Michał Chojnowski
08b117425e
utils/alien_worker: fix a data race in submit()
...
We move a `seastar::promise` on the external worker thread,
after the matching `seastar::future` was returned to the shard.
That's illegal. If the `promise` move occurs concurrently with some
operation (move, await) on the `future`, it becomes a data race
which could cause various kinds of corruption.
This patch fixes that by keeping the promise at a stable address
on the shard (inside a coroutine frame) and only passing through
the worker.
Fixes #24751
Closes scylladb/scylladb#24752
(cherry picked from commit a29724479a )
Closes scylladb/scylladb#24777
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