From 03385305443bbf1ae3c32b76bdfbedfd7ec05ae9 Mon Sep 17 00:00:00 2001
From: Minglei Jin <mljin@taosdata.com>
Date: Fri, 19 Aug 2022 19:40:21 +0800
Subject: [PATCH] fix: wait pPageH to complete initialization

---
 source/libs/tdb/src/db/tdbPCache.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/source/libs/tdb/src/db/tdbPCache.c b/source/libs/tdb/src/db/tdbPCache.c
index 22229ea0e8..ab9b21dc3f 100644
--- a/source/libs/tdb/src/db/tdbPCache.c
+++ b/source/libs/tdb/src/db/tdbPCache.c
@@ -199,10 +199,20 @@ static SPage *tdbPCacheFetchImpl(SPCache *pCache, const SPgid *pPgid, TXN *pTxn)
     if (pPageH) {
       // copy the page content
       memcpy(&(pPage->pgid), pPgid, sizeof(*pPgid));
+
+      for (int nLoops = 0;;) {
+        if (pPageH->pPager) break;
+        if (++nLoops > 1000) {
+          sched_yield();
+          nLoops = 0;
+        }
+      }
+
       pPage->pLruNext = NULL;
       pPage->pPager = pPageH->pPager;
 
       memcpy(pPage->pData, pPageH->pData, pPage->pageSize);
+      tdbDebug("pcache/pPageH: %p %d %p %p", pPageH, pPageH->pPageHdr - pPageH->pData, pPageH->xCellSize, pPage);
       tdbPageInit(pPage, pPageH->pPageHdr - pPageH->pData, pPageH->xCellSize);
       pPage->kLen = pPageH->kLen;
       pPage->vLen = pPageH->vLen;
-- 
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