Redis Version 2.2.1 code: <?php $redis = new Redis(); $redis->pconnect('192.168.56.21',6666); $redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY); $redis->incr('xxxx'); for($i=0;$i<1000;$i++) { echo $i."\n"; $key = 'xxxx'; // $v=$redis->mGet(array($key)); //this does work $v=$redis->get($key); //this leads to segmenut } # backtrace Program received signal SIGSEGV, Segmentation fault. zend_mm_remove_from_free_list (heap=0xfa92d0, mm_block=0x1274a88) at /root/soft/php/php-5.3.15/Zend/zend_alloc.c:845 845 if (UNEXPECTED(prev->next_free_block != mm_block) || UNEXPECTED(next->prev_free_block != mm_block)) { (gdb) bt #0 zend_mm_remove_from_free_list (heap=0xfa92d0, mm_block=0x1274a88) at /root/soft/php/php-5.3.15/Zend/zend_alloc.c:845 #1 0x0000000000723fe1 in _zend_mm_free_int (heap=0xfa92d0, p=0x1271968) at /root/soft/php/php-5.3.15/Zend/zend_alloc.c:2029 #2 0x00007ffff1415de9 in igbinary_unserialize_data_deinit (buf=0x1271d70 "11", buf_len=2, z=0x7fffffffaba8) ``` at /root/soft/php/nicolasff-phpredis-f3dff08/igbinary/igbinary.c:1165 ``` #3 igbinary_unserialize (buf=0x1271d70 "11", buf_len=2, z=0x7fffffffaba8) ``` at /root/soft/php/nicolasff-phpredis-f3dff08/igbinary/igbinary.c:290 ``` #4 0x00007ffff14080dc in redis_unserialize (redis_sock=<value optimized out>, val=0x1271d70 "11", val_len=<value optimized out>, ``` return_value=0x7fffffffaba8) at /root/soft/php/nicolasff-phpredis-f3dff08/library.c:1353 ``` #5 0x00007ffff140ba98 in redis_string_response (ht=<value optimized out>, return_value=0x1270c50, return_value_ptr=<value optimized out>, ``` this_ptr=<value optimized out>, return_value_used=<value optimized out>, redis_sock=0x1271ff0, z_tab=0x0, ctx=0x0) at /root/soft/php/nicolasff-phpredis-f3dff08/library.c:780 ``` #6 0x00007ffff13feab7 in zim_Redis_get (ht=1, return_value=0x1270c50, return_value_ptr=0x0, this_ptr=0x126ef30, return_value_used=1) ``` at /root/soft/php/nicolasff-phpredis-f3dff08/redis.c:1078 ``` #7 0x000000000078bd00 in zend_do_fcall_common_helper_SPEC (execute_data=0x7fffef726050) ``` at /root/soft/php/php-5.3.15/Zend/zend_vm_execute.h:320 ``` #8 0x0000000000764408 in execute (op_array=0x126f6e8) at /root/soft/php/php-5.3.15/Zend/zend_vm_execute.h:107 #9 0x000000000073f42a in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /root/soft/php/php-5.3.15/Zend/zend.c:1236 #10 0x00000000006ee34e in php_execute_script (primary_file=0x7fffffffe250) at /root/soft/php/php-5.3.15/main/main.c:2308 #11 0x00000000007c8284 in main (argc=2, argv=0x7fffffffe4c8) at /root/soft/php/php-5.3.15/sapi/cli/php_cli.c:1189