# 2012 January 12 # # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # set testdir [file dirname $argv0] source $testdir/tester.tcl set testprefix corruptF # Do not use a codec for tests in this file, as the database file is # manipulated directly using tcl scripts (using the [hexio_write] command). # do_not_use_codec proc str {i} { format %08d $i } # Create a 6 page database containing a single table - t1. Table t1 # consists of page 2 (the root page) and pages 5 and 6 (leaf pages). # Database pages 3 and 4 are on the free list. # proc create_test_db {} { catch { db close } forcedelete test.db sqlite3 db test.db db func str str execsql { PRAGMA auto_vacuum = 0; PRAGMA page_size = 1024; CREATE TABLE t1(x); /* root page = 2 */ CREATE TABLE t2(x); /* root page = 3 */ CREATE TABLE t3(x); /* root page = 4 */ INSERT INTO t1 VALUES(str(1)); INSERT INTO t1 SELECT str(rowid+1) FROM t1; INSERT INTO t1 SELECT str(rowid+2) FROM t1; INSERT INTO t1 SELECT str(rowid+4) FROM t1; INSERT INTO t1 SELECT str(rowid+8) FROM t1; INSERT INTO t1 SELECT str(rowid+16) FROM t1; INSERT INTO t1 SELECT str(rowid+32) FROM t1; INSERT INTO t1 SELECT str(rowid+64) FROM t1; DROP TABLE t2; DROP TABLE t3; } db close } do_test 1.1 { create_test_db } {} # Check the db is as we expect. 6 pages in total, with 3 and 4 on the free # list. Page 3 is the free list trunk and page 4 is a leaf. # do_test 1.2 { file size test.db } [expr 6*1024] do_test 1.3 { hexio_read test.db 32 4 } 00000003 do_test 1.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004 # Change the free-list entry to page 6 and reopen the db file. do_test 1.5 { hexio_write test.db [expr 2*1024 + 8] 00000006 sqlite3 db test.db } {} # Now create a new table in the database file. The root of the new table # is page 6, which is also the right-most leaf page in table t1. # do_execsql_test 1.6 { CREATE TABLE t4(x); SELECT * FROM sqlite_master; } { table t1 t1 2 {CREATE TABLE t1(x)} table t4 t4 6 {CREATE TABLE t4(x)} } # At one point this was causing an assert to fail. # # This statement opens a cursor on table t1 and does a full table scan. As # each row is visited, it is copied into table t4. There is no temporary # table. # # When the t1 cursor reaches page 6 (which is both the right-most leaf of # t1 and the root of t4), it continues to iterate through the keys within # it (which at this point are keys that have been inserted into t4). And # for each row visited, another row is inserted into page 6 - it being the # root page of t4. Eventually, page 6 becomes full and the height of the # b-tree for table t4 increased. From the point of view of the t1 cursor, # this unexpectedly reduces the number of keys on page 6 in the middle of # its iteration, which causes an assert() to fail. # db_save_and_close if 1 { for {set i 0} {$i < 128} {incr i} { db_restore_and_reopen do_test 1.7.$i { set res [ catchsql { INSERT INTO t4 SELECT x FROM t1 WHERE rowid>$i } ] if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} { set res "" } set res } {} } } do_test 2.1 { create_test_db } {} do_test 2.2 { file size test.db } [expr 6*1024] do_test 2.3 { hexio_read test.db 32 4 } 00000003 do_test 2.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004 # Change the free-list entry to page 5 and reopen the db file. do_test 2.5 { hexio_write test.db [expr 2*1024 + 8] 00000005 sqlite3 db test.db } {} # Now create a new table in the database file. The root of the new table # is page 5, which is also the right-most leaf page in table t1. # do_execsql_test 2.6 { CREATE TABLE t4(x); SELECT * FROM sqlite_master; } { table t1 t1 2 {CREATE TABLE t1(x)} table t4 t4 5 {CREATE TABLE t4(x)} } db_save_and_close for {set i 127} {$i >= 0} {incr i -1} { db_restore_and_reopen do_test 2.7.$i { set res [ catchsql { INSERT INTO t4 SELECT x FROM t1 WHERE rowid<$i ORDER BY rowid DESC } ] if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} { set res "" } set res } {} } finish_test