In commit 11a8912093 (gossiper:
get_gossip_status: return string_view and make noexcept)
get_gossip_status returns a pointer to an endpoint_state in
endpoint_state_map.
After commit 425e3b1182 (gossip: Introduce
direct failure detector), gossiper::mark_dead and gossiper::real_mark_alive
can yield in the middle of the function. It is possible that
endpoint_state can be removed, causing use-after-free to access it.
To fix, make a copy before we yield.
Fixes#8859Closes#8862
7a32cab524