From e3994f2975287b459692d8a347f3f33fffa08bda Mon Sep 17 00:00:00 2001
From: drh <>
Date: Wed, 2 Mar 2022 11:39:11 +0000
Subject: [PATCH] The optimization at [ece326db50201937] is not quite right, so
 back it out for now.

FossilOrigin-Name: b218a4b9fe44ffc5cb8d2a2491a5aad217d37b26ccc6b04caf8f28b71bcfe809
---
 manifest      | 13 +++++++------
 manifest.uuid |  2 +-
 src/pager.c   |  7 ++++---
 3 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/manifest b/manifest
index 1925c433f7..c33545bdf8 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\sharmless\scompiler\swarning.
-D 2022-03-02T01:02:16.787
+C The\soptimization\sat\s[ece326db50201937]\sis\snot\squite\sright,\sso\sback\sit\sout\nfor\snow.
+D 2022-03-02T11:39:11.573
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -539,7 +539,7 @@ F src/os_setup.h 0dbaea40a7d36bf311613d31342e0b99e2536586
 F src/os_unix.c f5ad51cfd024116db8531feab9efd831c2621436dca1464e4ff1e8af9bf3252e
 F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
-F src/pager.c 1c415888b3658513c26a79b6a61989ca6463d3770102e6c24372fd7235022b02
+F src/pager.c 42120492784fc9bcd9082b5c9b5e329b7318c357f9f3574a1bbfcf7418910356
 F src/pager.h f82e9844166e1585f5786837ddc7709966138ced17f568c16af7ccf946c2baa3
 F src/parse.y 0f02b27cdaa334441463153fff3ceb780fea006ab53ffd6ef566d4468f93e924
 F src/pcache.c 0aab73936341fad83d107cf62c6a7bc2d2d5fb9aaec8c3ce61e19fc18e4560fc
@@ -1944,8 +1944,9 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 15f73b121cacf77ada02bfe434f9caa1175ac482d007156cfb0864e4221490d1
-R 92cb4b3e8b72c08af06d80ae9f960ec3
+P 6497997aa80419688890ed5dbbb7d6acc26bf3732305ff4a728cba1fe4d1626b
+Q -ece326db50201937eb688809df39edc7fb97413b4614d2e2e783418192f7b02a
+R 6e3d2a70dcfbb60b44acaa137825df92
 U drh
-Z f78232375c28b78519d89054564af79f
+Z 2c1c2df4762c35de9490f72bfde9d5c8
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index d12eabcabf..8f223b6ba7 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-6497997aa80419688890ed5dbbb7d6acc26bf3732305ff4a728cba1fe4d1626b
\ No newline at end of file
+b218a4b9fe44ffc5cb8d2a2491a5aad217d37b26ccc6b04caf8f28b71bcfe809
\ No newline at end of file
diff --git a/src/pager.c b/src/pager.c
index 33ed31d7ad..b6a0cdfca8 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -5494,6 +5494,7 @@ static int getPageNormal(
   assert( assert_pager_state(pPager) );
   assert( pPager->hasHeldSharedLock==1 );
 
+  if( pgno==0 ) return SQLITE_CORRUPT_BKPT;
   pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);
   if( pBase==0 ){
     pPg = 0;
@@ -5521,10 +5522,10 @@ static int getPageNormal(
     /* The pager cache has created a new page. Its content needs to 
     ** be initialized. But first some error checks:
     **
-    ** (1) Never try to fetch the locking page
-    ** (2) Never try to fetch page 0, which does not exist
+    ** (*) obsolete.  Was: maximum page number is 2^31
+    ** (2) Never try to fetch the locking page
     */
-    if( pgno==PAGER_SJ_PGNO(pPager) || pgno==0 ){
+    if( pgno==PAGER_SJ_PGNO(pPager) ){
       rc = SQLITE_CORRUPT_BKPT;
       goto pager_acquire_err;
     }