Upon event timer expiry, the timer adapter will cause the timer struct to be used after its freed.

rte_event_timer_adapter.c:sw_event_timer_cb() calls rte_mempool_put(), returning the internal timer-related data, including a rte_timer instance, to the pool.

rte_timer_manage() updates fields of the rte_timer struct *after* the expiry call back has finished.

Timers armed on a different core may retrieve this timer struct from the pool, resulting in a data race.