Use a fd opened for read/write when syncing slots during startup, take 2.
Cribbing from dfbaed45975:
Some operating systems, including the reporter's windows, return EBADFD
or similar when fsync() is invoked on a O_RDONLY file descriptor.
Unfortunately RestoreSlotFromDisk() does exactly that; which causes
failures after restarts in at least some scenarios.
If you hit the bug the error message will be something like
ERROR: could not fsync file "pg_replslot/$name/state": Bad file descriptor
Simply use O_RDWR instead of O_RDONLY when opening the relevant file
descriptor to fix the bug.
Unfortunately this fix was undone in 82a5649fb9db. Re-apply, and add a
comment.
Bug: 16039
Reported-By: Hans Buschmann
Author: Andres Freund
Discussion: https://postgr.es/m/16039-196fc97cc05e141c@postgresql.org
Backpatch: 12-, as 82a5649fb9db
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/a586cc4b6c568e88a459f1a69ac82aa42af7e5ba
Modified Files
--------------
src/backend/replication/slot.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)