Chris Down
f4f1956d42
oomd_cgroup_kill_mark() allocates a temporary OomdKillState and inserts it into kill_states via set_ensure_put(). This is keyed by cgroup path. When the same cgroup is already queued, set_ensure_put() dutifully returns 0. The function then returns with _cleanup_(oomd_kill_state_removep) still armed, which eventually calls oomd_kill_state_free(). oomd_kill_state_free() removes from kill_states by cgroup-path key, so because this path already exists, it will remove the existing queued kill state instead of just dropping the temporary object. This is wrong and results in mistakenly drops the queued kill state on duplicates. This can happen when a cgroup is marked multiple times before the first queued kill state is consumed. The result is lost kill-state tracking and incorrect prekill/kill sequencing. Handle r == 0 explicitly by freeing only the temporary object and leaving the already queued state intact.
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