Andres Freund <andres@xxxxxxxxxxx> writes: > I suspect that's because WSL has an empty implementation of > sync_file_range(), i.e. it unconditionally returns ENOSYS. But as > configure detects it, we still emit calls for it. I guess we ought to > except ENOSYS for the cases where we do panic-on-fsync-failure? I'm of the opinion that we shouldn't be panicking for sync_file_range failure, period. regards, tom lane