Fibers appear to be broken on FreeBSD i386

[arnaud-lb]

Description

Not sure that this is a supported platform, but fibers appear to be broken on FreeBSD i386.

The following code:

<?php

$fiber = new Fiber(function() {
});

$fiber->start();

Resulted in this output:

Segmentation fault (core dumped)

But I expected this output instead:

gdb:

gdb --args sapi/cli/php test.php
(gdb) r
Starting program: sapi/cli/php test.php

Program received signal SIGSEGV, Segmentation fault.
Address not mapped to object.
jump_fcontext () at Zend/asm/jump_i386_sysv_elf_gas.S:60
60	    movl  %ecx, (%eax)
(gdb) list
55	    movl  %eax, %esp
56	
57	    /* address of returned transport_t */
58	    movl 0x1c(%esp), %eax
59	    /* return parent fcontext_t */
60	    movl  %ecx, (%eax)
61	    /* return data */
62	    movl %edx, 0x4(%eax)
63	
64	    movl  0x18(%esp), %ecx  /* restore EIP */
(gdb) bt
#0  jump_fcontext () at Zend/asm/jump_i386_sysv_elf_gas.S:60
#1  0x21059000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

PHP Version

master 17b0e49

Operating System

FreeBSD 13.0 i386