty good about avoiding problems like this.

Anyway, assuming that thread 15 is the one that crashed, its backtrace looks like this:

Thread 15 Crashed:
0   libsystem_kernel.dylib  … __pthread_kill + 10
1   libsystem_pthread.dylib … pthread_kill + 263 (pthread.c:1668)
2   libsystem_c.dylib       … abort + 123 (abort.c:118)
3   libc++abi.dylib         … abort_message + 241 (abort_message.cpp:78)
4   libc++abi.dylib         … demangling_terminate_handler() + 266 (cxa_default_handlers.cpp:71)
5   libobjc.A.dylib         … _objc_terminate() + 96 (objc-exception.mm:701)
6   libc++abi.dylib         … std::__terminate(void (*)()) + 8 (cxa_handlers.cpp:59)
7   libc++abi.dylib         … std::terminate() + 56 (cxa_handlers.cpp:88)
8   libdispatch.dylib       … _dispatch_client_callout + 28 (object.m:563)

Frame 7 through 0 are what you see when some code throws an unhandled language exception. Frame 8 indicates that Dispatch is calling a block on queue. There’s no Last Exception Backtrace section, so it’s likely that this was a C++ exception.

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—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Did you figure things out?

I am see a very similar stack trace during a TestFlight test - and I am not quite sure how to track it down

0 libsystem_kernel.. _pthread_kill
1 libsystem_pthre…. pthread_kill
2 libsystem_c.dylib abort
3 libc++abi.dylib abort_message
4 libc++abi.dylib demangling_terminate_handler()
5 libobjc.A.dylib _objc_terminate()|
6 libc++abi.dylib std::_ terminate (void (*)())
7 libc++abi.dylib std::terminate()
8 libdispatch.dylib _dispatch_client_callout  <---
9 libdispatch.dylib _dispatch_root_queue_drain
10 libdispatch.dylib _dispatch_worker_thread2
11 libsystem_pthre. _pthread_wathread
12 libsystem_pthre.. start_wathread

Please start a new thread for this, making sure to include your full crash report per the advice in Posting a Crash Report. Tag it with Debugging so that I see it. Also, if you want to post a link here that points to your new thread, that’d be fab.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"