Hi, Thanks for the report! I can reproduce this bug on master and your patch fixes it.
> I've attached a patch which registers an on_shmem_exit() callback > to close the file descriptors on server exit. I took inspiration > from how src/backend/storage/aio/method_worker.c handles cleanup. I also verify that only the postmaster will call this callback because all children of the postmaster will reset postmaster's callback. My another thought is that add a shmem_cleanup callback to IoMethodOps and do cleanup in this callback. Not sure which is better. -- Regards, ChangAo Chen
