We are also getting similar crashes for what should be simple NSMutableURLRequest. All the crashes occur within estimatedPropertyListSize, which appears to be an internal CFNetwork method which is spontaneously being called.
We do not access the CFNetwork instance directly, it is entirely being managed by the URLRequest.
0 CFNetwork 0x000000019d93d150 _CFStreamErrorFromCFError + 54920
1 CFNetwork 0x000000019d915434 CFURLConnectionInvalidateConnectionCache + 17224
2 CoreFoundation 0x000000019c727c80 _CFStreamClose + 104
3 CFNetwork 0x000000019d993de8 _CFStreamErrorFromCFError + 410396
4 CFNetwork 0x000000019d993d74 _CFStreamErrorFromCFError + 410280
5 CoreFoundation 0x000000019c726550 _CFRelease + 288
6 CFNetwork 0x000000019daad8f8 estimatedPropertyListSize + 41472
7 libdispatch.dylib 0x00000001a461513c _dispatch_call_block_and_release + 28
8 libdispatch.dylib 0x00000001a4616dd4 _dispatch_client_callout + 16
9 libdispatch.dylib 0x00000001a461e400 _dispatch_lane_serial_drain + 744
10 libdispatch.dylib 0x00000001a461ef64 _dispatch_lane_invoke + 428
11 libdispatch.dylib 0x00000001a4620284 _dispatch_workloop_invoke + 1752
12 libdispatch.dylib 0x00000001a4629cb4 _dispatch_root_queue_drain_deferred_wlh + 284
13 libdispatch.dylib 0x00000001a4629528 _dispatch_workloop_worker_thread + 400
14 libsystem_pthread.dylib 0x00000001f86fcf20 _pthread_wqthread + 284
15 libsystem_pthread.dylib 0x00000001f86fcfc0 start_wqthread + 4
report-2516849530370009999-e9956979-400f-4f7f-8179-cd92279c3989.txt
seaiq
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This is a big problem for us, too.