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Thread 1 (Thread 0x7f3b9beaa740 (LWP 12536)):
#0  0x00007f3b9b067445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f3b9b06abab in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2  0x00007f3b9b0a4e2e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#3  0x00007f3b9b0af626 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#4  0x00007f3b982d6715 in destroy_zend_class () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#5  0x00007f3b982ee3b0 in zend_hash_clean () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#6  0x00007f3b8e4d5f90 in apc_interned_strings_shutdown () from /usr/lib/php5/20100525/apc.so
No symbol table info available.
#7  0x00007f3b8e4cf8aa in apc_module_shutdown () from /usr/lib/php5/20100525/apc.so
No symbol table info available.
#8  0x00007f3b8e4c4d4f in ?? () from /usr/lib/php5/20100525/apc.so
No symbol table info available.
#9  0x00007f3b982e78c3 in ?? () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#10 0x00007f3b982ecc95 in ?? () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#11 0x00007f3b982ee488 in zend_hash_graceful_reverse_destroy () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#12 0x00007f3b982e014e in ?? () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#13 0x00007f3b982810fa in php_module_shutdown () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#14 0x00007f3b982811b9 in php_module_shutdown_wrapper () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#15 0x00007f3b98389291 in ?? () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#16 0x00007f3b9b629e08 in ?? () from /usr/lib/libapr-1.so.0
No symbol table info available.
#17 0x00007f3b9b628c1d in apr_pool_destroy () from /usr/lib/libapr-1.so.0
No symbol table info available.
#18 0x00007f3b9b628c00 in apr_pool_destroy () from /usr/lib/libapr-1.so.0
No symbol table info available.
#19 0x00007f3b9bef565d in ?? ()
No symbol table info available.
#20 0x00007f3b9bef54b6 in main ()
No symbol table info available.