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## Problem See https://neondb.slack.com/archives/C033A2WE6BZ/p1729007738526309?thread_ts=1722942856.987979&cid=C033A2WE6BZ When replica receives WAL record which target page is not present in shared buffer, we evict this page from LFC. If all pages from the LFC chunk are evicted, then chunk is moved to the beginning of LRU least to force it reuse. Unfortunately access_count is not checked and if the entry is access at this moment then this operation can cause LRU list corruption. ## Summary of changes Check `access_count` in `lfc_evict` ## Checklist before requesting a review - [ ] I have performed a self-review of my code. - [ ] If it is a core feature, I have added thorough tests. - [ ] Do we need to implement analytics? if so did you add the relevant metrics to the dashboard? - [ ] If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section. ## Checklist before merging - [ ] Do not forget to reformat commit message to not include the above checklist Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>