Restarting workers through admin API corrupts zend_mm_heap

[alexandre-daubois]

What happened?

When restarting workers through the admin API, FrankenPHP crashes. I can investigate the issue myself whenever I have some bandwidth, and I'm creating the issue so I don't forget about it.

Produced in the latest asset for macOS on Apple Silicon, running a fresh install of Symfony Demo.

Build Type

Custom (tell us more in the description)

Worker Mode

Yes

Operating System

macOS

CPU Architecture

Apple Silicon

Relevant log output

Relevant log output

2026/03/10 09:57:10.761	INFO	workers restarted from admin api
zend_mm_heap corrupted
zend_mm_heap corrupted
zend_mm_heap corrupted
zend_mm_heap corrupted
zend_mm_heap corrupted
zend_mm_heap corrupted
Process 76939 stopped
* thread #31, name = 'php-b', stop reason = signal SIGABRT
    frame #0: 0x000000019263d5b0 libsystem_kernel.dylib`__pthread_kill + 8
libsystem_kernel.dylib`__pthread_kill:
->  0x19263d5b0 <+8>:  b.lo   0x19263d5d0    ; <+40>
    0x19263d5b4 <+12>: pacibsp 
    0x19263d5b8 <+16>: stp    x29, x30, [sp, #-0x10]!
    0x19263d5bc <+20>: mov    x29, sp
Target 0: (frankenphp-mac-arm64) stopped.
(lldb) bt
* thread #31, name = 'php-b', stop reason = signal SIGABRT
  * frame #0: 0x000000019263d5b0 libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x0000000192677888 libsystem_pthread.dylib`pthread_kill + 296
    frame #2: 0x000000019257c850 libsystem_c.dylib`abort + 124
    frame #3: 0x0000000101a17064 frankenphp-mac-arm64`zend_mm_panic + 48
    frame #4: 0x000000010333a1bc frankenphp-mac-arm64`_efree.cold.1 + 20
    frame #5: 0x0000000101a1b20c frankenphp-mac-arm64`_efree + 200
    frame #6: 0x0000000101a44b64 frankenphp-mac-arm64`zend_type_to_string_resolved + 188
    frame #7: 0x0000000101a71cdc frankenphp-mac-arm64`zend_verify_arg_error + 88
    frame #8: 0x0000000101a91664 frankenphp-mac-arm64`ZEND_RECV_INIT_SPEC_CONST_HANDLER + 936
    frame #9: 0x00000001033408dc frankenphp-mac-arm64`execute_ex + 156
    frame #10: 0x000000010334b11c frankenphp-mac-arm64`zend_execute.cold.1 + 348
    frame #11: 0x0000000101a76824 frankenphp-mac-arm64`zend_execute + 76
    frame #12: 0x0000000101b1e520 frankenphp-mac-arm64`zend_execute_script + 128
    frame #13: 0x00000001019b56ac frankenphp-mac-arm64`php_execute_script_ex + 592
    frame #14: 0x000000010131d4dc frankenphp-mac-arm64`frankenphp_execute_script + 292
    frame #15: 0x000000010131d36c frankenphp-mac-arm64`php_thread + 128
    frame #16: 0x0000000192677c08 libsystem_pthread.dylib`_pthread_start + 136