From: thuejk at gmail dot com
Operating system: Linux
PHP version: 5.2.4
PHP Bug Type: Reproducible crash
Bug description: Recursive loop crashes php instead of emitting error
Description:
------------
When running a recursive loop with lots of iterations, PHP will segfault.
This will usually be a problem when you write buggy code by accident, but
I guess it is possible to imagine sane programs which uses lots of
recursive calls.
In any case, it is somewhat hard to debug the crash when it happens,
because you do not get an error message when running it in a browser.
Reproduce code:
---------------
<?php
$i=0;
function f() {
global $i;
printf("%d\n", $i++);
f();
}
f();
?>
Expected result:
----------------
(Ignoring the fact that the posted function is tail recursive, and
therefore could be rewritten as a non-recursive loop)
PHP should emit an E_ERROR before it runs out of space. Preferably also an
E_RECOVERABLE_ERROR or E_WARNING a little before it really runs out of
space.
Actual result:
--------------
$ php test.php
1
2
3
[...]
29066
29067
zsh: segmentation fault php test.php
--
Edit bug report at http://bugs.php.net/?id=43187&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=43187&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=43187&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=43187&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=43187&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=43187&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=43187&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=43187&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=43187&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=43187&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=43187&r=support
Expected behavior: http://bugs.php.net/fix.php?id=43187&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=43187&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=43187&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=43187&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43187&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=43187&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=43187&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=43187&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=43187&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=43187&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=43187&r=mysqlcfg
