mprotect() failed [13] Permission denied followed by a SIBGUS on MacOS with Apple Silicon and PHP ZTS

[realFlowControl]

Description

The following code:

<?php
echo "Done";

Resulted in this output:

mprotect() failed [13] Permission denied
Bus error: 10

But I expected this output instead:

done

Executed on CLI using /opt/php/8.3/bin/php -n -d "zend_extension=opcache" -d "opcache.enable_cli=1" -d "opcache.jit=tracing" -d "opcache.jit_buffer_size=40M" -f test.php (where test.php holds the above content).

Using lldb I get the following:

Process 39185 launched: '/opt/php/8.3/bin/php' (arm64)
mprotect() failed [13] Permission denied
Process 39185 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x110fa3ff0)
    frame #0: 0x0000000102deb668 opcache.so`zend_jit_startup(buf=0x000000010e7a4000, size=41943040, reattached=false) at zend_jit.c:4994:13
   4991		dasm_ptr = dasm_end = (void*)(((char*)dasm_buf) + size - sizeof(*dasm_ptr) * 2);
   4992		if (!reattached) {
   4993			zend_jit_unprotect();
-> 4994			*dasm_ptr = dasm_buf;
   4995	#if _WIN32
   4996			/* reserve space for global labels */
   4997			*dasm_ptr = (void**)*dasm_ptr + zend_lb_MAX;
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x110fa3ff0)
  * frame #0: 0x0000000102deb668 opcache.so`zend_jit_startup(buf=0x000000010e7a4000, size=41943040, reattached=false) at zend_jit.c:4994:13
    frame #1: 0x0000000102d93590 opcache.so`accel_post_startup at ZendAccelerator.c:3253:8
    frame #2: 0x00000001007f6550 php`zend_post_startup at zend.c:1072:7
    frame #3: 0x00000001006f95ec php`php_module_startup(sf=0x0000000101506e28, additional_module=0x0000000000000000) at main.c:2259:6
    frame #4: 0x0000000100a9c84c php`php_cli_startup(sapi_module=0x0000000101506e28) at php_cli.c:410:9
    frame #5: 0x0000000100a9a860 php`main(argc=12, argv=0x0000600002344000) at php_cli.c:1307:6
    frame #6: 0x0000000189acd0e0 dyld`start + 2360

The mprotect() failed [13] Permission denied originates from the mprotect() call in zend_jit_unprotect() in

php-src/ext/opcache/jit/zend_jit.c

Lines 4657 to 4659 in e71b597

	if (mprotect(dasm_buf, dasm_size, opts) != 0) {
	fprintf(stderr, "mprotect() failed [%d] %s\n", errno, strerror(errno));
	}

This might be related: https://developer.apple.com/forums/thread/672804

PHP Version

8.3 ZTS (it is not failing on NTS version of PHP, only on ZTS)

Operating System

MacOS 14.13.1

[devnexen]

It had been decided recently to disable opcache JIT on macos arm64 (with ZTS enabled) specifically for next releases.