mroonga error

gistfile1.txt

03:39:48 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.

key_buffer_size=33554432
read_buffer_size=1048576
max_used_connections=243
max_threads=1024
thread_count=30
connection_count=29
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2143952 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x33051e0
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 = 7f3a7c9f7e48 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x8d68f5]
/usr/sbin/mysqld(handle_fatal_signal+0x4a4)[0x663224]
/lib64/libpthread.so.0[0x38dc20f710]
/usr/lib64/libgroonga.so.0(grn_ii_cursor_next+0x9e7)[0x7f7d6f71a727]
/usr/lib64/libgroonga.so.0(+0x125fa2)[0x7f7d6f728fa2]
/usr/lib64/libgroonga.so.0(+0x126620)[0x7f7d6f729620]
/usr/lib64/libgroonga.so.0(grn_ii_select+0x36e)[0x7f7d6f72a94e]
/usr/lib64/libgroonga.so.0(grn_ii_sel+0xf4)[0x7f7d6f72b484]
/usr/lib64/libgroonga.so.0(grn_obj_search+0x4a0)[0x7f7d6f65a370]
/usr/lib64/libgroonga.so.0(grn_table_select+0x75d)[0x7f7d6f66fa3d]
/usr/lib64/mysql/plugin/ha_mroonga.so(_ZN10ha_mroonga26generic_ft_init_ext_selectEjjP6String+0x36b)[0x7f7d741aeffb]
/usr/lib64/mysql/plugin/ha_mroonga.so(_ZN10ha_mroonga19generic_ft_init_extEjjP6String+0xb7)[0x7f7d741af1a7]
/usr/lib64/mysql/plugin/ha_mroonga.so(_ZN10ha_mroonga19storage_ft_init_extEjjP6String+0x9)[0x7f7d741af3b9]
/usr/sbin/mysqld(_ZN15Item_func_match11init_searchEb+0x167)[0x605687]
/usr/sbin/mysqld(_Z12init_ftfuncsP3THDP13st_select_lexb+0x60)[0x690730]
/usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x1d5e)[0x84623e]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_P10SQL_I_ListI8st_orderESB_S7_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x207)[0x7017f7]
/usr/sbin/mysqld(_Z13handle_selectP3THDP13select_resultm+0x187)[0x7020c7]
/usr/sbin/mysqld[0x6dcbed]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x15bf)[0x6df43f]
/usr/sbin/mysqld(_ZN18Prepared_statement7executeEP6Stringb+0x426)[0x6f1786]
/usr/sbin/mysqld(_ZN18Prepared_statement12execute_loopEP6StringbPhS2_+0xb2)[0x6f4f52]
/usr/sbin/mysqld(_Z19mysqld_stmt_executeP3THDPcj+0x1d4)[0x6f5634]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1727)[0x6e4627]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0xcf)[0x6b112f]
/usr/sbin/mysqld(handle_one_connection+0x47)[0x6b1257]
/lib64/libpthread.so.0[0x38dc2079d1]
/lib64/libc.so.6(clone+0x6d)[0x38dbee8b6d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f38cc123f60): is an invalid pointer
Connection ID (thread ID): 73666226
Status: NOT_KILLED