Description:
------------
Tangentially related to https://bugs.php.net/bug.php?id=69566

I've been working on a PHP extension that includes a trait: https://github.com/jbboehr/php-psr/tree/php7

On git master, I get a sigabort.

I'm not sure why normal traits don't get the invalid free; maybe they're all allocated by arena.

In zend_add_trait_method, the internal function struct is not the same size as a user function, so valgrind outputs an invalid read warning.

As an aside, assuming allowing traits in an extension is something that should be supported, it might be ideal to have at least one internal trait somewhere to catch these sort of issues, but that's outside the scope of this bug report.

Test script:
---------------
Unfortunately, it's in an extension, so to reproduce compile https://github.com/jbboehr/php-psr/tree/php7 and run
TEST_PHP_ARGS=-m make test

Actual result:
--------------
Valgrind output:

==15151== Invalid read of size 8
==15151==    at 0x8FA68D: zend_traits_copy_functions (zend_inheritance.c:1184)
==15151==    by 0x8FB15F: zend_do_traits_method_binding (zend_inheritance.c:1387)
==15151==    by 0x8FBA08: zend_do_bind_traits (zend_inheritance.c:1588)
==15151==    by 0x907AD1: ZEND_BIND_TRAITS_SPEC_HANDLER (zend_vm_execute.h:1451)
==15151==    by 0x903F0F: execute_ex (zend_vm_execute.h:394)
==15151==    by 0x9040D3: zend_execute (zend_vm_execute.h:434)
==15151==    by 0x8A73B4: zend_execute_scripts (zend.c:1389)
==15151==    by 0x7F79CA: php_execute_script (main.c:2468)
==15151==    by 0x972711: do_cli (php_cli.c:967)
==15151==    by 0x973A30: main (php_cli.c:1334)
==15151==  Address 0xd919a70 is 0 bytes after a block of size 64 alloc'd
==15151==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15151==    by 0x8B1B93: zend_register_functions (zend_API.c:2272)
==15151==    by 0x8B31C1: do_register_internal_class (zend_API.c:2687)
==15151==    by 0x8B33AD: zend_register_internal_class (zend_API.c:2735)
==15151==    by 0xE247F2E: php_psr_register_LoggerTrait (psr.c:308)
==15151==    by 0xE24823C: zm_startup_psr (psr.c:360)
==15151==    by 0x8B0362: zend_startup_module_ex (zend_API.c:1878)
==15151==    by 0x8B03E0: zend_startup_module_zval (zend_API.c:1893)
==15151==    by 0x8BE50F: zend_hash_apply (zend_hash.c:1437)
==15151==    by 0x8B09F7: zend_startup_modules (zend_API.c:2004)
==15151==    by 0x7F6ECD: php_module_startup (main.c:2190)
==15151==    by 0x97136A: php_cli_startup (php_cli.c:419)
==15151== 
==15151== Invalid free() / delete / delete[] / realloc()
==15151==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15151==    by 0x892466: zend_function_dtor (zend_opcode.c:128)
==15151==    by 0x8BDA20: zend_hash_destroy (zend_hash.c:1182)
==15151==    by 0x892DD5: destroy_zend_class (zend_opcode.c:285)
==15151==    by 0x8BD103: _zend_hash_del_el_ex (zend_hash.c:938)
==15151==    by 0x8BD1E3: _zend_hash_del_el (zend_hash.c:962)
==15151==    by 0x8BE978: zend_hash_reverse_apply (zend_hash.c:1532)
==15151==    by 0x88BFFF: shutdown_executor (zend_execute_API.c:351)
==15151==    by 0x8A5C7A: zend_deactivate (zend.c:964)
==15151==    by 0x7F60C1: php_request_shutdown (main.c:1806)
==15151==    by 0x973110: do_cli (php_cli.c:1135)
==15151==    by 0x973A30: main (php_cli.c:1334)
==15151==  Address 0xd9bb498 is 4,568 bytes inside a block of size 65,536 alloc'd
==15151==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15151==    by 0x86E752: _emalloc (zend_alloc.c:2195)
==15151==    by 0x870240: zend_arena_create (zend_arena.h:36)
==15151==    by 0x8714A1: init_compiler (zend_compile.c:324)
==15151==    by 0x8A5ACD: zend_activate (zend.c:940)
==15151==    by 0x7F4F3D: php_request_startup (main.c:1564)
==15151==    by 0x972542: do_cli (php_cli.c:938)
==15151==    by 0x973A30: main (php_cli.c:1334)
==15151==