Bug #77575 [Opn->Nab]: set_error_handler() / ErrorException memory leak
Edit report at https://bugs.php.net/bug.php?id=77575&edit=1
ID: 77575
Updated by: nikic@php.net
Reported by: frame86 at live dot com
Summary: set_error_handler() / ErrorException memory leak
-Status: Open
+Status: Not a bug
Type: Bug
Package: *General Issues
Operating System: Ubuntu 18.04.1 LTS
PHP Version: 7.2.14
Block user comment: N
Private report: N
New Comment:
The reason is that the error handler receives the variable scope (including $e) and the exception
includes the backtrace including arguments, which also includes that variable scope. So effectively
you're constructing a very long and bulky linked list of exceptions.
What you can do:
* On any version: unset($e)
* On PHP 7.4: Set zend.exception_ignore_args=1 to disable arg collection
* On PHP 8.0: Variable scope is no longer passed to error handler, so the issue doesn't exist.
Previous Comments:
------------------------------------------------------------------------
[2019-02-06 02:55:53] frame86 at live dot com
Description:
------------
Using an error handler, throwing and catching the ErrorException leaks memory.
Test script:
---------------
<?php
$last = time();
ini_set('memory_limit', '8G');
set_error_handler(function ($severity, $message, $file, $line) {
throw new \ErrorException($message, 0, $severity, $file, $line);
});
while(true)
{
try {
trigger_error("Something");
} catch(\Throwable $e) {
}
if(time() - $last >= 1) {
$last = time();
printf("\nMemory: %.4f", memory_get_usage() / (1024 * 1024));
}
gc_collect_cycles(); // doesn't help much
}
Expected result:
----------------
Nearly constant memory usage
Actual result:
--------------
Memory: 3.7187
Memory: 5.0504
Memory: 6.0593
Memory: 6.9050
Memory: 7.6437
Memory: 8.3095
Memory: 8.9218
Memory: 9.4904
...
Memory: 97.7963
Memory: 219.5202
Memory: 300.1706
Segmentation fault (core dumped)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=77575&edit=1
Thread (2 messages)