Report any XLogReadRecord() error in XlogReadTwoPhaseData().
Buildfarm members kittiwake and tadarida have witnessed errors at this
site.  The site discarded key facts.  Back-patch to v10 (all supported
versions).
Discussion:
@@ -1465,11 +1465,21 @@ XlogReadTwoPhaseData(XLogRecPtr lsn, char **buf, int *len)
ThisTimeLineID = save_currtli;
if (record == NULL)
+ {
+ if (errormsg)
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not read two-phase state from WAL at %X/%X: %s",
+ (uint32) (lsn >> 32),
+ (uint32) lsn,
+ errormsg)));
+ else
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not read two-phase state from WAL at %X/%X",
(uint32) (lsn >> 32),
(uint32) lsn)));
+ }
if (XLogRecGetRmid(xlogreader) != RM_XACT_ID ||
(XLogRecGetInfo(xlogreader) & XLOG_XACT_OPMASK) != XLOG_XACT_PREPARE)
