==7983== Memcheck, a memory error detector
==7983== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==7983== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==7983== Command: php -d xdebug.mode=develop ./test.php
==7983== 
/home/eater/test.php:3:
array(1) {
  [0] =>
  array(4) {
    'function' =>
    string(6) "{main}"
    'file' =>
    string(20) "/home/eater/test.php"
    'line' =>
    int(0)
    'params' =>
    array(0) {
    }
  }
}
==7983== Warning: client switching stacks?  SP change: 0x1ffeffbfe0 --> 0x6e47fc0
==7983==          to suppress, use: --max-stackframe=137306521632 or greater
/home/eater/test.php:5:
array(2) {
  [0] =>
  array(2) {
    'function' =>
    string(9) "{closure}"
    'args' =>
    array(0) {
    }
  }
  [1] =>
  array(7) {
    'file' =>
    string(20) "/home/eater/test.php"
    'line' =>
    int(9)
    'function' =>
    string(5) "start"
    'class' =>
    string(5) "Fiber"
    'object' =>
    class Fiber#1 (0) {
    }
    'type' =>
    string(2) "->"
    'args' =>
    array(0) {
    }
  }
}
==7983== Invalid read of size 1
==7983==    at 0x60FDA75: zend_string_copy (zend_string.h:191)
==7983==    by 0x60FDA75: zif_xdebug_get_function_stack (stack.c:1069)
==7983==    by 0x60D991C: xdebug_execute_internal (base.c:897)
==7983==    by 0x5D1B1B: ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER (zend_vm_execute.h:1872)
==7983==    by 0x5D1B1B: execute_ex (zend_vm_execute.h:54541)
==7983==    by 0x60D9081: xdebug_execute_ex (base.c:779)
==7983==    by 0x55A7CF: zend_call_function (zend_execute_API.c:896)
==7983==    by 0x5FD132: zend_fiber_execute (zend_fibers.c:475)
==7983==    by 0x5FDE66: zend_fiber_trampoline (zend_fibers.c:287)
==7983==  Address 0x4 is not stack'd, malloc'd or (recently) free'd
==7983== 
==7983== 
==7983== Process terminating with default action of signal 11 (SIGSEGV)
==7983==  Access not within mapped region at address 0x4
==7983==    at 0x60FDA75: zend_string_copy (zend_string.h:191)
==7983==    by 0x60FDA75: zif_xdebug_get_function_stack (stack.c:1069)
==7983==    by 0x60D991C: xdebug_execute_internal (base.c:897)
==7983==    by 0x5D1B1B: ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER (zend_vm_execute.h:1872)
==7983==    by 0x5D1B1B: execute_ex (zend_vm_execute.h:54541)
==7983==    by 0x60D9081: xdebug_execute_ex (base.c:779)
==7983==    by 0x55A7CF: zend_call_function (zend_execute_API.c:896)
==7983==    by 0x5FD132: zend_fiber_execute (zend_fibers.c:475)
==7983==    by 0x5FDE66: zend_fiber_trampoline (zend_fibers.c:287)
==7983==  If you believe this happened as a result of a stack
==7983==  overflow in your program's main thread (unlikely but
==7983==  possible), you can try to increase the size of the
==7983==  main thread stack using the --main-stacksize= flag.
==7983==  The main thread stack size used in this run was 8388608.
==7983== 
==7983== HEAP SUMMARY:
==7983==     in use at exit: 3,045,394 bytes in 23,119 blocks
==7983==   total heap usage: 25,596 allocs, 2,477 frees, 4,089,403 bytes allocated
==7983== 
==7983== LEAK SUMMARY:
==7983==    definitely lost: 28,280 bytes in 884 blocks
==7983==    indirectly lost: 1,065 bytes in 2 blocks
==7983==      possibly lost: 2,133,914 bytes in 17,183 blocks
==7983==    still reachable: 882,135 bytes in 5,050 blocks
==7983==         suppressed: 0 bytes in 0 blocks
==7983== Rerun with --leak-check=full to see details of leaked memory
==7983== 
==7983== For lists of detected and suppressed errors, rerun with: -s
==7983== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)