Description:
------------
httpd ( Apache 2.2 ) crashes below messages.

> httpd in free(): error: recursive call
> [notice] child pid XXXXX exit signal Abort trap (6)

XXXXX is process id of a httpd child process.

Reproduce code:
---------------
sorry, I could't repro this bug in another environment.

Actual result:
--------------
this is backtrace.

Program received signal SIGABRT, Aborted.
0x2836b56f in kill () from /lib/libc.so.6
(gdb) bt
#0  0x2836b56f in kill () from /lib/libc.so.6
#1  0x2828d27b in raise () from /usr/lib/libpthread.so.2
#2  0x2836a2ab in abort () from /lib/libc.so.6
 :
#6  0x2830662c in free () from /lib/libc.so.6
#7  0x28617828 in php_error_cb (type=1,
    error_filename=0x86b1e38 "/usr/home/hossy/public_html/test.php", error_lineno=391,
    format=0x2874febc "Maximum execution time of %d second%s exceeded", args=0xbfbf7898 "\n")
    at /usr/ports/lang/php5/work/php-5.2.9/main/main.c:824
 :
#10 0x282920d3 in sigaction () from /usr/lib/libpthread.so.2
#11 <signal handler called>
 :
#15 0x2830662c in free () from /lib/libc.so.6
#16 0x28644cb5 in zend_mm_mem_malloc_free (storage=0x80a1690, ptr=0xa81c000)
    at /usr/ports/lang/php5/work/php-5.2.9/Zend/zend_alloc.c:276
 :

1. httpd cought SIGPROF in free() because of `max_execution_time' parameter.
2. php_error_cb() called free()
3. free() detected as `recursive call.'

in zend_mm_mem_malloc_free(), signal is blocked from HANDLE_BLOCK_INTERRUPTIONS macro.
but, apache2handler does't have the function for it.

(gdb) p zend_block_interruptions
$1 = (void (*)(void)) 0
(gdb) p sapi_module
$2 = {name = 0x28759d5d "apache2handler", pretty_name = 0x28759d6c "Apache 2.0 Handler",
 :
  block_interruptions = 0, unblock_interruptions = 0,
 :
(gdb) p apache2_sapi_module
$3 = {name = 0x28759d5d "apache2handler", pretty_name = 0x28759d6c "Apache 2.0 Handler",
 :
  block_interruptions = 0, unblock_interruptions = 0,
 :

in japanese mailing list, I got a patch for this problem.
http://ml.php.gr.jp/pipermail/php-dev/2009-March/001453.html