# 2005 November 30
#
# 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 contains tests to ensure that the library handles malloc() failures
# correctly. The emphasis of these tests are the _prepare(), _step() and
# _finalize() calls.
#
# $Id: malloc3.test,v 1.24 2008/10/14 15:54:08 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl
# Only run these tests if memory debugging is turned on.
#
if {!$MEMDEBUG} {
puts "Skipping malloc3 tests: not compiled with -DSQLITE_MEMDEBUG..."
finish_test
return
}
# Do not run these tests with an in-memory journal.
#
# In the pager layer, if an IO or OOM error occurs during a ROLLBACK, or
# when flushing a page to disk due to cache-stress, the pager enters an
# "error state". The only way out of the error state is to unlock the
# database file and end the transaction, leaving whatever journal and
# database files happen to be on disk in place. The next time the current
# (or any other) connection opens a read transaction, hot-journal rollback
# is performed if necessary.
#
# Of course, this doesn't work with an in-memory journal.
#
if {[permutation]=="inmemory_journal"} {
finish_test
return
}
#--------------------------------------------------------------------------
# NOTES ON RECOVERING FROM A MALLOC FAILURE
#
# The tests in this file test the behaviours described in the following
# paragraphs. These tests test the behaviour of the system when malloc() fails
# inside of a call to _prepare(), _step(), _finalize() or _reset(). The
# handling of malloc() failures within ancillary procedures is tested
# elsewhere.
#
# Overview:
#
# Executing a statement is done in three stages (prepare, step and finalize). A
# malloc() failure may occur within any stage. If a memory allocation fails
# during statement preparation, no statement handle is returned. From the users
# point of view the system state is as if _prepare() had never been called.
#
# If the memory allocation fails during the _step() or _finalize() calls, then
# the database may be left in one of two states (after finalize() has been
# called):
#
# * As if the neither _step() nor _finalize() had ever been called on
# the statement handle (i.e. any changes made by the statement are
# rolled back).
# * The current transaction may be rolled back. In this case a hot-journal
# may or may not actually be present in the filesystem.
#
# The caller can tell the difference between these two scenarios by invoking
# _get_autocommit().
#
#
# Handling of sqlite3_reset():
#
# If a malloc() fails while executing an sqlite3_reset() call, this is handled
# in the same way as a failure within _finalize(). The statement handle
# is not deleted and must be passed to _finalize() for resource deallocation.
# Attempting to _step() or _reset() the statement after a failed _reset() will
# always return SQLITE_NOMEM.
#
#
# Other active SQL statements:
#
# The effect of a malloc failure on concurrently executing SQL statements,
# particularly when the statement is executing with READ_UNCOMMITTED set and
# the malloc() failure mandates statement rollback only. Currently, if
# transaction rollback is required, all other vdbe's are aborted.
#
# Non-transient mallocs in btree.c:
# * The Btree structure itself
# * Each BtCursor structure
#
# Mallocs in pager.c:
# readMasterJournal() - Space to read the master journal name
# pager_delmaster() - Space for the entire master journal file
#
# sqlite3pager_open() - The pager structure itself
# sqlite3_pagerget() - Space for a new page
# pager_open_journal() - Pager.aInJournal[] bitmap
# sqlite3pager_write() - For in-memory databases only: history page and
# statement history page.
# pager_stmt_begin() - Pager.aInStmt[] bitmap
#
# None of the above are a huge problem. The most troublesome failures are the
# transient malloc() calls in btree.c, which can occur during the tree-balance
# operation. This means the tree being balanced will be internally inconsistent
# after the malloc() fails. To avoid the corrupt tree being read by a
# READ_UNCOMMITTED query, we have to make sure the transaction or statement
# rollback occurs before sqlite3_step() returns, not during a subsequent
# sqlite3_finalize().
#--------------------------------------------------------------------------
#--------------------------------------------------------------------------
# NOTES ON TEST IMPLEMENTATION
#
# The tests in this file are implemented differently from those in other
# files. Instead, tests are specified using three primitives: SQL, PREP and
# TEST. Each primitive has a single argument. Primitives are processed in
# the order they are specified in the file.
#
# A TEST primitive specifies a TCL script as its argument. When a TEST
# directive is encountered the Tcl script is evaluated. Usually, this Tcl
# script contains one or more calls to [do_test].
#
# A PREP primitive specifies an SQL script as its argument. When a PREP
# directive is encountered the SQL is evaluated using database connection
# [db].
#
# The SQL primitives are where the action happens. An SQL primitive must
# contain a single, valid SQL statement as its argument. When an SQL
# primitive is encountered, it is evaluated one or more times to test the
# behaviour of the system when malloc() fails during preparation or
# execution of said statement. The Nth time the statement is executed,
# the Nth malloc is said to fail. The statement is executed until it
# succeeds, i.e. (M+1) times, where M is the number of mallocs() required
# to prepare and execute the statement.
#
# Each time an SQL statement fails, the driver program (see proc [run_test]
# below) figures out if a transaction has been automatically rolled back.
# If not, it executes any TEST block immediately proceeding the SQL
# statement, then reexecutes the SQL statement with the next value of N.
#
# If a transaction has been automatically rolled back, then the driver
# program executes all the SQL specified as part of SQL or PREP primitives
# between the current SQL statement and the most recent "BEGIN". Any
# TEST block immediately proceeding the SQL statement is evaluated, and
# then the SQL statement reexecuted with the incremented N value.
#
# That make any sense? If not, read the code in [run_test] and it might.
#
# Extra restriction imposed by the implementation:
#
# * If a PREP block starts a transaction, it must finish it.
# * A PREP block may not close a transaction it did not start.
#
#--------------------------------------------------------------------------
# These procs are used to build up a "program" in global variable
# ::run_test_script. At the end of this file, the proc [run_test] is used
# to execute the program (and all test cases contained therein).
#
set ::run_test_sql_id 0
set ::run_test_script [list]
proc TEST {id t} {lappend ::run_test_script -test [list $id $t]}
proc PREP {p} {lappend ::run_test_script -prep [string trim $p]}
proc DEBUG {s} {lappend ::run_test_script -debug $s}
# SQL --
#
# SQL ?-norollback? <sql-text>
#
# Add an 'SQL' primitive to the program (see notes above). If the -norollback
# switch is present, then the statement is not allowed to automatically roll
# back any active transaction if malloc() fails. It must rollback the statement
# transaction only.
#
proc SQL {a1 {a2 ""}} {
# An SQL primitive parameter is a list of three elements, an id, a boolean
# value indicating if the statement may cause transaction rollback when
# malloc() fails, and the sql statement itself.
set id [incr ::run_test_sql_id]
if {$a2 == ""} {
lappend ::run_test_script -sql [list $id true [string trim $a1]]
} else {
lappend ::run_test_script -sql [list $id false [string trim $a2]]
}
}
# TEST_AUTOCOMMIT --
#
# A shorthand test to see if a transaction is active or not. The first
# argument - $id - is the integer number of the test case. The second
# argument is either 1 or 0, the expected value of the auto-commit flag.
#
proc TEST_AUTOCOMMIT {id a} {
TEST $id "do_test \$testid { sqlite3_get_autocommit \$::DB } {$a}"
}
#--------------------------------------------------------------------------
# Start of test program declaration
#
# Warm body test. A malloc() fails in the middle of a CREATE TABLE statement
# in a single-statement transaction on an empty database. Not too much can go
# wrong here.
#
TEST 1 {
do_test $testid {
execsql {SELECT tbl_name FROM sqlite_master;}
} {}
}
SQL {
CREATE TABLE IF NOT EXISTS abc(a, b, c);
}
TEST 2 {
do_test $testid.1 {
execsql {SELECT tbl_name FROM sqlite_master;}
} {abc}
}
# Insert a couple of rows into the table. each insert is in its own
# transaction. test that the table is unpopulated before running the inserts
# (and hence after each failure of the first insert), and that it has been
# populated correctly after the final insert succeeds.
#
TEST 3 {
do_test $testid.2 {
execsql {SELECT * FROM abc}
} {}
}
SQL {INSERT INTO abc VALUES(1, 2, 3);}
SQL {INSERT INTO abc VALUES(4, 5, 6);}
SQL {INSERT INTO abc VALUES(7, 8, 9);}
TEST 4 {
do_test $testid {
execsql {SELECT * FROM abc}
} {1 2 3 4 5 6 7 8 9}
}
# Test a CREATE INDEX statement. Because the table 'abc' is so small, the index
# will all fit on a single page, so this doesn't test too much that the CREATE
# TABLE statement didn't test. A few of the transient malloc()s in btree.c
# perhaps.
#
SQL {CREATE INDEX abc_i ON abc(a, b, c);}
TEST 4 {
do_test $testid {
execsql {
SELECT * FROM abc ORDER BY a DESC;
}
} {7 8 9 4 5 6 1 2 3}
}
# Test a DELETE statement. Also create a trigger and a view, just to make sure
# these statements don't have any obvious malloc() related bugs in them. Note
# that the test above will be executed each time the DELETE fails, so we're
# also testing rollback of a DELETE from a table with an index on it.
#
SQL {DELETE FROM abc WHERE a > 2;}
SQL {CREATE TRIGGER abc_t AFTER INSERT ON abc BEGIN SELECT 'trigger!'; END;}
SQL {CREATE VIEW abc_v AS SELECT * FROM abc;}
TEST 5 {
do_test $testid {
execsql {
SELECT name, tbl_name FROM sqlite_master ORDER BY name;
SELECT * FROM abc;
}
} {abc abc abc_i abc abc_t abc abc_v abc_v 1 2 3}
}
set sql {
BEGIN;DELETE FROM abc;
}
for {set i 1} {$i < 100} {incr i} {
set a $i
set b "String value $i"
set c [string repeat X $i]
append sql "INSERT INTO abc VALUES ($a, '$b', '$c');"
}
append sql {COMMIT;}
PREP $sql
SQL {
DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
}
TEST 6 {
do_test $testid.1 {
execsql {SELECT count(*) FROM abc}
} {94}
do_test $testid.2 {
execsql {
SELECT min(
(oid == a) AND 'String value ' || a == b AND a == length(c)
) FROM abc;
}
} {1}
}
SQL {
DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
}
TEST 7 {
do_test $testid {
execsql {SELECT count(*) FROM abc}
} {89}
do_test $testid {
execsql {
SELECT min(
(oid == a) AND 'String value ' || a == b AND a == length(c)
) FROM abc;
}
} {1}
}
SQL {
DELETE FROM abc WHERE oid IN (SELECT oid FROM abc ORDER BY random() LIMIT 5);
}
TEST 9 {
do_test $testid {
execsql {SELECT count(*) FROM abc}
} {84}
do_test $testid {
execsql {
SELECT min(
(oid == a) AND 'String value ' || a == b AND a == length(c)
) FROM abc;
}
} {1}
}
set padding [string repeat X 500]
PREP [subst {
DROP TABLE abc;
CREATE TABLE abc(a PRIMARY KEY, padding, b, c);
INSERT INTO abc VALUES(0, '$padding', 2, 2);
INSERT INTO abc VALUES(3, '$padding', 5, 5);
INSERT INTO abc VALUES(6, '$padding', 8, 8);
}]
TEST 10 {
do_test $testid {
execsql {SELECT a, b, c FROM abc}
} {0 2 2 3 5 5 6 8 8}
}
SQL {BEGIN;}
SQL {INSERT INTO abc VALUES(9, 'XXXXX', 11, 12);}
TEST_AUTOCOMMIT 11 0
SQL -norollback {UPDATE abc SET a = a + 1, c = c + 1;}
TEST_AUTOCOMMIT 12 0
SQL {DELETE FROM abc WHERE a = 10;}
TEST_AUTOCOMMIT 13 0
SQL {COMMIT;}
TEST 14 {
do_test $testid.1 {
sqlite3_get_autocommit $::DB
} {1}
do_test $testid.2 {
execsql {SELECT a, b, c FROM abc}
} {1 2 3 4 5 6 7 8 9}
}
PREP [subst {
DROP TABLE abc;
CREATE TABLE abc(a, padding, b, c);
INSERT INTO abc VALUES(1, '$padding', 2, 3);
INSERT INTO abc VALUES(4, '$padding', 5, 6);
INSERT INTO abc VALUES(7, '$padding', 8, 9);
CREATE INDEX abc_i ON abc(a, padding, b, c);
}]
TEST 15 {
db eval {PRAGMA cache_size = 10}
}
SQL {BEGIN;}
SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
TEST 16 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 2 4 2 7 2}
}
SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
TEST 17 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 4 4 4 7 4}
}
SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
TEST 18 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 8 4 8 7 8}
}
SQL -norllbck {INSERT INTO abc (oid, a, padding, b, c) SELECT NULL, * FROM abc}
TEST 19 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 16 4 16 7 16}
}
SQL {COMMIT;}
TEST 21 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 16 4 16 7 16}
}
SQL {BEGIN;}
SQL {DELETE FROM abc WHERE oid %2}
TEST 22 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 8 4 8 7 8}
}
SQL {DELETE FROM abc}
TEST 23 {
do_test $testid {
execsql {SELECT * FROM abc}
} {}
}
SQL {ROLLBACK;}
TEST 24 {
do_test $testid {
execsql {SELECT a, count(*) FROM abc GROUP BY a;}
} {1 16 4 16 7 16}
}
# Test some schema modifications inside of a transaction. These should all
# cause transaction rollback if they fail. Also query a view, to cover a bit
# more code.
#
PREP {DROP VIEW abc_v;}
TEST 25 {
do_test $testid {
execsql {
SELECT name, tbl_name FROM sqlite_master;
}
} {abc abc abc_i abc}
}
SQL {BEGIN;}
SQL {CREATE TABLE def(d, e, f);}
SQL {CREATE TABLE ghi(g, h, i);}
TEST 26 {
do_test $testid {
execsql {
SELECT name, tbl_name FROM sqlite_master;
}
} {abc abc abc_i abc def def ghi ghi}
}
SQL {CREATE VIEW v1 AS SELECT * FROM def, ghi}
SQL {CREATE UNIQUE INDEX ghi_i1 ON ghi(g);}
TEST 27 {
do_test $testid {
execsql {
SELECT name, tbl_name FROM sqlite_master;
}
} {abc abc abc_i abc def def ghi ghi v1 v1 ghi_i1 ghi}
}
SQL {INSERT INTO def VALUES('a', 'b', 'c')}
SQL {INSERT INTO def VALUES(1, 2, 3)}
SQL -norollback {INSERT INTO ghi SELECT * FROM def}
TEST 28 {
do_test $testid {
execsql {
SELECT * FROM def, ghi WHERE d = g;
}
} {a b c a b c 1 2 3 1 2 3}
}
SQL {COMMIT}
TEST 29 {
do_test $testid {
execsql {
SELECT * FROM v1 WHERE d = g;
}
} {a b c a b c 1 2 3 1 2 3}
}
# Test a simple multi-file transaction
#
forcedelete test2.db
ifcapable attach {
SQL {ATTACH 'test2.db' AS aux;}
SQL {BEGIN}
SQL {CREATE TABLE aux.tbl2(x, y, z)}
SQL {INSERT INTO tbl2 VALUES(1, 2, 3)}
SQL {INSERT INTO def VALUES(4, 5, 6)}
TEST 30 {
do_test $testid {
execsql {
SELECT * FROM tbl2, def WHERE d = x;
}
} {1 2 3 1 2 3}
}
SQL {COMMIT}
TEST 31 {
do_test $testid {
execsql {
SELECT * FROM tbl2, def WHERE d = x;
}
} {1 2 3 1 2 3}
}
}
# Test what happens when a malloc() fails while there are other active
# statements. This changes the way sqlite3VdbeHalt() works.
TEST 32 {
if {![info exists ::STMT32]} {
set sql "SELECT name FROM sqlite_master"
set ::STMT32 [sqlite3_prepare $::DB $sql -1 DUMMY]
do_test $testid {
sqlite3_step $::STMT32
} {SQLITE_ROW}
}
}
SQL BEGIN
TEST 33 {
do_test $testid {
execsql {SELECT * FROM ghi}
} {a b c 1 2 3}
}
SQL -norollback {
-- There is a unique index on ghi(g), so this statement may not cause
-- an automatic ROLLBACK. Hence the "-norollback" switch.
INSERT INTO ghi SELECT '2'||g, h, i FROM ghi;
}
TEST 34 {
if {[info exists ::STMT32]} {
do_test $testid {
sqlite3_finalize $::STMT32
} {SQLITE_OK}
unset ::STMT32
}
}
SQL COMMIT
#
# End of test program declaration
#--------------------------------------------------------------------------
proc run_test {arglist iRepeat {pcstart 0} {iFailStart 1}} {
if {[llength $arglist] %2} {
error "Uneven number of arguments to TEST"
}
for {set i 0} {$i < $pcstart} {incr i} {
set k2 [lindex $arglist [expr {2 * $i}]]
set v2 [lindex $arglist [expr {2 * $i + 1}]]
set ac [sqlite3_get_autocommit $::DB] ;# Auto-Commit
switch -- $k2 {
-sql {db eval [lindex $v2 2]}
-prep {db eval $v2}
-debug {eval $v2}
}
set nac [sqlite3_get_autocommit $::DB] ;# New Auto-Commit
if {$ac && !$nac} {set begin_pc $i}
}
db rollback_hook [list incr ::rollback_hook_count]
set iFail $iFailStart
set pc $pcstart
while {$pc*2 < [llength $arglist]} {
# Fetch the current instruction type and payload.
set k [lindex $arglist [expr {2 * $pc}]]
set v [lindex $arglist [expr {2 * $pc + 1}]]
# Id of this iteration:
set iterid "pc=$pc.iFail=$iFail$k"
switch -- $k {
-test {
foreach {id script} $v {}
set testid "malloc3-(test $id).$iterid"
eval $script
incr pc
}
-sql {
set ::rollback_hook_count 0
set id [lindex $v 0]
set testid "malloc3-(integrity $id).$iterid"
set ac [sqlite3_get_autocommit $::DB] ;# Auto-Commit
sqlite3_memdebug_fail $iFail -repeat 0
set rc [catch {db eval [lindex $v 2]} msg] ;# True error occurs
set nac [sqlite3_get_autocommit $::DB] ;# New Auto-Commit
if {$rc != 0 && $nac && !$ac} {
# Before [db eval] the auto-commit flag was clear. Now it
# is set. Since an error occurred we assume this was not a
# commit - therefore a rollback occurred. Check that the
# rollback-hook was invoked.
do_test malloc3-rollback_hook_count.$iterid {
set ::rollback_hook_count
} {1}
}
set nFail [sqlite3_memdebug_fail -1 -benigncnt nBenign]
if {$rc == 0} {
# Successful execution of sql. The number of failed malloc()
# calls should be equal to the number of benign failures.
# Otherwise a malloc() failed and the error was not reported.
#
set expr {$nFail!=$nBenign}
if {[expr $expr]} {
error "Unreported malloc() failure, test \"$testid\", $expr"
}
if {$ac && !$nac} {
# Before the [db eval] the auto-commit flag was set, now it
# is clear. We can deduce that a "BEGIN" statement has just
# been successfully executed.
set begin_pc $pc
}
incr pc
set iFail 1
integrity_check $testid
} elseif {[regexp {.*out of memory} $msg] || [db errorcode] == 3082} {
# Out of memory error, as expected.
#
integrity_check $testid
incr iFail
if {$nac && !$ac} {
if {![lindex $v 1] && [db errorcode] != 3082} {
# error "Statement \"[lindex $v 2]\" caused a rollback"
}
for {set i $begin_pc} {$i < $pc} {incr i} {
set k2 [lindex $arglist [expr {2 * $i}]]
set v2 [lindex $arglist [expr {2 * $i + 1}]]
set catchupsql ""
switch -- $k2 {
-sql {set catchupsql [lindex $v2 2]}
-prep {set catchupsql $v2}
}
db eval $catchupsql
}
}
} else {
error $msg
}
# back up to the previous "-test" block.
while {[lindex $arglist [expr {2 * ($pc - 1)}]] == "-test"} {
incr pc -1
}
}
-prep {
db eval $v
incr pc
}
-debug {
eval $v
incr pc
}
default { error "Unknown switch: $k" }
}
}
}
# Turn off the Tcl interface's prepared statement caching facility. Then
# run the tests with "persistent" malloc failures.
sqlite3_extended_result_codes db 1
db cache size 0
run_test $::run_test_script 1
# Close and reopen the db.
db close
forcedelete test.db test.db-journal test2.db test2.db-journal
sqlite3 db test.db
sqlite3_extended_result_codes db 1
set ::DB [sqlite3_connection_pointer db]
# Turn off the Tcl interface's prepared statement caching facility in
# the new connnection. Then run the tests with "transient" malloc failures.
db cache size 0
run_test $::run_test_script 0
sqlite3_memdebug_fail -1
finish_test