Edit report at https://bugs.php.net/bug.php?id=60682&edit=1
ID: 60682
User updated by: charlie at charliesomerville dot com
Reported by: charlie at charliesomerville dot com
Summary: Infinite recursion through call_user_func causes
segmentation fault
Status: Bogus
Type: Bug
Package: Reproducible crash
Operating System: Irrelevant
PHP Version: 5.3.8
Block user comment: N
Private report: N
New Comment:
> but call to zend_call_user_function is definitly will be recursivly.
So there *is* an issue here, and this bug is definitely not bogus.
Maybe it would be a good idea to set a hard coded or perhaps php.ini
configurable recursion
limit for calls going through zend_call_user_function(), that when exceeded
causes a fatal
error.
I understand that xdebug is a very helpful extension, but this sort of problem
should definitely
be caught by PHP. I didn't have xdebug installed when I found this bug in some
code I was
working on, so I wasted a fair amount of time head scratching trying to figure
out why PHP was
segfaulting before I found the typo that was causing my code to infinitely
recurse.
Previous Comments:
------------------------------------------------------------------------
[2012-01-09 07:53:51] [email protected]
sure, that is because there is some improvment in zend_execute which make the
function call no-need to call zend_execute recursivly,
but call to zend_call_user_function is definitly will be recursivly.
thanks
------------------------------------------------------------------------
[2012-01-09 04:32:20] charlie at charliesomerville dot com
I believe a segmentation fault due to a VM stack overflow is *definitely* a
bug.
You'd be hard-pressed to find another managed language where user code that
recurses too deep actually crashes the VM.
PHP manages to handle stack overflows just fine in other situations anyway:
function f() { f(); }
function f() { $a = "f"; $a(); }
Neither of those functions will crash the interpreter when called.
------------------------------------------------------------------------
[2012-01-09 04:26:44] [email protected]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php
reason is stack overflow, not php issues, but fyi, you can install xdebug to
prevent this.
------------------------------------------------------------------------
[2012-01-07 15:49:55] charlie at charliesomerville dot com
Description:
------------
The PHP interpreter crashes when a call_user_func recurses too deep, rather
than
dying with a memory error.
Test script:
---------------
<?php
function f() { call_user_func("f"); }
f();
Expected result:
----------------
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate
523800 bytes) in /Users/charlie/crap/notsegfault.php on line 4
Actual result:
--------------
Segmentation fault
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=60682&edit=1
