https://bugs.openldap.org/show_bug.cgi?id=9496

--- Comment #8 from opensou...@gmx-topmail.de <opensou...@gmx-topmail.de> ---
After applying this patch, I observed some conditions in which MDB_PREVSNAPSHOT
does not work anymore: instead of the previous commit, the current commit is
taken.

While the exact conditions when this happens is not 100% clear, these are the
observations:

- Having the DB on a RAM disk has impact. On macOS, we observed that it is
always reproducible for one of our test case (straight forward test for
MDB_PREVSNAPSHOT but too much context required to share here). RAM disk was
created like that:
diskutil partitionDisk $(hdiutil attach -nomount ram://2048000) 1 GPTFormat
APFS 'ramdisk' '100%'

- When building with thread sanitizer the issue was also observed on Linux. It
was reproducible in about half of the runs (flaky).

- It happened also in regular builds, but very infrequent.

I'm sorry that I cannot dig deeper at this moment and e.g. provide a patch.
Still wanted to put these observations down in the hope that they might be
useful for someone.

Best, Markus

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