0002224: XDebug conflicts with PHP FFI extension - crashes on FFI::new() call

ID	Project	Category	View Status	Date Submitted	Last Update
0002224	Xdebug	Uncategorized	public	2023-12-07 18:00	2023-12-08 16:10

Reporter	kraplax	Assigned To
Priority	normal	Severity	crash	Reproducibility	always
Status	resolved	Resolution	no change required
Platform	x86	OS	Linux	OS Version	any
Product Version	3.3.0

Summary	0002224: XDebug conflicts with PHP FFI extension - crashes on FFI::new() call
Description	For PHP 8.2 and 8.3 when XDebug 3.3.0 is installed, the FFI extension crashes on the call to FFI::new() method: `Fatal error: Uncaught FFI\ParserException: unexpected '<EOF>' at line 1 in /var/www/html/test.php on line 1 FFI\ParserException: unexpected '<EOF>' at line 1 in /var/www/html/test.php on line 1 Call Stack: 0.0003 458704 1. {main}() /var/www/html/test.php:0 0.0003 458832 2. FFI->new($type = '') /var/www/html/test.php:1` It doesn't affect 8.1 and older versions. Cannot be reproduced with XDebug 3.2.2.
Steps To Reproduce	Install PHP 8.2 or PHP 8.3 Install FFI extension Install XDebug 3.3.0 from PECL Run following code example: `<?php $ffi = FFI::cdef("", "libc.so.6"); $ffi->new("int");`
Tags	crash, ffi, php8.2, php8.3

Operating System
PHP Version	8.2.0-8.2.9

derick

2023-12-08 16:10

administrator ~0006716

This turned out not to be a bug with Xdebug, but with how FFI interacts with observers.

In a clean PHP compile, compiled with, and running with your test script in /tmp/ffi.php:

./configure --enable-debug --disable-all --enable-zend-test --with-ffi
make clean && make
sapi/cli/php -n  -dzend_test.observer.enabled=1 -dzend_test.observer.observe_all=1 /tmp/ffi-test.php

I get the same error (please note that I use -n to disable the standard php.ini file):

<!-- init '/tmp/ffi.php' -->
<file '/tmp/ffi.php'>
  <!-- init FFI::cdef() -->
  <FFI::cdef>
  </FFI::cdef>
  <!-- init FFI::new() -->
  <FFI::new>
    <!-- Exception: FFI\ParserException -->
  </FFI::new>
  <!-- Exception: FFI\ParserException -->
</file '/tmp/ffi.php'>
<!-- init Error::__toString() -->
<Error::__toString>
  <!-- init Error::getTraceAsString() -->
  <Error::getTraceAsString>
  </Error::getTraceAsString>
</Error::__toString>

Fatal error: Uncaught FFI\ParserException: unexpected '<EOF>' at line 1 in /tmp/ffi.php:3
Stack trace:
#0 /tmp/ffi.php(3): FFI->new('')
#1 {main}
  thrown in /tmp/ffi.php on line 3

I've filed a bug with PHP: https://github.com/php/php-src/issues/12905

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