Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

Done. The output:

Reading symbols from /home/flav/php-5.3.0/sapi/cli/php...done.
(gdb) run /usr/bin/phpunit --bootstrap bootstrap.php --configuration phpunit.xml testunit/
Starting program: /home/flav/php-5.3.0/sapi/cli/php /usr/bin/phpunit --bootstrap bootstrap.php --configuration phpunit.xml testunit/
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x00000000007d93db in ZEND_ADD_INTERFACE_SPEC_CONST_HANDLER (execute_data=0x7ffff65529a8) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:892
892             if (!(iface->ce_flags & ZEND_ACC_INTERFACE)) {
(gdb) bt
#0  0x00000000007d93db in ZEND_ADD_INTERFACE_SPEC_CONST_HANDLER (execute_data=0x7ffff65529a8) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:892
#1  0x00000000007d6b50 in execute (op_array=0x161f078) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:104
#2  0x00000000007a38de in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/flav/php-5.3.0/Zend/zend.c:1188
#3  0x000000000072ed19 in php_execute_script (primary_file=0x7fffffffe1e0) at /home/flav/php-5.3.0/main/main.c:2196
#4  0x000000000088c885 in main (argc=7, argv=0x7fffffffe438) at /home/flav/php-5.3.0/sapi/cli/php_cli.c:1188

After some debugging, I came to the conclusion that it crashes because of an exception being thrown inside a spl_register_autoload()'ed userland method.

Here's the bt:

#0  zend_lookup_class_ex (name=0x15b9d40 "Exception", name_length=9, use_autoload=1, ce=0x7fffffffb2e0) at /home/flav/php-5.3.0/Zend/zend_execute_API.c:1016
#1  0x00000000007954d1 in zend_fetch_class (class_name=0x15b9d40 "Exception", class_name_len=9, fetch_type=4)
    at /home/flav/php-5.3.0/Zend/zend_execute_API.c:1524
#2  0x00000000007d8d22 in ZEND_FETCH_CLASS_SPEC_CONST_HANDLER (execute_data=0x7ffff6552cc0) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:724
#3  0x00000000007d6b50 in execute (op_array=0x15bc828) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:104
#4  0x00000000007940e5 in zend_call_function (fci=0x7fffffffb640, fci_cache=0x7fffffffb5d0) at /home/flav/php-5.3.0/Zend/zend_execute_API.c:936
#5  0x00000000007bfae4 in zend_call_method (object_pp=0x0, obj_ce=0x15b8eb0, fn_proxy=0x15b09f8, function_name=0x15ba410 "\\yap\\base::autoload",
    function_name_len=20, retval_ptr_ptr=0x7fffffffb748, param_count=1, arg1=0x15f8930, arg2=0x0) at /home/flav/php-5.3.0/Zend/zend_interfaces.c:97
#6  0x0000000000600de0 in zif_spl_autoload_call (ht=1, return_value=0x161c620, return_value_ptr=0x7fffffffba70, this_ptr=0x0, return_value_used=1)
    at /home/flav/php-5.3.0/ext/spl/php_spl.c:395
#7  0x00000000007942c2 in zend_call_function (fci=0x7fffffffba20, fci_cache=0x7fffffffb9f0) at /home/flav/php-5.3.0/Zend/zend_execute_API.c:958
#8  0x0000000000794999 in zend_lookup_class_ex (name=0x15f8a30 "YAP\\patterns\\IInheritable", name_length=25, use_autoload=1, ce=0x7fffffffbb20)
    at /home/flav/php-5.3.0/Zend/zend_execute_API.c:1089
#9  0x00000000007954d1 in zend_fetch_class (class_name=0x15f8a30 "YAP\\patterns\\IInheritable", class_name_len=25, fetch_type=6)
    at /home/flav/php-5.3.0/Zend/zend_execute_API.c:1524
#10 0x00000000007d93d3 in ZEND_ADD_INTERFACE_SPEC_CONST_HANDLER (execute_data=0x7ffff6552bb8) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:890
#11 0x00000000007d6b50 in execute (op_array=0x15f68c8) at /home/flav/php-5.3.0/Zend/zend_vm_execute.h:104
#12 0x00000000007a38de in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/flav/php-5.3.0/Zend/zend.c:1188
#13 0x000000000072ed19 in php_execute_script (primary_file=0x7fffffffe1b0) at /home/flav/php-5.3.0/main/main.c:2196
#14 0x000000000088c885 in main (argc=7, argv=0x7fffffffe408) at /home/flav/php-5.3.0/sapi/cli/php_cli.c:1188

Sorry for the incomplete post.

This happens in my scripts because it's trying to autoload an interface.
My code was indeed buggy, but I woudn't expect PHP to crash.

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

Could someone do something with this report?

Please try using this snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/

There was a fix for autoload crashing on an interface in bug #49908

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

Please try using this snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".