Description:
------------
If no custom error-handler is defined via set_error_handler() it works like I would expect it. If I pass an invalid argument to the constructor of DateTimeZone an exception is thrown with "Unknown or bad timezone (...)".
But as soon as I define a custom error-handler the behavior changes.
The creation of DateTimeZone causes no problem. But if I pass the created object to DateTime PHP crashes.

Reproduce code:
---------------
<?php
function handleError() {}
set_error_handler('handleError');

$t = new DateTimeZone('something');
$d = new DateTime('now',$t);
?>

Expected result:
----------------
Of course, PHP should not crash but trigger an error / throw an exception :)

Actual result:
--------------
I've tried to get the backtrace. I don't know if I've done this correctly. The howto linked on this page doesn't work for me. I've done the following:
$ gdb /usr/bin/php5
$(gdb) run myfile.php
$(gdb) bt

The result is:
Program received signal SIGSEGV, Segmentation fault.

#0  0x080dff87 in timelib_tzinfo_clone ()
#1  0x080c5e63 in zif_date_timezone_set ()
#2  0x082e0e32 in ?? ()
#3  0x00000001 in ?? ()
#4  0x086d1b30 in ?? ()
#5  0x00000000 in ?? ()