From 11095bcb89a2386698743b948387bf46611b0d8f Mon Sep 17 00:00:00 2001
From: drh <>
Date: Tue, 17 Oct 2023 10:47:42 +0000
Subject: [PATCH] When an I/O or similar error occurs during a transaction with
 journal_mode=MEMORY, attempt to rollback before closing the journal, as all
 rollback information is forgotten when a memory rollback journal is closed.

FossilOrigin-Name: 1d67f75de259e5a26b751a50432822a268ebe367cda6510891ab81a15e5daa1c
---
 manifest      | 14 +++++++-------
 manifest.uuid |  2 +-
 src/pager.c   | 32 +++++++++++++++++++++++++++++++-
 3 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/manifest b/manifest
index 95bba15b39..0bb8ce077d 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Harden\sAPI_ARMOR\schecks\sfor\ssqlite3_stmt_scanstatus_v2().
-D 2023-10-17T02:15:49.601
+C When\san\sI/O\sor\ssimilar\serror\soccurs\sduring\sa\stransaction\swith\njournal_mode=MEMORY,\sattempt\sto\srollback\sbefore\sclosing\sthe\sjournal,\sas\nall\srollback\sinformation\sis\sforgotten\swhen\sa\smemory\srollback\sjournal\sis\nclosed.
+D 2023-10-17T10:47:42.224
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -705,7 +705,7 @@ F src/os_setup.h 6011ad7af5db4e05155f385eb3a9b4470688de6f65d6166b8956e58a3d87210
 F src/os_unix.c 2e8b12107f75d1bd16412f312b4c5d5103191807a37836d3b81beb26436ad81b
 F src/os_win.c 4a50a154aeebc66a1f8fb79c1ff6dd5fe3d005556533361e0d460d41cb6a45a8
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
-F src/pager.c 4aa388e47138551c83ae265e2efd4e01f0aa5afb6a958f45579658847b3430ff
+F src/pager.c 2188897e1102a776dcb1bbe8b2eb70ac7de8863c9cb95ef09d35e9bad406cf45
 F src/pager.h f4d33fec8052603758792045493423b8871a996da2d0973927b7d36cd6070473
 F src/parse.y aeb7760d41cfa86465e3adba506500c021597049fd55f82a30e5b7045862c28c
 F src/pcache.c 040b165f30622a21b7a9a77c6f2e4877a32fb7f22d4c7f0d2a6fa6833a156a75
@@ -2132,8 +2132,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 15b28b340a5c5efdbfe3fbed16ee0b699561edaeebb77446addf2374bdf9357e
-R 6b89fd1d08788235ad034998751967c3
-U stephan
-Z f2c535ed4796a207a0fd6c4ff4bf7413
+P d3f38e813ba3b887e973af034713cd58fdfbe07da375b154accc7b5790cfaeda
+R b56a9057afb3315b9dbeaacc1714889d
+U drh
+Z 10639baf7980722d71051df0aed0a0d8
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index e3467df406..4d645149e5 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-d3f38e813ba3b887e973af034713cd58fdfbe07da375b154accc7b5790cfaeda
\ No newline at end of file
+1d67f75de259e5a26b751a50432822a268ebe367cda6510891ab81a15e5daa1c
\ No newline at end of file
diff --git a/src/pager.c b/src/pager.c
index 1423b66541..5c2d556b3e 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -2161,6 +2161,9 @@ static int pager_end_transaction(Pager *pPager, int hasSuper, int bCommit){
   return (rc==SQLITE_OK?rc2:rc);
 }
 
+/* Forward reference */
+static int pager_playback(Pager *pPager, int isHot);
+
 /*
 ** Execute a rollback if a transaction is active and unlock the
 ** database file.
@@ -2189,6 +2192,21 @@ static void pagerUnlockAndRollback(Pager *pPager){
       assert( pPager->eState==PAGER_READER );
       pager_end_transaction(pPager, 0, 0);
     }
+  }else if( pPager->eState==PAGER_ERROR
+         && pPager->journalMode==PAGER_JOURNALMODE_MEMORY
+         && isOpen(pPager->jfd)
+  ){
+    /* Special case for a ROLLBACK due to I/O error with an in-memory
+    ** journal:  We have to rollback immediately, before the journal is
+    ** closed, because once it is closed, all content is forgotten. */
+    int errCode = pPager->errCode;
+    u8 eLock = pPager->eLock;
+    pPager->eState = PAGER_OPEN;
+    pPager->errCode = SQLITE_OK;
+    pPager->eLock = EXCLUSIVE_LOCK;
+    pager_playback(pPager, 1);
+    pPager->errCode = errCode;
+    pPager->eLock = eLock;
   }
   pager_unlock(pPager);
 }
@@ -5681,8 +5699,20 @@ int sqlite3PagerGet(
   DbPage **ppPage,    /* Write a pointer to the page here */
   int flags           /* PAGER_GET_XXX flags */
 ){
-  /* printf("PAGE %u\n", pgno); fflush(stdout); */
+#if 0   /* Trace page fetch by setting to 1 */
+  int rc;
+  printf("PAGE %u\n", pgno);
+  fflush(stdout);
+  rc = pPager->xGet(pPager, pgno, ppPage, flags);
+  if( rc ){ 
+    printf("PAGE %u failed with 0x%02x\n", pgno, rc);
+    fflush(stdout);
+  }
+  return rc;
+#else
+  /* Normal, high-speed version of sqlite3PagerGet() */
   return pPager->xGet(pPager, pgno, ppPage, flags);
+#endif
 }
 
 /*