<?php
$t = new \Google\Protobuf\Timestamp();
$tNew = clone $t;
$tNew->serializeToJsonString();

Thread 1 "php" received signal SIGSEGV, Segmentation fault.
0x00007ffff49aa1c6 in zim_Message_serializeToJsonString (execute_data=0x7ffff4e140f0, return_value=0x7fffffffa2b0)
    at /build/protobuf-3.14.0/message.c:750
750       size = upb_json_encode(intern->msg, intern->desc->msgdef,
(gdb) bt
#0  0x00007ffff49aa1c6 in zim_Message_serializeToJsonString (execute_data=0x7ffff4e140f0, return_value=0x7fffffffa2b0)
    at /build/protobuf-3.14.0/message.c:750
#1  0x0000000000741b62 in execute_ex ()
#2  0x0000000000743f13 in zend_execute ()
#3  0x00000000006ab6fd in zend_execute_scripts ()
#4  0x000000000063f48c in php_execute_script ()
#5  0x0000000000746495 in do_cli ()
#6  0x0000000000441cd5 in main ()
#7  0x00007ffff569aa35 in __libc_start_main () from /lib64/libc.so.6
#8  0x0000000000442442 in _start ()
(gdb) p *intern
$1 = {std = {gc = {refcount = 2, u = {type_info = 24}}, handle = 5, ce = 0x7ffff4e043b0, handlers = 0xbff7c0 <std_object_handlers>, properties = 0x0, 
    properties_table = {{value = {lval = 140737302307656, dval = 6.9533466158586819e-310, counted = 0x7ffff4e92348, str = 0x7ffff4e92348, 
          arr = 0x7ffff4e92348, obj = 0x7ffff4e92348, res = 0x7ffff4e92348, ref = 0x7ffff4e92348, ast = 0x7ffff4e92348, zv = 0x7ffff4e92348, 
          ptr = 0x7ffff4e92348, ce = 0x7ffff4e92348, func = 0x7ffff4e92348, ww = {w1 = 4108919624, w2 = 32767}}, u1 = {v = {type = 222 '\336', 
            type_flags = 56 '8', u = {extra = 29593}}, type_info = 1939421406}, u2 = {next = 2149246759, cache_slot = 2149246759, opline_num = 2149246759, 
          lineno = 2149246759, num_args = 2149246759, fe_pos = 2149246759, fe_iter_idx = 2149246759, access_flags = 2149246759, property_guard = 2149246759, 
          constant_flags = 2149246759, extra = 2149246759}}}}, arena = {value = {lval = 8, dval = 3.9525251667299724e-323, counted = 0x8, str = 0x8, 
      arr = 0x8, obj = 0x8, res = 0x8, ref = 0x8, ast = 0x8, zv = 0x8, ptr = 0x8, ce = 0x8, func = 0x8, ww = {w1 = 8, w2 = 0}}, u1 = {v = {type = 105 'i', 
        type_flags = 110 'n', u = {extra = 29801}}, type_info = 1953066601}, u2 = {next = 1701015151, cache_slot = 1701015151, opline_num = 1701015151, 
      lineno = 1701015151, num_args = 1701015151, fe_pos = 1701015151, fe_iter_idx = 1701015151, access_flags = 1701015151, property_guard = 1701015151, 
      constant_flags = 1701015151, extra = 1701015151}}, desc = 0x66756200610000, msg = 0x7ffff4e92370}
(gdb) p *intern.desc
Cannot access memory at address 0x66756200610000