php segfault

Program received signal SIGSEGV, Segmentation fault.
0x00000000006b10ff in _zend_hash_add_or_update ()
(gdb) bt
#0  0x00000000006b10ff in _zend_hash_add_or_update ()
#1  0x00000000006a7878 in add_assoc_stringl_ex ()
#2  0x00007fffe8b7e3a3 in ?? () from /usr/lib/php5/20100525/memcache.so
#3  0x00007fffe8b7e7b7 in ?? () from /usr/lib/php5/20100525/memcache.so
#4  0x00007fffe8b84e74 in ?? () from /usr/lib/php5/20100525/memcache.so
#5  0x00007fffe8b82813 in mmc_pool_select () from /usr/lib/php5/20100525/memcache.so
#6  0x00007fffe8b83288 in mmc_pool_run () from /usr/lib/php5/20100525/memcache.so
#7  0x00007fffe8b7d27a in zif_memcache_get_extended_stats () from /usr/lib/php5/20100525/memcache.so
#8  0x00007fffefb9d2c5 in xdebug_execute_internal (current_execute_data=0x7ffff7f9c3e8, return_value_used=1) at /tmp/pear/temp/xdebug/xdebug.c:1547
#9  0x000000000074b921 in ?? ()
#10 0x000000000070549f in execute ()
#11 0x00007fffefb9e013 in xdebug_execute (op_array=0x7fffe50dda18) at /tmp/pear/temp/xdebug/xdebug.c:1435
#12 0x000000000074c05e in ?? ()
#13 0x000000000070549f in execute ()
#14 0x00007fffefb9e013 in xdebug_execute (op_array=0x7fffe50c3738) at /tmp/pear/temp/xdebug/xdebug.c:1435
#15 0x000000000074c05e in ?? ()
#16 0x000000000070549f in execute ()
#17 0x00007fffefb9e013 in xdebug_execute (op_array=0x7fffe5082c20) at /tmp/pear/temp/xdebug/xdebug.c:1435
#18 0x000000000074c05e in ?? ()
#19 0x000000000070549f in execute ()
#20 0x00007fffefb9e013 in xdebug_execute (op_array=0x7fffe5051c08) at /tmp/pear/temp/xdebug/xdebug.c:1435
#21 0x000000000074c05e in ?? ()
#22 0x000000000070549f in execute ()
#23 0x00007fffefb9e013 in xdebug_execute (op_array=0x7fffe50cb6c0) at /tmp/pear/temp/xdebug/xdebug.c:1435
#24 0x000000000074c05e in ?? ()
#25 0x000000000070549f in execute ()
#26 0x00007fffefb9e013 in xdebug_execute (op_array=0x1c4cad0) at /tmp/pear/temp/xdebug/xdebug.c:1435
#27 0x000000000074c05e in ?? ()
#28 0x000000000070549f in execute ()
#29 0x00007fffefb9e013 in xdebug_execute (op_array=0x1c49c48) at /tmp/pear/temp/xdebug/xdebug.c:1435
#30 0x000000000074c05e in ?? ()
#31 0x000000000070549f in execute ()
#32 0x00007fffefb9e013 in xdebug_execute (op_array=0x1a17fb0) at /tmp/pear/temp/xdebug/xdebug.c:1435
#33 0x000000000074c05e in ?? ()
#34 0x000000000070549f in execute ()
#35 0x00007fffefb9e013 in xdebug_execute (op_array=0x19efff8) at /tmp/pear/temp/xdebug/xdebug.c:1435
#36 0x000000000074c05e in ?? ()
#37 0x000000000070549f in execute ()
#38 0x00007fffefb9e013 in xdebug_execute (op_array=0x19c3f18) at /tmp/pear/temp/xdebug/xdebug.c:1435
#39 0x000000000074c05e in ?? ()
#40 0x000000000070549f in execute ()
#41 0x00007fffefb9e013 in xdebug_execute (op_array=0x19a0658) at /tmp/pear/temp/xdebug/xdebug.c:1435
#42 0x000000000074c05e in ?? ()
#43 0x000000000070549f in execute ()
#44 0x00007fffefb9e013 in xdebug_execute (op_array=0x19a8dd8) at /tmp/pear/temp/xdebug/xdebug.c:1435
#45 0x000000000074c05e in ?? ()
#46 0x000000000070549f in execute ()
#47 0x00007fffefb9e013 in xdebug_execute (op_array=0x19a8fd8) at /tmp/pear/temp/xdebug/xdebug.c:1435
#48 0x000000000074c05e in ?? ()
#49 0x000000000070549f in execute ()
#50 0x00007fffefb9e013 in xdebug_execute (op_array=0x161f680) at /tmp/pear/temp/xdebug/xdebug.c:1435
#51 0x0000000000695f58 in zend_call_function ()
#52 0x000000000053e122 in ?? ()
#53 0x00007fffefb9d2c5 in xdebug_execute_internal (current_execute_data=0x7ffff7f95ef0, return_value_used=1) at /tmp/pear/temp/xdebug/xdebug.c:1547
#54 0x000000000074b921 in ?? ()
---Type <return> to continue, or q <return> to quit---
#55 0x000000000070549f in execute ()
#56 0x00007fffefb9e013 in xdebug_execute (op_array=0x1629e58) at /tmp/pear/temp/xdebug/xdebug.c:1435
#57 0x000000000074c05e in ?? ()
#58 0x000000000070549f in execute ()
#59 0x00007fffefb9e013 in xdebug_execute (op_array=0x1629cf8) at /tmp/pear/temp/xdebug/xdebug.c:1435
#60 0x000000000074c05e in ?? ()
#61 0x000000000070549f in execute ()
#62 0x00007fffefb9e013 in xdebug_execute (op_array=0x17a1540) at /tmp/pear/temp/xdebug/xdebug.c:1435
#63 0x000000000074c05e in ?? ()
#64 0x000000000070549f in execute ()
#65 0x00007fffefb9e013 in xdebug_execute (op_array=0x1629b98) at /tmp/pear/temp/xdebug/xdebug.c:1435
#66 0x000000000074c05e in ?? ()
#67 0x000000000070549f in execute ()
#68 0x00007fffefb9e013 in xdebug_execute (op_array=0x1748a68) at /tmp/pear/temp/xdebug/xdebug.c:1435
#69 0x000000000074c05e in ?? ()
#70 0x000000000070549f in execute ()
#71 0x00007fffefb9e013 in xdebug_execute (op_array=0x1744878) at /tmp/pear/temp/xdebug/xdebug.c:1435
#72 0x000000000074c05e in ?? ()
#73 0x000000000070549f in execute ()
#74 0x00007fffefb9e013 in xdebug_execute (op_array=0x15cdbb0) at /tmp/pear/temp/xdebug/xdebug.c:1435
#75 0x000000000074c05e in ?? ()
#76 0x000000000070549f in execute ()
#77 0x00007fffefb9e013 in xdebug_execute (op_array=0x7ffff7fc7dd8) at /tmp/pear/temp/xdebug/xdebug.c:1435
#78 0x000000000074c05e in ?? ()
#79 0x000000000070549f in execute ()
#80 0x00007fffefb9e013 in xdebug_execute (op_array=0x7ffff7fc4b80) at /tmp/pear/temp/xdebug/xdebug.c:1435
#81 0x000000000074c05e in ?? ()
#82 0x000000000070549f in execute ()
#83 0x00007fffefb9e013 in xdebug_execute (op_array=0x7ffff7fc2358) at /tmp/pear/temp/xdebug/xdebug.c:1435
#84 0x00000000006a4ba8 in zend_execute_scripts ()
#85 0x0000000000644063 in php_execute_script ()
#86 0x000000000074db9f in ?? ()
#87 0x000000000042cf1e in ?? ()
#88 0x00007ffff58c876d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#89 0x000000000042cfb5 in _start ()