This is xnu-11215.1.10. See this file in:
Directory listing for xnu-11215.1.10//tests/ipc
hardened_exceptions.c
immovable_rights.c
ipc_read_inspect.c
ipc_thread_ports_race.c
kernel_signed_pac_thread_state.c
mach_exc_port_substitute.c
mach_exc_port_substitute.plist
mach_msg2.c
mach_msg_transport.c
port_api.c
port_notification_99449706.c
port_peek.c
port_turnstile_stash.c
sys_perf_notify_test.c
task_dyld_process_info_notify.c
task_name_for_pid.c
task_name_for_pid_entitlement.plist
waitq.c