#31854 [Opn->Fbk]: Segfault if set memory_limit and other goodies
| From: | sniper@php.net | Date: | Sun, 06 Feb 2005 05:57:56 +0000 |
| Subject: | #31854 [Opn->Fbk]: Segfault if set memory_limit and other goodies | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-73547@lists.php.net to get a copy of this message | ||
ID: 31854
Updated by: sniper@php.net
Reported By: bertrand at toggg dot com
-Status: Open
+Status: Feedback
Bug Type: Reproducible crash
Operating System: FC2
PHP Version: 4.3.10
New Comment:
Please try using this CVS snapshot:
http://snaps.php.net/php4-STABLE-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php4-win32-STABLE-latest.zip
Previous Comments:
------------------------------------------------------------------------
[2005-02-05 20:31:24] bertrand at toggg dot com
Description:
------------
This script doubles and again an array of long strings.
It accepts 3 parameters:
- nb of times to double the array
- eventuel memory_limit to set (thus default 8 Mo)
- interval of added rows to check memory_get_usage.
By 18 loops the 8Mo are exhausted.
Depending on the memory setting and the interval to check memory usage,
results are somewhat strange.
The segmentation fault occurs the same if running from Apache 2.0
Handler
It could be related to bug #31624
Reproduce code:
---------------
$loop = isset($_SERVER['argv'][1]) ? $_SERVER['argv'][1]+0 : 11;
$setmem = isset($_SERVER['argv'][2]) ? $_SERVER['argv'][2]+0 : ''; //
changed if set
$chk = isset($_SERVER['argv'][3]) ? $_SERVER['argv'][3]+0 : 100;
if ($setmem) {
if (ini_set ('memory_limit', $setmem*1048576)) {
echo 'Set memory limit to '.$setmem." Mo\n";
} else {
echo 'FAILED to set memory limit to '.$setmem." Mo\n";
}
}
error_reporting(E_ALL);
$arr = array (str_repeat('X', 65536));
$mem = 0;
while ($loop--) {
for ($i = count($arr); $i; $i--) {
$arr[] = $arr[0];
if ($i%$chk) continue;
if ( ( ($nmem = memory_get_usage()) - $mem) > 1000000) {
$mem = $nmem;
echo 'Count:'.count($arr)." ($mem bytes)\n";
}
}
echo $loop.':'.count($arr).'/'.memory_get_usage() . " bytes\n"; //
36640
}
echo "\n OK \n";
Expected result:
----------------
1) no memory_limit set
PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried
to allocate 35 bytes) in /home/bertrand/prog/test/outmem.php on line 19
+ break
2) with memory_limit set.
If not enough: same as 1)
Enough memory: OK
Actual result:
--------------
1) no memory_limit set
I actually get memory exhausted, but if I lower the memory_get_usage
frequence, then no break, must control-C:
php outmem.php 18 '' 100 ---> break, get hand back
php outmem.php 18 '' 1000 ---> I must abort
That means if I check memory_get_usage only each 1000 rows PHP is not
coming back, but everything OK if I check each 100 rows ????
PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried
to allocate 35 bytes) in /home/bertrand/prog/test/outmem.php on line 19
Allowed memory size of 8388608 bytes exhausted (tried to allocate 129
bytes)
The second message is coming after a long while, but the PHP is
sleeping and I need to break
2) with memory_limit
It's as expected but will in both cases (enough mem or not) make a
segmentation fault.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=31854&edit=1