Open Radar

 
Summary:
We have intermittent crashes happening with a TCPIOConnection stack trace. These started to happen more frequently with later iOS versions, most notably iOS 11.3.

Steps to Reproduce:
We have no reproduction steps, but maybe the following stack trace is useful:

Hardware Model:     iPhone10,3
Process:            Lyft
Identifier:         com.zimride.instant
Version:            5.23.3
OS Version:         iOS 11.3



SIGABRT: 

0  libsystem_kernel.dylib  ___pthread_kill
1  libsystem_pthread.dylib _pthread_kill$VARIANT$armv81
2  libsystem_c.dylib       _abort
3  libsystem_c.dylib       ___assert_rtn
4  CFNetwork               TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void ( block_pointer)(), bool)
5  libnetwork.dylib        ___tcp_connection_set_tls_message_handler_on_nw_connection_block_invoke
6  libboringssl.dylib      ___boringssl_session_trigger_callback_block_invoke
7  libdispatch.dylib       __dispatch_call_block_and_release
8  libdispatch.dylib       __dispatch_client_callout
9  libdispatch.dylib       __dispatch_queue_serial_drain$VARIANT$armv81
10 libdispatch.dylib       __dispatch_queue_invoke$VARIANT$armv81
11 libdispatch.dylib       __dispatch_queue_serial_drain$VARIANT$armv81
12 libdispatch.dylib       __dispatch_queue_invoke$VARIANT$armv81
13 libdispatch.dylib       __dispatch_root_queue_drain_deferred_wlh$VARIANT$armv81
14 libdispatch.dylib       __dispatch_workloop_worker_thread$VARIANT$armv81
15 libsystem_pthread.dylib __pthread_wqthread

Expected Results:
The app doesn’t crash

Actual Results:
The app crashes

Version:
11.3 (and before)

Notes:
It seems like other people are having similar problems, as is evident from this discussion on the Apple forums: https://forums.developer.apple.com/thread/83123.