#47469 [NEW]: beginTransaction causing deadlock in SQLite3
From: rjohnson at intepro dot us
Operating system: Windows XP SP3
PHP version: 5.2.8
PHP Bug Type: PDO related
Bug description: beginTransaction causing deadlock in SQLite3
Description:
------------
When executing 2 separate processes that insert or update a SQLite3
database, PDO allows both to begin a transaction rather than indicating
that another transaction has locked the database. This causes deadlock.
Using SQLite2 we would issue a BEGIN and catch a SQLITE_BUSY, then usleep
and try again. This worked flawlessly.
Reproduce code:
---------------
http://beacon.intepro.us/pdoSqliteBug.html
Expected result:
----------------
We run this code from 2 tabs in Firefox with name=0 and name=1 passed as
$_GET params. The sleep(1) allows us enough time to execute both processes
simultaneously.
The beginTransaction in the 2nd script should detect that SQLite is busy
(the 1st transaction has a lock on the file), the code should sleep for .25
of a second and try again until the first process is done, then the second
should complete. Both processes should complete in roughly 20 seconds.
Actual result:
--------------
Both scripts run indefinitely. If we stop the second process, the first
will complete.
--
Edit bug report at http://bugs.php.net/?id=47469&edit=1
--
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=47469&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=47469&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=47469&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=47469&r=fixedcvs
Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=47469&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=47469&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=47469&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=47469&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=47469&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=47469&r=support
Expected behavior: http://bugs.php.net/fix.php?id=47469&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=47469&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=47469&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=47469&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47469&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47469&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=47469&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=47469&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=47469&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=47469&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=47469&r=mysqlcfg
Thread (4 messages)
- rjohnson at intepro dot us