mysqld: Server version: 5.5.29-MariaDB-mariadb1~precise-log

mysqld: key_buffer_size=134217728

mysqld: read_buffer_size=2097152

mysqld: max_used_connections=1

mysqld: max_threads=102

mysqld: thread_count=1

mysqld: It is possible that mysqld could use up to 

mysqld: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 759225 K  bytes of memory

mysqld: Hope that's ok; if not, decrease some variables in the equation.

mysqld: 

mysqld: Thread pointer: 0x0x7ff296d2bfd0

mysqld: Attempting backtrace. You can use the following information to find out

mysqld: where mysqld died. If you see no messages after this, something went

mysqld: terribly wrong...

mysqld: stack_bottom = 0x7ff2920bee40 thread_stack 0x48000

mysqld: ??:0(??)[0x7ff292a542fb]

mysqld: ??:0(??)[0x7ff292679aa1]

mysqld: ??:0(??)[0x7ff290eedcb0]

mysqld: ??:0(??)[0x7ff292794ccc]

mysqld: ??:0(??)[0x7ff2925716ed]

mysqld: ??:0(??)[0x7ff29257617b]

mysqld: ??:0(??)[0x7ff29252fa9b]

mysqld: ??:0(??)[0x7ff29252fcf7]

mysqld: ??:0(??)[0x7ff29252ffdf]

mysqld: ??:0(??)[0x7ff29253204f]

mysqld: ??:0(??)[0x7ff2925326c3]

mysqld: ??:0(??)[0x7ff2925eee63]

mysqld: ??:0(??)[0x7ff2925eef61]

mysqld: ??:0(??)[0x7ff290ee5e9a]

mysqld: ??:0(??)[0x7ff290616ccd]

mysqld: 

mysqld: Trying to get some variables.

mysqld: Some pointers may be invalid and cause the dump to abort.

mysqld: Query (0x7ff2500699e8): is an invalid pointer

mysqld: Connection ID (thread ID): 34

mysqld: Status: NOT_KILLED

mysqld: Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off