Bug with concurrency compiling in OPcache

[allsilaevex]

1. What did you do? If possible, provide a simple script for reproducing the error.

php main.php

main.php

<?php

$createProcess = static function () {
    return new Swoole\Process(static function () {
        require_once __DIR__ . '/required.php';
    });
};

$count = 10; // 10 - for example
$processes = [];

foreach (range(0, $count) as $n) {
    $processes[] = $createProcess();
}

foreach ($processes as $process) {
    $process->start();
}

foreach (range(0, $count) as $n) {
    Swoole\Process::wait(true);
}

required.php

<?php

class Foo__ {}

foreach (range(0, 10_000) as $i) { // 10_000 - for example
    \class_alias(Foo__::class, 'Bar__' . $i, false);
}

2. What did you expect to see?

correct work

3. What did you see instead?

error not every script run! it works for me every few times with opcache.enable = 1
if you disable opcache (opcache.enable = 0), the bug does not reoccur

output

Assertion failed: zv != ((void*)0) (/usr/src/php/Zend/zend_vm_execute.h: zend_get_opcode_handler_func: 64195)

core dump

#0  0x00007fbd32029d07 in setjmp () from /lib/ld-musl-x86_64.so.1
#1  0x00007fbd32029e5c in raise () from /lib/ld-musl-x86_64.so.1
#2  0x0000003000000010 in ?? ()
#3  0x00007ffd227489b0 in ?? ()
#4  0x00007ffd227488f0 in ?? ()
#5  0x00007fbd31107781 in dasm_actions () from /usr/local/lib/php/extensions/debug-non-zts-20220829/opcache.so
#6  0x3c8649b0a918003e in ?? ()
#7  0x0000561badca30f0 in ?? ()
#8  0x0000561badca2cb8 in ?? ()
#9  0x0000561badcaa8a0 in ?? ()
#10 0x000000000000fac3 in ?? ()
#11 0x00007fbaa74c0300 in ?? ()
#12 0x00007fbaa74c0534 in ?? ()
#13 0x0000003000000018 in ?? ()
#14 0x00007ffd22748a10 in ?? ()
#15 0x00007ffd22748950 in ?? ()
#16 0x3c8649b0a918003e in ?? ()
#17 0x00007fbca774b358 in ?? ()
#18 0x00007fbae7d61230 in ?? ()
#19 0x00007ffd227489e0 in ?? ()
#20 0x00007fbd31ffcfa8 in abort () from /lib/ld-musl-x86_64.so.1
#21 0x00007fbaa76d8e00 in ?? ()
#22 0x00007fbcaf796730 in ?? ()
#23 0x00007ffd227489b0 in ?? ()
#24 0x0000561bad1d168b in zend_hash_index_find (ht=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>, h=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>) at /usr/src/php/Zend/zend_hash.c:2608

5. What version of Swoole are you using (show your php --ri swoole)?

swoole

Swoole => enabled
Author => Swoole Team <team@swoole.com>
Version => 5.1.0
Built => Nov 10 2023 07:26:12
coroutine => enabled with boost asm context
debug => enabled
trace_log => enabled
epoll => enabled
eventfd => enabled
signalfd => enabled
spinlock => enabled
rwlock => enabled
openssl => OpenSSL 3.1.4 24 Oct 2023
dtls => enabled
http2 => enabled
json => enabled
curl-native => enabled
pcre => enabled
c-ares => 1.19.1
zlib => 1.2.13
brotli => E16777225/D16777225
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
mysqlnd => enabled
async_redis => enabled

Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_fiber_mock => Off => Off
swoole.enable_preemptive_scheduler => Off => Off
swoole.display_errors => On => On
swoole.use_shortname => On => On
swoole.unixsock_buffer_size => 8388608 => 8388608

6. What is your machine environment used (show your uname -a & php -v & gcc -v) ?

Linux 3c54021d9c74 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 Linux

PHP 8.2.12 (cli) (built: Nov 10 2023 07:21:43) (NTS DEBUG)
Copyright (c) The PHP Group
Zend Engine v4.2.12, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.12, Copyright (c), by Zend Technologies

[allsilaevex]

I would like to add information. This seems to repeat only with jit enabled, like this:

opcache.jit = 1215
opcache.jit_buffer_size = 128M

[matyhtf]

This is probably a bug of opcache jit. There is nothing we can do. It is recommended to submit it to php-src. We hope that the php team can solve this issue.