Crash line in dispatch_source_set_timer:
(+24) ldr x24, [x0, #0x58]
crash register is
x0(0x0000000000000058)
So, It looks like CFNetworkSetATSContext build a null dispatch_source_t to call dispatch_source_set_timer(dispatch_source_t source, ...) In some cases.
crash report:
Exception Type: SIGSEGV
Exception Codes: SEGV_ACCERR at 0x0000000000000058
Crashed Thread: 42
...
Thread 42 crashed with ARM 64 Thread State:
x0: 000000000000000000 x1: 0x00000030b2d7293c x2: 0xffffffffffffffff x3: 0x000000003b9aca00
x4: 0x0000000280e22200 x5: 000000000000000000 x6: 0x0000000000000073 x7: 0x0000000000000007
x8: 0x000000003b9aca00 x9: 0x80000030b2d7293c x10: 0x0000000019bfcc00 x11: 0x00000000112a8800
x12: 0x00000000000007fd x13: 000000000000000000 x14: 0x0000000026401000 x15: 0x0000000000000002
x16: 0x00000001a6f1a0f8 x17: 0x0000000026400000 x18: 000000000000000000 x19: 000000000000000000
x20: 000000000000000000 x21: 0x0000000283b9d260 x22: 0x0000000430e23400 x23: 000000000000000000
x24: 000000000000000000 x25: 0x000000028172f500 x26: 0x0000000282271a00 x27: 0x000000010cf2c038
x28: 000000000000000000 fp: 0x000000016ffe2660 lr: 0x00000001aa646cb8
sp: 0x000000016ffe2620 pc: 0x00000001a6f1a114 cpsr: 0x20000000
...
Thread 42 Crashed:
0 libdispatch.dylib 0x00000001a6f1a110 _dispatch_source_set_timer$VARIANT$mp + 24
1 CFNetwork 0x00000001aa646cb0 __CFNetworkSetATSContext + 86408
2 CFNetwork 0x00000001aa647140 __CFNetworkSetATSContext + 87576
3 CFNetwork 0x00000001aa644370 __CFNetworkSetATSContext + 75848
4 CFNetwork 0x00000001aa6f0810 __CFURLStorageSessionCopyCache + 60104
5 libdispatch.dylib 0x00000001a6f619a0 __dispatch_call_block_and_release + 16
6 libdispatch.dylib 0x00000001a6f62520 __dispatch_client_callout + 12
7 libdispatch.dylib 0x00000001a6f0e8a0 __dispatch_lane_serial_drain$VARIANT$mp + 604
8 libdispatch.dylib 0x00000001a6f0f2c0 __dispatch_lane_invoke$VARIANT$mp + 460
9 libdispatch.dylib 0x00000001a6f10370 __dispatch_workloop_invoke$VARIANT$mp + 1612
10 libdispatch.dylib 0x00000001a6f18780 __dispatch_workloop_worker_thread + 576
11 libsystem_pthread.dylib 0x00000001a6fb3b70 _pthread_wqthread + 268
8 libsystem_pthread.dylib 0x00000001a6fb6740 start_wqthread + 8