Dear Fujii-san, Thanks for pushing and analyzing the failure!
> The regression.diffs shows that pgfdw_conn_check returned 0 even though > pgfdw_conn_checkable() > returned true. This can happen if the "revents" from poll() indicates > something > other than > POLLRDHUP. I think that "revents" could indicate POLLHUP, POLLERR, or > POLLNVAL. Therefore, > IMO pgfdw_conn_check() should be updated as follows. I will test this change. > > - return (input_fd.revents & POLLRDHUP) ? 1 : 0; > + return (input_fd.revents & > + (POLLRDHUP | POLLHUP | POLLERR | > POLLNVAL)) ? 1 : 0; I think you are right. According to the man page, the input socket is invalid or disconnected if revents has such bits. So such cases should be also regarded as *failure*. After the fix, the animal said OK. Great works! Best regards, Hayato Kuroda FUJITSU LIMITED
