modernc.org/cc@v1.0.1/v2/testdata/_sqlite/test/crash5.test (about)

     1  
     2  # 2007 Aug 13
     3  #
     4  # The author disclaims copyright to this source code.  In place of
     5  # a legal notice, here is a blessing:
     6  #
     7  #    May you do good and not evil.
     8  #    May you find forgiveness for yourself and forgive others.
     9  #    May you share freely, never taking more than you give.
    10  #
    11  #***********************************************************************
    12  # 
    13  # This file tests aspects of recovery from a malloc() failure
    14  # in a CREATE INDEX statement.
    15  #
    16  # $Id: crash5.test,v 1.3 2008/07/12 14:52:20 drh Exp $
    17  
    18  set testdir [file dirname $argv0]
    19  source $testdir/tester.tcl
    20  
    21  # Only run these tests if memory debugging is turned on.
    22  #
    23  ifcapable !memdebug||!crashtest||!memorymanage {
    24     puts "Skipping crash5 tests: not compiled with -DSQLITE_MEMDEBUG..."
    25     finish_test
    26     return
    27  }
    28  
    29  db close
    30  
    31  for {set ii 0} {$ii < 10} {incr ii} {
    32    for {set jj 50} {$jj < 100} {incr jj} {
    33  
    34      # Set up the database so that it is an auto-vacuum database 
    35      # containing a single table (root page 3) with a single row. 
    36      # The row has an overflow page (page 4).
    37      forcedelete test.db test.db-journal
    38      sqlite3 db test.db
    39      set c [string repeat 3 1500]
    40      db eval {
    41        pragma auto_vacuum = 1;
    42        CREATE TABLE t1(a, b, c);
    43        INSERT INTO t1 VALUES('1111111111', '2222222222', $c);
    44      }
    45      db close
    46  
    47      do_test crash5-$ii.$jj.1 {
    48        crashsql -delay 1 -file test.db-journal -seed $ii -tclbody [join [list \
    49          [list set iFail $jj] {
    50          sqlite3_crashparams 0 [file join [get_pwd] test.db-journal]
    51        
    52          # Begin a transaction and evaluate a "CREATE INDEX" statement
    53          # with the iFail'th malloc() set to fail. This operation will
    54          # have to move the current contents of page 4 (the overflow
    55          # page) to make room for the new root page. The bug is that
    56          # if malloc() fails at a particular point in sqlite3PagerMovepage(),
    57          # sqlite mistakenly thinks that the page being moved (page 4) has 
    58          # been safely synced into the journal. If the page is written
    59          # to later in the transaction, it may be written out to the database
    60          # before the relevant part of the journal has been synced.
    61          #
    62          db eval BEGIN
    63          sqlite3_memdebug_fail $iFail -repeat 0
    64          catch {db eval { CREATE UNIQUE INDEX i1 ON t1(a); }} msg
    65          # puts "$n $msg ac=[sqlite3_get_autocommit db]"
    66        
    67          # If the transaction is still active (it may not be if the malloc()
    68          # failure occurred in the OS layer), write to the database. Make sure
    69          # page 4 is among those written.
    70          #
    71          if {![sqlite3_get_autocommit db]} {
    72            db eval {
    73              DELETE FROM t1;  -- This will put page 4 on the free list.
    74              INSERT INTO t1 VALUES('111111111', '2222222222', '33333333');
    75              INSERT INTO t1 SELECT * FROM t1;                     -- 2
    76              INSERT INTO t1 SELECT * FROM t1;                     -- 4
    77              INSERT INTO t1 SELECT * FROM t1;                     -- 8
    78              INSERT INTO t1 SELECT * FROM t1;                     -- 16
    79              INSERT INTO t1 SELECT * FROM t1;                     -- 32
    80              INSERT INTO t1 SELECT * FROM t1 WHERE rowid%2;       -- 48
    81            }
    82          }
    83          
    84          # If the right malloc() failed during the 'CREATE INDEX' above and
    85          # the transaction was not rolled back, then the sqlite cache now 
    86          # has a dirty page 4 that it incorrectly believes is already safely
    87          # in the synced part of the journal file. When 
    88          # sqlite3_release_memory() is called sqlite tries to free memory
    89          # by writing page 4 out to the db file. If it crashes later on,
    90          # before syncing the journal... Corruption!
    91          #
    92          sqlite3_crashparams 1 [file join [get_pwd] test.db-journal]
    93          sqlite3_release_memory 8092
    94        }]] {}
    95        expr 1
    96      } {1}
    97    
    98      sqlite3 db test.db
    99      do_test crash5-$ii.$jj.2 {
   100        db eval {pragma integrity_check}
   101      } {ok}
   102      do_test crash5-$ii.$jj.3 {
   103        db eval {SELECT * FROM t1}
   104      } [list 1111111111 2222222222 $::c]
   105      db close
   106    }
   107  }
   108  
   109  
   110  finish_test