Bug #78151 [NEW]: Segfault caused by indirect expressions in PHP 7.4a1

From: jfcherng at gmail dot com Operating system: Win7 x64 PHP version: Next Minor Version Package: Scripting Engine problem Bug Type: Bug Bug description:Segfault caused by indirect expressions in PHP 7.4a1 Description: ------------ I downloaded the PHP 7.4 alpha 1 release from "https://windows.php.net/downloads/qa/php-7.4.0alpha1-nts-Win32-vs16-x64.zip" and decompressed it without any modification (I did not even create a php.ini). I then ran the attached test script with the PHP QA release ( $ php.exe test.php ) and got a segfault. I *cannot* reproduce this issue on my CentOS machine somehow. Test script: --------------- <?php class Arr { private $foo = ''; public function __construct(array $array = []) { $property = 'foo'; // segfault in PHP 7.4.0alpha1 but is fine in PHP 7.3.7RC1 $this->{$property} = &$array[$property]; // this is fine in both PHP versions // $this->foo = &$array[$property]; \var_dump($this->foo); } } $arr = new Arr(['foo' => 'bar']); Expected result: ---------------- string(3) "bar" Actual result: -------------- Segmentation fault -- Edit bug report at https://bugs.php.net/bug.php?id=78151&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=78151&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=78151&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=78151&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=78151&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78151&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78151&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78151&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78151&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78151&r=support Expected behavior: https://bugs.php.net/fix.php?id=78151&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78151&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78151&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78151&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78151&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=78151&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78151&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78151&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78151&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78151&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78151&r=mysqlcfg