Re: Why clearing the VM doesn't require registering vm buffer in wal record - Mailing list pgsql-hackers

Hi Melanie,

On 24 Sep 2026, Melanie Plageman wrote:
> v2-0001 is 19-only and fixes the divergent VM bits on the standby

The UPDATE fallback from v1 is missing in both versions of 0001.
heap_xlog_update() handles VM_OLD/VM_NEW itself, without calling
heap_xlog_vm_clear(), so an unregistered VM page is still skipped.

I reproduced this with UPDATE in your CREATE DATABASE/failover scenario
on master. Could we add the fallback there too?

Separately, Shihao's v3 [0] adds PageInit() fix on top of your 0002.

Thank you!


Best regards, Andrey Borodin.

[0] https://www.postgresql.org/message-id/CAGRkXqSZXoazu1x48pz2SuW_xHYQDdRcbp2HNCfRNm_WLF8aYA%40mail.gmail.com