Fix an pcache memory leak that might occur due to the munmap() enhancement

of [754f331614f6f6e6] if "PRAGMA shrink_memory" is used.

FossilOrigin-Name: f8c1f9c44bb3da7856690ac04c1de1fb8b7e3ccc32141bf414cd85bd90644a30

manifest

@@ -1,5 +1,5 @@
-C Merge\sthe\slatest\strunk\senhancements\sinto\sthe\sbedrock\sbranch.
-D 2023-02-07T11:39:47.869
+C Fix\san\spcache\smemory\sleak\sthat\smight\soccur\sdue\sto\sthe\smunmap()\senhancement\nof\s[754f331614f6f6e6]\sif\s"PRAGMA\sshrink_memory"\sis\sused.
+D 2023-02-07T16:23:00.173
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -621,7 +621,7 @@ F src/pager.h 3ddab454e313da7c93f92fea35c842ad17ae9f4e96254871ddb0171b2bfb859a
 F src/parse.y 17c50d262d92083badeb60b3ebe4725e19c76548f90aea898ab07d4f2940a7d8
 F src/pcache.c f4268f7f73c6a3db12ce22fd25bc68dc42315d19599414ab1207d7cf32f79197
 F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
-F src/pcache1.c 9f51e80b6d55bc7b62e6260cfe2c06e0a541b4138de9f889c5a55f6c1a922327
+F src/pcache1.c f3d06b0c1bd400cf657095757d427b149f6c1788e9447b2ce019988a5344ede8
 F src/pragma.c bcd8519da83da8023fd340f71cddfca33805d332e89b55cc974285f146e42e76
 F src/pragma.h 1f421360eed1a7721e8c521463df8519a7c8d0d5893ebd9dbfe0dba8de996f8c
 F src/prepare.c ce87a08cfddd45a147150db34190b1986f2d4a0e0828858cb6bd908c78fb02e3
@@ -2081,8 +2081,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 754f331614f6f6e630876bf23c7da84a8408c764540983c0182271268177c00b 2537db6f6b9df00913b57e2ad0e4deef2040ce47b28f9a9939f42c0443d70ac9
-R a4310148346f618eaea8e89240915fa8
+P b7d9f14d78a52f87fcc7bc1d3e9f00d6ce1d648b1b244bc3989d7308f52063a0
+R 01c5f59ba9109ba76cbb949c3f19564e
 U drh
-Z eaffc988d4d81b2ebed4b12c6d29244d
+Z 323ecce8708401861de806d60c76fa96
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-b7d9f14d78a52f87fcc7bc1d3e9f00d6ce1d648b1b244bc3989d7308f52063a0
+f8c1f9c44bb3da7856690ac04c1de1fb8b7e3ccc32141bf414cd85bd90644a30

src/pcache1.c

@@ -631,6 +631,14 @@ static void pcache1EnforceMaxPage(PCache1 *pCache){
     pcache1RemoveFromHash(p, 1);
   }
   if( pCache->nPage==0 && pCache->pBulk ){
+    if( pcache1.separateCache ){
+      PgHdr1 *p1 = pCache->pFree;
+      while( p1 ){
+        PgHdr1 *pNext = p1->pNext;
+        if( p1->isBulkLocal==0 ) pcache1Free(p1->page.pBuf);
+        p1 = pNext;
+      }
+    }
     sqlite3_free(pCache->pBulk);
     pCache->pBulk = pCache->pFree = 0;
   }
@@ -1187,6 +1195,7 @@ static void pcache1Destroy(sqlite3_pcache *p){
       if( p1->isBulkLocal==0 ) pcache1Free(p1->page.pBuf);
       p1 = pNext;
     }
+    pCache->pFree = 0;
   }
   assert( pGroup->nMaxPage >= pCache->nMax );
   pGroup->nMaxPage -= pCache->nMax;