The same crash occurred on another iPhone:
iOS 15.6.0
iPhone 7
com.apple.CFNetwork.LoaderQ
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000058
Crashed: com.apple.CFNetwork.LoaderQ
0 libdispatch.dylib 0x17424 dispatch_source_set_timer$VARIANT$mp + 28
1 CFNetwork 0x1f6a8 CFURLRequestSetMainDocumentURL + 1508
2 CFNetwork 0x1b7d8c _CFNetworkErrorGetLocalizedDescription + 642092
3 CFNetwork 0x20adc CFURLRequestSetMainDocumentURL + 6680
4 CFNetwork 0x17404 CFURLRequestSetURL + 8296
5 libdispatch.dylib 0x63094 _dispatch_call_block_and_release + 24
6 libdispatch.dylib 0x64094 _dispatch_client_callout + 16
7 libdispatch.dylib 0xa73c _dispatch_lane_serial_drain$VARIANT$mp + 644
8 libdispatch.dylib 0xb224 _dispatch_lane_invoke$VARIANT$mp + 456
9 libdispatch.dylib 0xc398 _dispatch_workloop_invoke$VARIANT$mp + 1692
10 libdispatch.dylib 0x14ec8 _dispatch_workloop_worker_thread + 632
11 libsystem_pthread.dylib 0x1e10 _pthread_wqthread + 284
12 libsystem_pthread.dylib 0x193c start_wqthread + 8