Re: VM corruption on standby

Andrey Borodin <x4mmm@yandex-team.ru>

From: Andrey Borodin <x4mmm@yandex-team.ru>

To: Aleksander Alekseev <aleksander@tigerdata.com>

Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Melanie Plageman <melanieplageman@gmail.com>

Date: 2025-08-10T06:56:28Z

Lists: pgsql-hackers

> On 9 Aug 2025, at 23:54, Aleksander Alekseev <aleksander@tigerdata.com> wrote:
> 
> IMHO: logging the changes first, then allowing to evict the page.

VM and BufferManager code does not allow flush of a buffer until changes are logged.
The problem is that our crash-exiting system destroys locks that protect buffer from being flushed.

Best regards, Andrey Borodin.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Revert "Get rid of WALBufMappingLock"
- 2ce6abdf5085 18.0 landed
- c13070a27b63 19 (unreleased) landed
Get rid of WALBufMappingLock
- bc22dc0e0ddc 18.0 cited
Split WaitEventSet functions to separate source file
- 393e0d231405 18.0 cited
Add WL_EXIT_ON_PM_DEATH pseudo-event.
- cfdf4dc4fc96 12.0 cited