[LU-13049] LNet: Handle shutdown properly

Related — Thu, 20 Oct 2022 14:22:26 +0000

There are two code paths which can lookup a peer while the system is shutting down:

net_shutdown_lndnet()>lnet_peer_tables_cleanup()>lnet_peer_table_del_rtrs_locked()->lnet_del_route()
lnet_mt_event_handler()>lnet_handle_recovery_reply()>lnet_find_peer_ni_locked()

In both of these cases the_lnet.ln_state might be shutting down. Currently lnet_get_peer_ni_locked() asserts on ln_stat == LNET_STATE_RUNNING.

This should be handled gracefully. If the state isn't running, then it should return NULL. Callers of the function handle NULL return code.

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