Aleksandra Martyniuk 9b9ea1193c tasks: keep task's children in list ...

If std::vector is resized its iterators and references may
get invalidated. While task_manager::task::impl::_children's
iterators are avoided throughout the code, references to its
elements are being used.

Since children vector does not need random access to its
elements, change its type to std::list<foreign_task_ptr>, which
iterators and references aren't invalidated on element insertion.

Fixes: #16380.

Closes scylladb/scylladb#16381

2023-12-13 10:47:27 +02:00

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