I'm able to reproduce the same thing with Xtrabackup 2.1.9 version. mysql> select count(*) from nil_test where city = 'ahmedabad' and phone = '12345'; ERROR 2013 (HY000): Lost connection to MySQL server during query mysql> show create table nil_test \G ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 2 Current database: test *************************** 1. row *************************** Table: nil_test Create Table: CREATE TABLE `nil_test` ( `id` int(11) DEFAULT NULL, `name` varchar(10) DEFAULT NULL, `city` varchar(10) DEFAULT NULL, `phone` int(11) DEFAULT NULL, KEY `city_phone` (`city`,`phone`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 row in set (0.01 sec) mysql> quit InnoDB: Page directory corruption: infimum not pointed to 2014-07-02 12:50:30 7f7559d78700 InnoDB: Page dump in ascii and hex (16384 bytes): InnoDB: End of page dump 2014-07-02 12:50:31 7f7559d78700 InnoDB: uncompressed page, stored checksum in field1 3735928559, calculated checksums for field1: crc32 177807968, innodb 3475755373, none 3735928559, stored checksum in field2 3735928559, calculated checksums for field2: crc32 177807968, innodb 1624572976, none 3735928559, page LSN 0 0, low 4 bytes of LSN at page end 0, page number (if stored to page already) 0, space id (if created with >= MySQL-4.1.1 and stored already) 0 InnoDB: Page may be a freshly allocated page 07:20:31 UTC - mysqld got signal 11 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. Please help us make Percona Server better by reporting any bugs at http://bugs.percona.com/ key_buffer_size=16777216 read_buffer_size=131072 max_used_connections=3 max_threads=153 thread_count=2 connection_count=2 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 77355 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f758cacc030 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 7f7559d77e40 thread_stack 0x30000 /usr/sbin/mysqld(my_print_stacktrace+0x2c)[0x7f758aedf62c] /usr/sbin/mysqld(handle_fatal_signal+0x3cb)[0x7f758ac2caab] /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340)[0x7f75890f6340] /usr/sbin/mysqld(+0x816684)[0x7f758afe1684] /usr/sbin/mysqld(+0x7f8329)[0x7f758afc3329] /usr/sbin/mysqld(+0x8a2d32)[0x7f758b06dd32] /usr/sbin/mysqld(+0x8a9228)[0x7f758b074228] /usr/sbin/mysqld(+0x79b277)[0x7f758af66277] /usr/sbin/mysqld(_ZN7handler27multi_range_read_info_constEjP15st_range_seq_ifPvjPjS3_P13Cost_estimate+0xcf)[0x7f758ab57daf] /usr/sbin/mysqld(_ZN10DsMrr_impl16dsmrr_info_constEjP15st_range_seq_ifPvjPjS3_P13Cost_estimate+0x48)[0x7f758ab61428] /usr/sbin/mysqld(+0x619cc8)[0x7f758ade4cc8] /usr/sbin/mysqld(_ZN10SQL_SELECT17test_quick_selectEP3THD6BitmapILj64EEyybN8st_order10enum_orderE+0xb38)[0x7f758adf1f18] /usr/sbin/mysqld(+0x66aa40)[0x7f758ae35a40] /usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x7d9)[0x7f758ae38219] /usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_P10SQL_I_ListI8st_orderESB_S7_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x1f6)[0x7f758ace1e16] /usr/sbin/mysqld(_Z13handle_selectP3THDP13select_resultm+0x165)[0x7f758ace2745] /usr/sbin/mysqld(+0x351e5a)[0x7f758ab1ce5a] /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x2086)[0x7f758acbde46] /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x618)[0x7f758acc2fb8] /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x236b)[0x7f758acc59ab] /usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x22d)[0x7f758ac8a50d] /usr/sbin/mysqld(handle_one_connection+0x40)[0x7f758ac8a590] /usr/sbin/mysqld(pfs_spawn_thread+0x140)[0x7f758b151c40] /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182)[0x7f75890ee182] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f758881130d] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (7f7540005210): is an invalid pointer Connection ID (thread ID): 46 Status: NOT_KILLED You may download the Percona Server operations manual by visiting http://www.percona.com/software/percona-server/. You may find information in the manual which will help you identify the cause of the crash. 140702 12:50:31 mysqld_safe Number of processes running now: 0 140702 12:50:31 mysqld_safe mysqld restarted