Ensure that a checkpoint does not use an out-of-date mapping.

FossilOrigin-Name: a1040f0397d57855500926494c978623286ddc77

1 files changed, 3 insertions, 0 deletions

diff --git a/src/wal.c b/src/wal.c
index abbd7032f..881f0a4c7 100644
--- a/src/wal.c
+++ b/src/wal.c
@@ -2956,6 +2956,9 @@ int sqlite3WalCheckpoint(
   /* Read the wal-index header. */
   if( rc==SQLITE_OK ){
     rc = walIndexReadHdr(pWal, &isChanged);
+    if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
+      sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
+    }
   }
 
   /* Copy data from the log to the database file. */