Description:
------------
Looped forward_static_call causes segfault on PHP 5.4.15, 5.5.0RC2 and on trunk 
(20130523).

Configure for PHP 5.5.0RC2 and trunk: ./configure --enable-debug

Worth noting: xdebug extension prevented crash and exited PHP cleanly.

Backtrace is extremely long, here are ten first entries:

#0  0x00000000007896d1 in _zend_mm_alloc_int (heap=<error reading variable: 
Cannot access memory at address 
0x7fffff7fefe8>, 
    size=<error reading variable: Cannot access memory at address 
0x7fffff7fefe0>, __zend_filename=<error 
reading variable: Cannot access memory at address 0x7fffff7fefd8>, 
    __zend_lineno=<error reading variable: Cannot access memory at address 
0x7fffff7fefd4>, 
    __zend_orig_filename=<error reading variable: Cannot access memory at 
address 0x7fffff7fefc8>, 
    __zend_orig_lineno=<error reading variable: Cannot access memory at address 
0x7fffff7fefd0>)
    at <removed>/Zend/zend_alloc.c:1881
#1  0x000000000078b3f3 in _emalloc (size=4, __zend_filename=0xbd7e38 "
<removed>/Zend/zend_operators.c", 
__zend_lineno=1979, 
    __zend_orig_filename=0x0, __zend_orig_lineno=0) at 
<removed>/Zend/zend_alloc.c:2429
#2  0x00000000007bec56 in zend_str_tolower_dup (source=0x7ffff7e95ac0 
"foo::bar", length=3) at 
<removed>/Zend/zend_operators.c:1979
#3  0x00000000007ce357 in zend_is_callable_check_class (name=0x7ffff7e95ac0 
"foo::bar", name_len=3, 
fcc=0x7fffff7ff720, strict_class=0x7fffff7ff168, error=0x7fffff7ff368)
    at <removed>/Zend/zend_API.c:2673
#4  0x00000000007cea6e in zend_is_callable_check_func (check_flags=0, 
callable=0x7ffff5b4dbc8, 
fcc=0x7fffff7ff720, strict_class=0, error=0x7fffff7ff368)
    at <removed>/Zend/zend_API.c:2795
#5  0x00000000007cfc75 in zend_is_callable_ex (callable=0x7ffff5b4dbc8, 
object_ptr=0x0, check_flags=0, 
callable_name=0x0, callable_name_len=0x7fffff7ff294, 
    fcc=0x7fffff7ff720, error=0x7fffff7ff368) at <removed>/Zend/zend_API.c:3059
#6  0x00000000007d0710 in zend_fcall_info_init (callable=0x7ffff5b4dbc8, 
check_flags=0, fci=0x7fffff7ff750, 
fcc=0x7fffff7ff720, callable_name=0x0, error=0x7fffff7ff368)
    at <removed>/Zend/zend_API.c:3235
#7  0x00000000007c6d89 in zend_parse_arg_impl (arg_num=1, arg=0x7ffff5bab758, 
va=0x7fffff7ff610, 
spec=0x7fffff7ff540, error=0x7fffff7ff4e8, severity=0x7fffff7ff4e4)
    at <removed>/Zend/zend_API.c:632
#8  0x00000000007c7061 in zend_parse_arg (arg_num=1, arg=0x7ffff5bab758, 
va=0x7fffff7ff610, 
spec=0x7fffff7ff540, quiet=0)
    at <removed>/Zend/zend_API.c:691
#9  0x00000000007c787c in zend_parse_va_args (num_args=0, type_spec=0xbaabcb 
"f*", va=0x7fffff7ff610, flags=0)
    at <removed>/Zend/zend_API.c:873
#10 0x00000000007c7b4f in zend_parse_parameters (num_args=1, type_spec=0xbaabcb 
"f*") at 
<removed>/Zend/zend_API.c:924


Test script:
---------------
Example case: http://jutaky.com/fuzzing/loopz.html

Expected result:
----------------
Possibly looping until killed, reaching max_execution_time or other PHP set limit 
is reached?

Actual result:
--------------
Segmentation fault.