MI - WAL issue

Hi team,

I need some urgent assistance.

We're running *PostgreSQL 17.6*, and the application team has reported
an *export
issue*. While investigating, I found the following messages in the
PostgreSQL logs:

2026-07-26 10:58:52.902 MST [1183899] DETAIL: Parameters: $1 =
'1785088732902', $2 = 'ctsserver-11783137027378'
2026-07-26 10:58:56.136 MST [1529364] LOG: checkpoint starting: time
2026-07-26 10:58:56.447 MST [1529364] LOG: request to flush past end
of generated WAL; request 5D116/1, current position C8F/734E66C0
2026-07-26 10:58:56.447 MST [1529364] CONTEXT: writing block 4400857
of relation base/16384/1255337
2026-07-26 10:58:56.448 MST [1529364] ERROR: xlog flush request
5D116/1 is not satisfied --- flushed only to C8F/734E66C0
2026-07-26 10:58:56.448 MST [1529364] CONTEXT: writing block 4400857
of relation base/16384/1255337

Has anyone come across this issue before or know what could cause it? Any
guidance on the root cause or recommended troubleshooting steps would be
greatly appreciated.

This is a *Major Incident (MI)* and requires immediate assistance.

Thanks in advance.