Edit report at https://bugs.php.net/bug.php?id=53228&edit=1
ID: 53228
Comment by: jille at hexon dot cx
Reported by: kgrecki at gmail dot com
Summary: memory leak when throwing exception in custom
handler in functions
Status: Open
Type: Bug
Package: Scripting Engine problem
Operating System: Linux
PHP Version: 5.3.3
Block user comment: N
Private report: N
New Comment:
This is not a bug. If you unset($e); you don't leak any memory.
It is because exceptions include a backtrace, containing all the arguments
given to the error handling closure. The fifth argument given is $context, an
array containing all local variables, including the previous $e.
Previous Comments:
------------------------------------------------------------------------
[2010-11-04 17:14:07] uramihsayibok at gmail dot com
unset($e)ing in the catch block plugs the hole - the previous value/exception
in
$e isn't being destroyed?
------------------------------------------------------------------------
[2010-11-02 18:48:12] kgrecki at gmail dot com
Description:
------------
I encountered a similar issue to #25335 where custom error handler + exceptions
leaks memory but only when try-catch block is in a function and looped through
directly. I imagine there's some scope/GC issues here, and whether this is
actual
bug or limitation of PHP.
Test script:
---------------
<?
set_error_handler(function($errno, $errstr, $errfile, $errline){
throw new Exception($errstr);
});
function leak() {
while (true) {
try {
// throw new Exception(); //it doesn't leak if it's thrown directly
1 / 0; //leaks
} catch (Exception $e) {}
echo memory_get_usage(), PHP_EOL;
}
}
leak();
/* it doesn't leak if it's outside of the function */
while (true) {
try {
1 / 0;
} catch (Exception $e) {
}
echo memory_get_usage(), PHP_EOL;
}
/* it doesn't leak if try-catch block is in a separate function */
function foo() {
$try = function(){
try {1 / 0;} catch (Exception $e) {}
};
while (true) {
$try();
echo memory_get_usage(), PHP_EOL;
}
}
foo();
Expected result:
----------------
637512
637512
637512
637512
637512
637512
...
Actual result:
--------------
639432
644272
649080
653896
658704
663512
668320
...
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=53228&edit=1
