Fix infinite wait when reading a partially written WAL record

If a crash occurs while writing a WAL record that spans multiple pages, the
recovery process marks the page with the XLP_FIRST_IS_OVERWRITE_CONTRECORD
flag.  However, logical decoding currently attempts to read the full WAL
record based on its expected size before checking this flag, which can lead
to an infinite wait if the remaining data is never written (e.g., no activity
after crash).

This patch updates the logic first to read the page header and check for
the XLP_FIRST_IS_OVERWRITE_CONTRECORD flag before attempting to reconstruct
the full WAL record.  If the flag is set, decoding correctly identifies
the record as incomplete and avoids waiting for WAL data that will never
arrive.

Discussion: https://postgr.es/m/CAAKRu_ZCOzQpEumLFgG_%2Biw3FTa%2BhJ4SRpxzaQBYxxM_ZAzWcA%40mail.gmail.com
Discussion: https://postgr.es/m/CALDaNm34m36PDHzsU_GdcNXU0gLTfFY5rzh9GSQv%3Dw6B%2BQVNRQ%40mail.gmail.com
Author: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Backpatch-through: 13

src/backend/access/transam/xlogreader.c

@@ -723,11 +723,12 @@ restart:
 			/* Calculate pointer to beginning of next page */
 			targetPagePtr += XLOG_BLCKSZ;
 
-			/* Wait for the next page to become available */
-			readOff = ReadPageInternal(state, targetPagePtr,
-									   Min(total_len - gotlen + SizeOfXLogShortPHD,
-										   XLOG_BLCKSZ));
-
+			/*
+			 * Read the page header before processing the record data, so we
+			 * can handle the case where the previous record ended as being a
+			 * partial one.
+			 */
+			readOff = ReadPageInternal(state, targetPagePtr, SizeOfXLogShortPHD);
 			if (readOff == XLREAD_WOULDBLOCK)
 				return XLREAD_WOULDBLOCK;
 			else if (readOff < 0)
@@ -776,6 +777,15 @@ restart:
 				goto err;
 			}
 
+			/* Wait for the next page to become available */
+			readOff = ReadPageInternal(state, targetPagePtr,
+									   Min(total_len - gotlen + SizeOfXLogShortPHD,
+										   XLOG_BLCKSZ));
+			if (readOff == XLREAD_WOULDBLOCK)
+				return XLREAD_WOULDBLOCK;
+			else if (readOff < 0)
+				goto err;
+
 			/* Append the continuation from this page to the buffer */
 			pageHeaderSize = XLogPageHeaderSize(pageHeader);