While the join_cache_level variable is set to a value > 2, a query with a join on a derived table with a TEXT column in it could result to a server crash when LIMIT x OFFSET x is used on the derived table.
To reproduce the crash, import the attached SQL then execute the following query :
EXPLAIN SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id;
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Here is the error log output :
mysqld: 130919 14:11:26 [ERROR] mysqld got signal 11 ;
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mysqld: This could be because you hit a bug. It is also possible that this binary
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mysqld: or one of the libraries it was linked against is corrupt, improperly built,
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mysqld: or misconfigured. This error can also be caused by malfunctioning hardware.
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mysqld:
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mysqld: To report this bug, see http://kb.askmonty.org/en/reporting-bugs
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mysqld:
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mysqld: We will try our best to scrape up some info that will hopefully help
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mysqld: diagnose the problem, but since we have already crashed,
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mysqld: something is definitely wrong and this may fail.
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mysqld:
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mysqld: Server version: 5.5.33-MariaDB-1~squeeze
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mysqld: key_buffer_size=2147483648
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mysqld: read_buffer_size=2097152
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mysqld: max_used_connections=1
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mysqld: max_threads=252
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mysqld: thread_count=1
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mysqld: It is possible that mysqld could use up to
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mysqld: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 3133826 K bytes of memory
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mysqld: Hope that's ok; if not, decrease some variables in the equation.
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mysqld:
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mysqld: Thread pointer: 0x0x7fb69bcfb5f0
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mysqld: Attempting backtrace. You can use the following information to find out
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mysqld: where mysqld died. If you see no messages after this, something went
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mysqld: terribly wrong...
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mysqld: stack_bottom = 0x7fb37714ae58 thread_stack 0x48000
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mysqld: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7fb69035d80e]
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mysqld: /usr/sbin/mysqld(handle_fatal_signal+0x4ac)[0x7fb68ff5cd7c]
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mysqld: /lib/libpthread.so.0(+0xeff0)[0x7fb68f659ff0]
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mysqld: /usr/sbin/mysqld(_ZN10DsMrr_impl15choose_mrr_implEjyPjS0_P9COST_VECT+0x54)[0x7fb68feff724]
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mysqld: /usr/sbin/mysqld(_ZN10DsMrr_impl10dsmrr_infoEjjjjPjS0_P9COST_VECT+0xe3)[0x7fb68feffad3]
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mysqld: /usr/sbin/mysqld(_Z33check_join_cache_usage_for_tablesP4JOINyj+0x694)[0x7fb68fe40ed4]
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mysqld: /usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x16c7)[0x7fb68fe4f477]
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mysqld: /usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0xd2)[0x7fb68fe568e2]
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mysqld: /usr/sbin/mysqld(_Z19mysql_explain_unionP3THDP18st_select_lex_unitP13select_result+0x10c)[0x7fb68fe5726c]
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mysqld: /usr/sbin/mysqld(+0x37771f)[0x7fb68fdfe71f]
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mysqld: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x35f9)[0x7fb68fe05539]
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mysqld: /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x1cc)[0x7fb68fe080ec]
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mysqld: /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1792)[0x7fb68fe09892]
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mysqld: /usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x419)[0x7fb68fece809]
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mysqld: /usr/sbin/mysqld(handle_one_connection+0x51)[0x7fb68fece8c1]
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mysqld: /lib/libpthread.so.0(+0x68ca)[0x7fb68f6518ca]
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mysqld: /lib/libc.so.6(clone+0x6d)[0x7fb68dfd0b6d]
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mysqld:
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mysqld: Trying to get some variables.
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mysqld: Some pointers may be invalid and cause the dump to abort.
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mysqld: Query (0x7fb69bd467f8): EXPLAIN SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id
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mysqld:
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mysqld: Connection ID (thread ID): 1
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mysqld: Status: NOT_KILLED
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mysqld:
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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
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mysqld:
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mysqld: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
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mysqld: information that should help you find out what is causing the crash.
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mysqld_safe: Number of processes running now: 0
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mysqld_safe: mysqld restarted
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Bug
Critical