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+
+# 2007 Aug 13
+#
+# 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.
+#
+#***********************************************************************
+#
+# This file tests aspects of recovery from a malloc() failure
+# in a CREATE INDEX statement.
+#
+# $Id: crash5.test,v 1.3 2008/07/12 14:52:20 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Only run these tests if memory debugging is turned on.
+#
+ifcapable !crashtest||!memorymanage {
+ puts "Skipping crash5 tests: not compiled with -DSQLITE_ENABLE_MEMORY_MANAGEMENT..."
+ finish_test
+ return
+}
+
+db close
+
+for {set ii 0} {$ii < 10} {incr ii} {
+ for {set jj 1} {$jj < 100} {incr jj} {
+
+ # Set up the database so that it is an auto-vacuum database
+ # containing a single table (root page 3) with a single row.
+ # The row has an overflow page (page 4).
+ forcedelete test.db test.db-journal
+ sqlite3 db test.db
+ set c [string repeat 3 1500]
+ db eval {
+ pragma auto_vacuum = 1;
+ CREATE TABLE t1(a, b, c);
+ INSERT INTO t1 VALUES('1111111111', '2222222222', $c);
+ }
+ db close
+
+ do_test crash5-$ii.$jj.1 {
+ crashsql -delay 1 -file test.db-journal -seed $ii -tclbody [join [list \
+ [list set iFail $jj] {
+ proc get_pwd {} {
+ if {$::tcl_platform(platform) eq "windows"} {
+ if {[info exists ::env(ComSpec)]} {
+ set comSpec $::env(ComSpec)
+ } else {
+ # NOTE: Hard-code the typical default value.
+ set comSpec {C:\Windows\system32\cmd.exe}
+ }
+ return [string map [list \\ /] \
+ [string trim [exec -- $comSpec /c echo %CD%]]]
+ } else {
+ return [pwd]
+ }
+ }
+ sqlite3_crashparams 0 [file join [get_pwd] test.db-journal]
+
+ # Begin a transaction and evaluate a "CREATE INDEX" statement
+ # with the iFail'th malloc() set to fail. This operation will
+ # have to move the current contents of page 4 (the overflow
+ # page) to make room for the new root page. The bug is that
+ # if malloc() fails at a particular point in sqlite3PagerMovepage(),
+ # sqlite mistakenly thinks that the page being moved (page 4) has
+ # been safely synced into the journal. If the page is written
+ # to later in the transaction, it may be written out to the database
+ # before the relevant part of the journal has been synced.
+ #
+ db eval BEGIN
+ sqlite3_memdebug_fail $iFail -repeat 0
+ set rc [catch {db eval { CREATE UNIQUE INDEX i1 ON t1(a); }} msg]
+# puts "$msg ac=[sqlite3_get_autocommit db] iFail=$iFail"
+# puts "fail=[sqlite3_memdebug_fail -1]"
+
+ if {$rc} {
+ # If the transaction is still active (it may not be if the malloc()
+ # failure occurred in the OS layer), write to the database. Make sure
+ # page 4 is among those written.
+ #
+ if {![sqlite3_get_autocommit db]} {
+ db eval {
+ DELETE FROM t1; -- This will put page 4 on the free list.
+ INSERT INTO t1 VALUES('111111111', '2222222222', '33333333');
+ INSERT INTO t1 SELECT * FROM t1; -- 2
+ INSERT INTO t1 SELECT * FROM t1; -- 4
+ INSERT INTO t1 SELECT * FROM t1; -- 8
+ INSERT INTO t1 SELECT * FROM t1; -- 16
+ INSERT INTO t1 SELECT * FROM t1; -- 32
+ INSERT INTO t1 SELECT * FROM t1 WHERE rowid%2; -- 48
+ }
+ }
+
+ # If the right malloc() failed during the 'CREATE INDEX' above and
+ # the transaction was not rolled back, then the sqlite cache now
+ # has a dirty page 4 that it incorrectly believes is already safely
+ # in the synced part of the journal file. When
+ # sqlite3_release_memory() is called sqlite tries to free memory
+ # by writing page 4 out to the db file. If it crashes later on,
+ # before syncing the journal... Corruption!
+ #
+ sqlite3_crashparams 1 [file join [get_pwd] test.db-journal]
+ sqlite3_release_memory 8092
+ }
+ }]] {}
+ expr 1
+ } {1}
+
+ sqlite3 db test.db
+ do_test crash5-$ii.$jj.2 {
+ db eval {pragma integrity_check}
+ } {ok}
+ do_test crash5-$ii.$jj.3 {
+ db eval {SELECT * FROM t1}
+ } [list 1111111111 2222222222 $::c]
+ db close
+ }
+}
+
+
+finish_test