RE: Logical replication 'invalid memory alloc request size 1585837200' after upgrading to 17.5

Dear Amit, Duncan, Vignesh, Sawada-san,

I searched on GitHub and confirmed that no extensions use sizeof(ReorderBufferTXN).
Based on that, can we proceed with the fix for backbenches?
Note that I checked only repositories that are opened on GitHub. Proprietary
ones and hosting on other services cannot be guaranteed.

How I search
===========
I searched on github with "sizeof(ReorderBufferTXN)", and 259 files were found.
All of them were either "reorderbuffer.c" or "reorderbuffer.cpp". reorderbuffer.c
came from the forked postgres repos, and "reorderbuffer.cpp" came from the
openGauss project, which tries to enhance postgres. In both cases, they are
server-side code and will rebase community's commits when we update the header
file and sizeof(ReorderBufferTXN).
In this check, I could not find extensions that refer to the size; only
server-side codes were found. Based on that, we could extend the struct
ReorderBufferTXN.

[1]: https://github.com/search?q=sizeof%28ReorderBufferTXN%29&type=code
[2]: https://github.com/opengauss-mirror/openGauss-server/blob/master/src/gausskernel/storage/replication/logical/reorderbuffer.cpp

Best regards,
Hayato Kuroda
FUJITSU LIMITED