120718 20:32:57 [Note] Plugin 'FEDERATED' is disabled.
120718 20:32:57 InnoDB: The InnoDB memory heap is disabled
120718 20:32:57 InnoDB: Mutexes and rw_locks use GCC atomic builtins
120718 20:32:57 InnoDB: Compressed tables use zlib 1.2.3
120718 20:32:57 InnoDB: Using Linux native AIO
120718 20:32:57 InnoDB: Initializing buffer pool, size = 256.0M
120718 20:32:57 InnoDB: Completed initialization of buffer pool
120718 20:32:57 InnoDB: highest supported file format is Barracuda.
120718 20:32:59  InnoDB: Waiting for the background threads to start
120718 20:33:00 InnoDB: 1.1.8 started; log sequence number 24395374931
120718 20:33:00 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
120718 20:33:00 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
120718 20:33:00 [Note] Server socket created on IP: '0.0.0.0'.
120718 20:33:00 [Warning] 'user' entry 'root@aakash' ignored in --skip-name-resolve mode.
120718 20:33:00 [Note] Event Scheduler: Loaded 2 events
120718 20:33:00 [Note] /centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld: ready for connections.
Version: '5.5.25a-log'  socket: '/tmp/mysql.sock'  port: 3306  MySQL Community Server (GPL)
120718 20:33:00 [Note] Event Scheduler: scheduler thread started with id 1
15:05:46 UTC - mysqld got signal 8 ;
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.

key_buffer_size=33554432
read_buffer_size=2097152
max_used_connections=1
max_threads=500
thread_count=2
connection_count=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 5158478 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x3aacce0
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 = 2b3ebc03fe98 thread_stack 0x40000
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(my_print_stacktrace+0x35)[0x79d285]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(handle_fatal_signal+0x403)[0x66d3b3]
/lib64/libpthread.so.0[0x3771c0f500]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_ZN12ha_partition21min_rows_for_estimateEv+0x61)[0x9279e1]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld[0x72c9ef]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld[0x72d0fe]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld[0x72d37c]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_ZN10SQL_SELECT17test_quick_selectEP3THD6BitmapILj64EEyyb+0x1189)[0x737009]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld[0x5a9e96]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_ZN4JOIN8optimizeEv+0x581)[0x5ab261]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x171)[0x5aeea1]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x179)[0x5b4c59]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z21mysql_execute_commandP3THD+0x3db2)[0x579e52]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x18a)[0x57a8ea]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1321)[0x57c491]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(_Z24do_handle_one_connectionP3THD+0x167)[0x612d97]
/centina/sa/mysql-5.5.25a-linux2.6-x86_64/bin/mysqld(handle_one_connection+0x54)[0x612e04]
/lib64/libpthread.so.0[0x3771c07d90]
/lib64/libc.so.6(clone+0x6d)[0x37718f0f5d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (2b3ec00469e0): INSERT INTO tab_raw (id1, id2, valueType, value, `minValue`, `maxValue`, timeStamp, timePeriod, validity, opsType)  SELECT *  FROM tab_raw WHERE timeStamp >= '2012-07-17 00:00:01'
Connection ID (thread ID): 7
Status: NOT_KILLED

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.