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Bug #40770 Apache child exits when PHP memory limit reached
Submitted: 2007-03-10 03:24 UTC Modified: 2007-03-12 17:00 UTC
From: php at edwardk dot info Assigned: dmitry (profile)
Status: Closed Package: Reproducible crash
PHP Version: 5.2.1 OS: Windows 2003
Private report: No CVE-ID: None
 [2007-03-10 03:24 UTC] php at edwardk dot info
Running Apache 1.3.37 with PHP 5.2.1 on Windows 2003 Standard 32bit

The following PHP code was called from a browser with the size=149 (to simulate 149MB use) and the PHP memory limit is 160M.

Reproduce code:
if (isset($_GET['size']) && $_GET['size'] < 200) {
$mb = intval($_GET['size']);
else {
$var = '';
echo 'Memory limit: '.ini_get('memory_limit').'<br>';
for ($i=0; $i<=$mb; $i++) {
        $var.= str_repeat('a',1*1024*1024);
        echo memory_get_usage().'<br>';
echo 'String length: '. strlen($var);

Expected result:
PHP should, if it did run out of memory, exit with something along the lines of

Fatal error:  Allowed memory size of xxx bytes exhausted (tried to allocate yyy bytes)

otherwise, the script should execute without crashing.

Actual result:
Apache child exits, browser waiting for the result of the page get a TCP connection reset and no page loaded.


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 [2007-03-11 14:52 UTC]
Are you running debug build of PHP by any chance?
 [2007-03-11 21:35 UTC] php at edwardk dot info
I don't believe so. It should be the official PHP 5.2.1 windows binary release.

phpinfo() reports:

PHP Version 5.2.1
Build Date 	Feb 7 2007 23:10:31
Configure Command 	cscript /nologo configure.js "--enable-snapshot-build" "--with-gd=shared"
 [2007-03-12 03:27 UTC]
I can reproduce the problem. When running this example in CLI PHP aborts with:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 133169153 bytes) in C:\php4build\PHP_5_2\Release_TS\t.php on line 12
zend_mm_heap corrupted

 [2007-03-12 03:36 UTC]
Also happens in the latest 5.2 with both win32 and malloc ZEND_MM_MEM_TYPE.

USE_ZEND_ALLOC=0 makes the problem disappear, but then no memory limit is enforced.

 [2007-03-12 17:00 UTC]
Fixed in CVS HEAD and PHP_5_2
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