Hi Derick! On 09.11.2016 at 15:21, Derick Rethans wrote:
> Hi! > > Through https://bugs.xdebug.org/view.php?id=1185 I ran into a bug in PHP > proper. Apparently, this script: > > <?php > > class A { > static private $a; > > static public function init() { > self::$a = 123; > } > } > > A::init(); > > echo 'succcess!'; > > And running it with "valgrind php -n index.php", produces: > > root@debian-8-64bit:/home/derick/xdebug-issue-1185# valgrind php -n > index.php > ==760== Memcheck, a memory error detector > ==760== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. > ==760== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright > info > ==760== Command: php -n index.php > ==760== > ==760== Conditional jump or move depends on uninitialised value(s) > ==760== at 0x797992: zend_std_get_static_method > (zend_object_handlers.c:1261) > ==760== by 0x7B66FE: > ZEND_INIT_STATIC_METHOD_CALL_SPEC_CONST_CONST_HANDLER (zend_vm_execute.h:3887) > ==760== by 0x7A379F: execute_ex (zend_vm_execute.h:363) > ==760== by 0x76E2AF: zend_execute_scripts (zend.c:1341) > ==760== by 0x70CC87: php_execute_script (main.c:2613) > ==760== by 0x81A990: do_cli (php_cli.c:998) > ==760== by 0x431996: main (php_cli.c:1382) > ==760== > succcess!==760== > ==760== HEAP SUMMARY: > ==760== in use at exit: 96 bytes in 3 blocks > ==760== total heap usage: 19,605 allocs, 19,602 frees, 3,589,979 > bytes allocated > ==760== > ==760== LEAK SUMMARY: > ==760== definitely lost: 0 bytes in 0 blocks > ==760== indirectly lost: 0 bytes in 0 blocks > ==760== possibly lost: 0 bytes in 0 blocks > ==760== still reachable: 96 bytes in 3 blocks > ==760== suppressed: 0 bytes in 0 blocks > ==760== Rerun with --leak-check=full to see details of leaked memory > ==760== > ==760== For counts of detected and suppressed errors, rerun with: -v > ==760== Use --track-origins=yes to see where uninitialised values come > from > ==760== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0) > > This is with the latest PHP-5.6 branch, and the GCC that comes with > Debian Jessie: > > root@debian-8-64bit:/home/derick/xdebug-issue-1185# gcc --version > gcc (Debian 4.9.2-10) 4.9.2 > > > Annoyingly, I can only produce this on a Debian Jessie (8.6) fresh install, > and > not on my local machine. I can't seem to find the problem either, but I *can* > provide a VM and instructions to reproduce this. Or provide SSH access > into it upon request. > > Anybody wants to try and fix this? I'm going to see whether PHP 7.0 and > 7.1 have a similar issue too. zend_std_get_static_method() declares use_heap[1] (if there's support for alloca), but doesn't initialize it with SET_ALLOCA_FLAG()[2]. It seems to me that ALLOCA_FLAG()[3] should be defined like so: # define ALLOCA_FLAG(name) \ zend_bool name = 0; [1] <http://lxr.php.net/xref/PHP-5.6/Zend/zend_object_handlers.c#1184> [2] <http://lxr.php.net/source/xref/PHP-5.6/Zend/zend.h#200> [3] <http://lxr.php.net/source/xref/PHP-5.6/Zend/zend.h#198> -- Christoph M. Becker -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
