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Commit 18e042f5 authored by Georgiy Lebedev's avatar Georgiy Lebedev Committed by Aleksandr Lyapunov
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memtx: fix 'use after free' of garbage collected MVCC stories 

`directly_replaced` stories can potentially get garbage collected in
`memtx_tx_handle_gap_write`, which is unexpected and leads to 'use after
free': in order to fix this, limit garbage collection points only to
external API calls.

Wrap all possible garbage collection points with explicit warnings (see
c9981a56).

Closes #7449

NO_DOC=bugfix
parent c294a929
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