$ valgrind --tool=memcheck php corruption.php
==8365== Memcheck, a memory error detector
==8365== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==8365== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
==8365== Command: php corruption.php
==8365==
==8365== Invalid read of size 4
==8365==    at 0x820A6ED: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf58 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x820A6F3: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf58 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid write of size 1
==8365==    at 0x820A760: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf5d is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 1
==8365==    at 0x820A766: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf5c is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 1
==8365==    at 0x823867F: gc_zval_possible_root (in /usr/bin/php)
==8365==    by 0x820A758: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf5c is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x82386F0: gc_zval_possible_root (in /usr/bin/php)
==8365==    by 0x820A758: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf50 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823856E: gc_zobj_possible_root (in /usr/bin/php)
==8365==    by 0x8238703: gc_zval_possible_root (in /usr/bin/php)
==8365==    by 0x820A758: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf54 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x8238588: gc_zobj_possible_root (in /usr/bin/php)
==8365==    by 0x8238703: gc_zval_possible_root (in /usr/bin/php)
==8365==    by 0x820A758: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf50 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x820A707: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf60 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 1
==8365==    at 0x820A71A: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf5c is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 1
==8365==    at 0x82189AB: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf5c is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x82189F8: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf54 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823DE8B: zend_objects_store_del_ref (in /usr/bin/php)
==8365==    by 0x8218A00: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf50 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823DE8D: zend_objects_store_del_ref (in /usr/bin/php)
==8365==    by 0x8218A00: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf58 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823DE91: zend_objects_store_del_ref (in /usr/bin/php)
==8365==    by 0x8218A00: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf54 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823DEA6: zend_objects_store_del_ref (in /usr/bin/php)
==8365==    by 0x8218A00: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf58 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x823DEB4: zend_objects_store_del_ref (in /usr/bin/php)
==8365==    by 0x8218A00: _zval_dtor_func (in /usr/bin/php)
==8365==    by 0x820A727: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf50 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid read of size 4
==8365==    at 0x81F89A1: ??? (in /usr/bin/php)
==8365==    by 0x820A731: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf48 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365== Invalid write of size 4
==8365==    at 0x81F89CC: ??? (in /usr/bin/php)
==8365==    by 0x820A731: _zval_ptr_dtor (in /usr/bin/php)
==8365==    by 0x8226CFE: zend_hash_destroy (in /usr/bin/php)
==8365==    by 0x8239B93: zend_object_std_dtor (in /usr/bin/php)
==8365==    by 0x8239BD2: zend_objects_free_object_storage (in /usr/bin/php)
==8365==    by 0x823D985: zend_objects_store_free_object_storage (in /usr/bin/php)
==8365==    by 0x820ADF4: ??? (in /usr/bin/php)
==8365==    by 0x8219A4F: ??? (in /usr/bin/php)
==8365==    by 0x81BFC0C: php_request_shutdown (in /usr/bin/php)
==8365==    by 0x82B3A71: ??? (in /usr/bin/php)
==8365==    by 0x403EE35: (below main) (in /lib/libc-2.13.so)
==8365==  Address 0xbefeaf50 is not stack'd, malloc'd or (recently) free'd
==8365==
==8365==
==8365== HEAP SUMMARY:
==8365==     in use at exit: 85,004 bytes in 2,145 blocks
==8365==   total heap usage: 20,680 allocs, 18,535 frees, 2,514,693 bytes allocated
==8365==
==8365== LEAK SUMMARY:
==8365==    definitely lost: 2,253 bytes in 31 blocks
==8365==    indirectly lost: 2,148 bytes in 49 blocks
==8365==      possibly lost: 0 bytes in 0 blocks
==8365==    still reachable: 80,603 bytes in 2,065 blocks
==8365==         suppressed: 0 bytes in 0 blocks
==8365== Rerun with --leak-check=full to see details of leaked memory
==8365==
==8365== For counts of detected and suppressed errors, rerun with: -v
==8365== ERROR SUMMARY: 25 errors from 19 contexts (suppressed: 217 from 13)