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IDProjectCategoryView StatusDate SubmittedLast Update
0002381XdebugStep Debuggingpublic2025-11-04 00:042025-11-04 00:05
Reporterkalle Assigned To 
PrioritynormalSeveritycrashReproducibilityalways
Status newResolutionopen 
Summary0002381: Step debug evaluator crashes when using ::class to deference expression
Description

When using ::class to dereference the result of an expression during step-debugging, then xdebug will crash. This seems to only happen when you put a breakpoint and use the editor to manually evaluate an expression. In my case I use PHPStorm.

In the attached script, I put a breakpoint on the echo statement and intercepted it via PHPStorm, once the step debugger is visible, hit ALT+F8 and the Evaluate window should open, paste in the expression from the echo and the crash should be triggered.

I'm not on a system currently that can assist much in deeper trashes but I left what I could by using pdb files

Steps To Reproduce
<?php

class T {
    function __construct() {
        $this->a = [new stdClass()];

        // Put a breakpoint on the echo and open the evaluator and type in the expression:
        // $this->a[0]::class
        echo $this->a[0]::class;
    }
}

new T;
Additional Information

Xdebug 3.4.7 (not listed in the product version dropdown)
PhpStorm 2025.2.4 (Build #PS-252.27397.112, built on October 24, 2025)
PHP 8.4.14 (cli) (built: Oct 22 2025 08:46:50) (NTS Visual C++ 2022 x64)
Microsoft Windows [Version 10.0.19045.6456]

Stack trace:

>   php8.dll!zval_ptr_dtor(_zval_struct * zval_ptr) Line 84 C
    php_xdebug.dll!xdebug_dbgp_handle_eval(_xdebug_xml_node * * retval, _xdebug_con * context, xdebug_dbgp_arg * args) Line 1166    C
    php_xdebug.dll!xdebug_dbgp_parse_option(_xdebug_con * context, char * line, int flags, _xdebug_xml_node * retval) Line 2207 C
    php_xdebug.dll!xdebug_dbgp_cmdloop(_xdebug_con * context, int bail) Line 2316   C
    php_xdebug.dll!xdebug_dbgp_breakpoint(_xdebug_con * context, _xdebug_vector * stack, _zend_string * filename, long lineno, int type, char * exception, char * code, const char * message, _xdebug_brk_info * brk_info, _zval_struct * return_value) Line 2693   C
    php_xdebug.dll!xdebug_debugger_statement_call(_zend_string * filename, int lineno) Line 360 C
    php_xdebug.dll!xdebug_statement_call(_zend_execute_data * frame) Line 780   C
    php8.dll!zend_extension_statement_handler(const _zend_extension * extension, _zend_execute_data * frame) Line 2358  C
    php8.dll!zend_llist_apply_with_argument(_zend_llist * l, void(*)(void *, void *) func, void * arg) Line 236 C
    php8.dll!ZEND_EXT_STMT_SPEC_HANDLER(_zend_execute_data * execute_data) Line 3079    C
    php8.dll!execute_ex_real(_zend_execute_data * ex) Line 58666    C
    [External Code] 
    php8.dll!ZEND_DO_FCALL_SPEC_OBSERVER_HANDLER(_zend_execute_data * execute_data) Line 2182   C
    php8.dll!execute_ex_real(_zend_execute_data * ex) Line 58666    C
    [External Code] 
    php8.dll!zend_execute(_zend_op_array * op_array, _zval_struct * return_value) Line 64320    C
    php8.dll!zend_execute_script(int type, _zval_struct * retval, _zend_file_handle * file_handle) Line 1935    C
    php8.dll!php_execute_script_ex(_zend_file_handle * primary_file, _zval_struct * retval) Line 2577   C
    php84.exe!php_cli_server_dispatch_script(php_cli_server * server, php_cli_server_client * client) Line 2137 C
    php84.exe!php_cli_server_dispatch(php_cli_server * server, php_cli_server_client * client) Line 2323    C
    php84.exe!php_cli_server_do_event_for_each_fd_callback(void * _params, unsigned __int64 fd, int event) Line 2746    C
    php84.exe!php_cli_server_poller_iter_on_active(php_cli_server_poller * poller, void * opaque, ZEND_RESULT_CODE(*)(void *, unsigned __int64, int)) Line 920  C
    [Inline Frame] php84.exe!php_cli_server_do_event_for_each_fd(php_cli_server *) Line 2764    C
    [Inline Frame] php84.exe!php_cli_server_do_event_loop(php_cli_server *) Line 2776   C
    php84.exe!do_cli_server(int argc, char * * argv) Line 2908  C
    php84.exe!main(int argc, char * * argv) Line 1313   C
    [External Code]

Symbols:

'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\php84.exe'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\ws2_32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\rpcrt4.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\shell32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\msvcp_win.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\ucrtbase.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\user32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\php8.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\win32u.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\gdi32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\gdi32full.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\crypt32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\ole32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\vcruntime140.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\combase.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\IPHLPAPI.DLL'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\advapi32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\sechost.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\bcrypt.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\dnsapi.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\imm32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\nsi.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\bcryptprimitives.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_xdebug.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_curl.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\Wldap32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\libssl-3-x64.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\normaliz.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\libcrypto-3-x64.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\libssh2.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\nghttp2.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_fileinfo.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_mbstring.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_mysqli.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_openssl.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_pdo_mysql.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_pdo_pgsql.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\libpq.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\secur32.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\sspicli.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_pdo_sqlite.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\libsqlite3.dll'. Module was built without symbols.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_pgsql.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_sqlite3.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\dev\php\8.4\ext\php_zip.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\SHCore.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\mswsock.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Program Files\Bonjour\mdnsNSP.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\rasadhlp.dll'. Symbol loading disabled by Include/Exclude setting.
'php84.exe' (Win32): Loaded 'C:\Windows\System32\FWPUCLNT.DLL'. Symbol loading disabled by Include/Exclude setting.
The thread 9468 has exited with code 0 (0x0).
Unhandled exception at 0x00007FFB6D967EAD (php8.dll) in php84.exe: 0xC0000005: Access violation writing location 0x0000000000000002.

Variables from the frame before the crash:

+       &ret_zval   0x00000081ad3f8390 {value={lval=2 dval=9.881312916825e-324#DEN counted=0x0000000000000002 {gc={...} } ...} ...} _zval_struct *
+       *retval 0x000001e6330ffea0 {tag=0x00007ffb91d0de68 "response" text=0x0000000000000000 <NULL> attribute=0x000001e633179e70 {...} ...}    _xdebug_xml_node *

PHP extensions:

C:\Users\Kalle>php84 -m
[PHP Modules]
bcmath
calendar
Core
ctype
curl
date
dom
fileinfo
filter
hash
iconv
json
libxml
mbstring
mysqli
mysqlnd
openssl
pcre
PDO
pdo_mysql
pdo_pgsql
pdo_sqlite
pgsql
Phar
random
readline
Reflection
session
SimpleXML
SPL
sqlite3
standard
tokenizer
xdebug
xml
xmlreader
xmlwriter
zip
zlib

[Zend Modules]
Xdebug
Tagsbreakpoint, crash, eval, php8.4
Operating SystemWindows 10 x64
PHP Version8.4.10-8.4.19

Activities

kalle

2025-11-04 00:04

reporter   ~0007383

image.png (37,410 bytes)   
image.png (37,410 bytes)   

kalle

2025-11-04 00:05

reporter   ~0007384

image-2.png (232,565 bytes)   
image-2.png (232,565 bytes)   

Issue History

Date Modified Username Field Change
2025-11-04 00:04 kalle New Issue
2025-11-04 00:04 kalle Tag Attached: breakpoint
2025-11-04 00:04 kalle Tag Attached: crash
2025-11-04 00:04 kalle Tag Attached: eval
2025-11-04 00:04 kalle Tag Attached: php8.4
2025-11-04 00:04 kalle Note Added: 0007383
2025-11-04 00:04 kalle File Added: image.png
2025-11-04 00:05 kalle Note Added: 0007384
2025-11-04 00:05 kalle File Added: image-2.png