ERROR 2013 (HY000): Lost connection to MySQL server during query

SELECT forums_posts.*, forums_topics.* FROM `forum_forums_posts` AS `forums_posts`  STRAIGHT_JOIN `forum_forums_topics` AS `forums_topics` ON forums_posts.topic_id=forums_topics.tid AND ( forums_topics.approved=1 OR ( forums_topics.approved=0 AND forums_topics.starter_id=6158 ) ) 

AND forums_topics.approved!=-2 AND forums_topics.approved !=-3  LEFT JOIN `forum_forums_forums` AS `forums_forums` ON forums_topics.forum_id=forums_forums.id AND forums_forums.password IS NULL AND forums_forums.can_view_others=1 AND ( forums_forums.password IS NULL OR ( FIND_IN_SET(6,forums_forums.password_override) ) ) AND forums_forums.min_posts_view<='?' WHERE ( forums_forums.can_view_others='1' OR forums_topics.starter_id='?' )

 AND queued='?' AND forums_posts.queued!='-2' AND forums_posts.queued !='-3' AND 

 forums_topics.forum_id IN(1,14,15,17,21,5281,5279,5280,27,32,36,38,39,40,41,42,43,46,47,48,49,50,361,57,60,6126,6128,6130,67,6148,6151,82,90,92,5943,5944,97,99,101,151,176,2150,149,35,1667,150,4447,178,6164,128,129,134,135,162,4561,4562,6199,6132,6133,6359,4375,5983,1060,364,372,6240,6241,6145,362,365,366,367,369,370,373,6249,374,6352,375,6253,6254,376,5980,378,6251,6252,379,381,5982,6165,6166,6167,6176,6170,6171,6172,6173,6174,5893,6134,6135,6136,6137,6150,5284,497,5183,6142,6144,551,569,2325,605,6161,6162,654,9,4711,4432,1857,6179,6326,6196,6197,4713,1217,6178,2249,4712,1116,1117,1118,1119,1120,1121,1105,100,80,1239,1240,1241,1123,1124,1127,5277,5278,5108,5087,4082,1218,5964,1243,1244,1245,1247,1858,6255,2250,1248,1249,2172,1920,6152,1861,1317,4708,6263,1346,4710,4480,5987,4481,4515,6261,4709,1447,1448,1449,1917,2029,1475,1929,4704,4705,4706,1556,1928,1591,1585,1586,1855,5106,6131,5153,1859,5156,5157,5158,4748,4749,4750,4083,2032,2033,6347,2039,6284,5285,6243,5988,4479,2324,6101,2173,4486,5090,5089,2027,2201,2202,2203,2204,2205,2206,2207,1338,2236,2235,6245,2234,6244,5249,2238,2239,6246,5058,2251,2252,2253,6207,2255,2256,2257,2258,2260,5149,5102,5749,5100,5060,6163,2440,2441,5103,5104,5062,5000,2450,2537,2561,2829,5061,3029,3030,3031,3032,6262,3081,3157,6280,4999,3471,3472,3474,3475,3476,4377,4379,5984,6344,4909,4939,4938,4898,4899,4900,4901,4934,4935,4564,6259,2437,4880,4879,6201,5148,5146,3959,3960,3961,3962,6177,6157,6158,6160,6200,4220,4221,4222,4224,4560,4936,4892,4893,5118,5111,4394,4477,5985,4622,10,6206,12,554,6205,4992,4993,4251,4995,5059,4985,6124,4476,4922,4277,4278,4281,4620,4306,4618,4619,4309,4308,4307,4303,4304,4305,5184,4478,5986,132,1348,5247,5882,5145,5142,4279,4330,4331,4332,4333,4334,4335,5196,5057,5578,5577,4403,4402,4401,4400,4399,4398,4397,4396,4374,6123,4395,4373,1122,78,5120,5121,5091,5947,4764,5465,4675,4676,5283,5185,5187,5188,4707,5945,102,5113,5286,4996,6351,5182,5899,5147,4823,23,6266,5466,4910,5181,5143,5179,5154,6153,5250,5150,4862,6360,4882,4883,4884,4885,4886,4887,4888,4940,4941,4942,4943,4944,1343,5088,1345,5180,4891,4994,5946,6260,5105,5063,4812,5287,5302,5303,5304,5305,5306,5307,5308,6250,6230,6231,6232,6233,6234,6235,6236,5503,5502,6265,5979,6242,5390,5391,5392,5595,5594,5592,5591,5596,5597,5598,5599,6257,5883,5659,5660,5661,5662,5663,6256,5891,5695,5696,6346,6345,6339,6340,6341,6342,5720,5721,5722,5723,5724,5725,6279,6277,5812,5813,5814,5816,6343,6285,6286,6283,6258,6281,6282,6353,6354,6218,6229,6389,6357,6356,6355,6337,6084,6085,6086,6087,6088,6089,6090,6041,6042,6040,6037,6038,6209,6210,6212,6213,6214,6215,6216,6054,6055,6056,6057,6058,6059,6060,6061,6062,6064,6065,6066,6067,6068,6070,6071,6072,6073,6074,6093,6092,6082,6081,6080,6094,6095,6096,6097,6098,6102,6103,6104,6119,6120,6121,6325,6111,6112,6113,6114,6115,6116,6117,6298,6372,6300,6301,6302,6303,6304,6373,6387,6388,6349,6348,6330,6328,6329,6327,6365,6366,6367,6386,6385,6374,6375,6376,6377,6378,6390,6380,6381,6382,6383,6391,6392,6393,6394,6395,6397,6398,6399,6400,6401,6402,6403,6404,6405,6406,6407,6408) ORDER BY post_date DESC LIMIT 10

2021-03-24  0:25:32 0 [Note] InnoDB: Uses event mutexes

2021-03-24  0:25:32 0 [Note] InnoDB: Compressed tables use zlib 1.2.11

2021-03-24  0:25:32 0 [Note] InnoDB: Number of pools: 1

2021-03-24  0:25:32 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions

2021-03-24  0:25:32 0 [Note] mariadbd: O_TMPFILE is not supported on /tmp (disabling future attempts)

2021-03-24  0:25:32 0 [Note] InnoDB: Using Linux native AIO

2021-03-24  0:25:32 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728

2021-03-24  0:25:32 0 [Note] InnoDB: Completed initialization of buffer pool

2021-03-24  0:25:32 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().

2021-03-24  0:25:32 0 [Note] InnoDB: 128 rollback segments are active.

2021-03-24  0:25:32 0 [Note] InnoDB: Creating shared tablespace for temporary tables

2021-03-24  0:25:32 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...

2021-03-24  0:25:32 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.

2021-03-24  0:25:32 0 [Note] InnoDB: 10.5.9 started; log sequence number 75840139118; transaction id 14134545

2021-03-24  0:25:32 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool

2021-03-24  0:25:32 0 [Note] Plugin 'FEEDBACK' is disabled.

2021-03-24  0:25:32 0 [Note] Server socket created on IP: '0.0.0.0'.

2021-03-24  0:25:32 0 [Note] Reading of all Master_info entries succeeded

2021-03-24  0:25:32 0 [Note] Added new Master_info '' to hash table

2021-03-24  0:25:32 0 [Note] /usr/sbin/mariadbd: ready for connections.

Version: '10.5.9-MariaDB-1:10.5.9+maria~focal'  socket: '/run/mysqld/mysqld.sock'  port: 3306  mariadb.org binary distribution

2021-03-24  0:25:32 0 [Note] InnoDB: Buffer pool(s) load completed at 210324  0:25:32

210324  0:32:12 [ERROR] 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.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

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.

Server version: 10.5.9-MariaDB-1:10.5.9+maria~focal

key_buffer_size=134217728

read_buffer_size=131072

max_used_connections=5

max_threads=153

thread_count=5

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467864 K  bytes of memory

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

Thread pointer: 0x7fa0e0000c58

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 = 0x7fa128667d58 thread_stack 0x49000

??:0(my_print_stacktrace)[0x562c029caaf2]

??:0(handle_fatal_signal)[0x562c024206f5]

??:0(__restore_rt)[0x7fa12c3733c0]

??:0(Type_handler_newdecimal::calc_pack_length(unsigned int) const)[0x562c020b3cae]

??:0(SEL_ARG::tree_delete(SEL_ARG*))[0x562c02567333]

??:0(SEL_ARG::tree_delete(SEL_ARG*))[0x562c02567c7f]

??:0(SEL_IMERGE::and_sel_tree(RANGE_OPT_PARAM*, SEL_TREE*, SEL_IMERGE*))[0x562c02568141]

??:0(SEL_IMERGE::and_sel_tree(RANGE_OPT_PARAM*, SEL_TREE*, SEL_IMERGE*))[0x562c025682a4]

??:0(SEL_IMERGE::and_sel_tree(RANGE_OPT_PARAM*, SEL_TREE*, SEL_IMERGE*))[0x562c0256849d]

??:0(Item_cond_and::get_mm_tree(RANGE_OPT_PARAM*, Item**))[0x562c025688e2]

??:0(SQL_SELECT::test_quick_select(THD*, Bitmap<64u>, unsigned long long, unsigned long long, bool, bool, bool, bool))[0x562c0256f266]

??:0(JOIN::optimize_inner())[0x562c0227a043]

??:0(JOIN::optimize())[0x562c0227ab73]

??:0(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x562c0227ac37]

??:0(handle_select(THD*, LEX*, select_result*, unsigned long))[0x562c0227b657]

??:0(LEX::mark_first_table_as_inserting())[0x562c02209f11]

??:0(mysql_execute_command(THD*))[0x562c022181a7]

??:0(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x562c02204a9f]

??:0(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x562c0221065f]

??:0(do_command(THD*))[0x562c02212a37]

??:0(do_handle_one_connection(CONNECT*, bool))[0x562c02318341]

??:0(handle_one_connection)[0x562c023187bd]

??:0(MyCTX_nopad::finish(unsigned char*, unsigned int*))[0x562c02676c66]

??:0(start_thread)[0x7fa12c367609]

??:0(clone)[0x7fa12bf56293]

Trying to get some variables.

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

Query (0x7fa0e0010670): SELECT forums_posts.*, forums_topics.* FROM `forum_forums_posts` AS `forums_posts`  STRAIGHT_JOIN `forum_forums_topics` AS `forums_topics` ON forums_posts.topic_id=forums_topics.tid AND ( forums_topics.approved=1 OR ( forums_topics.approved=0 AND forums_topics.starter_id=6158 ) ) 

AND forums_topics.approved!=-2 AND forums_topics.approved !=-3  LEFT JOIN `forum_forums_forums` AS `forums_forums` ON forums_topics.forum_id=forums_forums.id AND forums_forums.password IS NULL AND forums_forums.can_view_others=1 AND ( forums_forums.password IS NULL OR ( FIND_IN_SET(6,forums_forums.password_override) ) ) AND forums_forums.min_posts_view<='?' WHERE ( forums_forums.can_view_others='1' OR forums_topics.starter_id='?' )

 AND queued='?' AND forums_posts.queued!='-2' AND forums_posts.queued !='-3' AND 

 forums_topics.forum_id IN(1,14,15,17,21,5281,5279,5280,27,32,36,38,39,40,41,42,43,46,47,48,49,50,361,57,60,6126,6128,6130,67,6148,6151,82,90,92,5943,5944,97,99,101,151,176,2150,149,35,1667,150,4447,178,6164,128,129,134,135,162,4561,4562,6199,6132,6133,6359,4375,5983,1060,364,372,6240,6241,6145,362,365,366,367,369,370,373,6249,374,6352,375,6253,6254,376,5980,378,6251,6252,379,381,5982,6165,6166,6167,6176,6170,6171,6172,6173,6174,5893,6134,6135,6136,6137,6150,5284,497,5183,6142,6144,551,569,2325,605,6161,6162,654,9,4711,4432,1857,6179,6326,6196,6197,4713,1217,6178,2249,4712,1116,1117,1118,1119,1120,1121,1105,100,80,1239,1240,1241,1123,1124,1127,5277,5278,5108,5087,4082,1218,5964,1243,1244,1245,1247,1858,6255,2250,1248,1249,2172,1920,6152,1861,1317,4708,6263,1346,4710,4480,5987,4481,4515,6261,4709,1447,1448,1449,1917,2029,1475,1929,4704,4705,4706,1556,1928,1591,1585,1586,1855,5106,6131,5153,1859,5156,5157,5158,4748,4749,4750,4083,2032,2033,6347,2039,6284,5285,6243,5988,4479,2324,6101,2173,4486,5090,5089,2027,2201,2202,2203,2204,2205,2206,2207,1338,2236,2235,6245,2234,6244,5249,2238,2239,6246,5058,2251,2252,2253,6207,2255,2256,2257,2258,2260,5149,5102,5749,5100,5060,6163,2440,2441,5103,5104,5062,5000,2450,2537,2561,2829,5061,3029,3030,3031,3032,6262,3081,3157,6280,4999,3471,3472,3474,3475,3476,4377,4379,5984,6344,4909,4939,4938,4898,4899,4900,4901,4934,4935,4564,6259,2437,4880,4879,6201,5148,5146,3959,3960,3961,3962,6177,6157,6158,6160,6200,4220,4221,4222,4224,4560,4936,4892,4893,5118,5111,4394,4477,5985,4622,10,6206,12,554,6205,4992,4993,4251,4995,5059,4985,6124,4476,4922,4277,4278,4281,4620,4306,4618,4619,4309,4308,4307,4303,4304,4305,5184,4478,5986,132,1348,5247,5882,5145,5142,4279,4330,4331,4332,4333,4334,4335,5196,5057,5578,5577,4403,4402,4401,4400,4399,4398,4397,4396,4374,6123,4395,4373,1122,78,5120,5121,5091,5947,4764,5465,4675,4676,5283,5185,5187,5188,4707,5945,102,5113,5286,4996,6351,5182,5899,5147,4823,23,6266,5466,4910,5181,5143,5179,5154,6153,5250,5150,4862,6360,4882,4883,4884,4885,4886,4887,4888,4940,4941,4942,4943,4944,1343,5088,1345,5180,4891,4994,5946,6260,5105,5063,4812,5287,5302,5303,5304,5305,5306,5307,5308,6250,6230,6231,6232,6233,6234,6235,6236,5503,5502,6265,5979,6242,5390,5391,5392,5595,5594,5592,5591,5596,5597,5598,5599,6257,5883,5659,5660,5661,5662,5663,6256,5891,5695,5696,6346,6345,6339,6340,6341,6342,5720,5721,5722,5723,5724,5725,6279,6277,5812,5813,5814,5816,6343,6285,6286,6283,6258,6281,6282,6353,6354,6218,6229,6389,6357,6356,6355,6337,6084,6085,6086,6087,6088,6089,6090,6041,6042,6040,6037,6038,6209,6210,6212,6213,6214,6215,6216,6054,6055,6056,6057,6058,6059,6060,6061,6062,6064,6065,6066,6067,6068,6070,6071,6072,6073,6074,6093,6092,6082,6081,6080,6094,6095,6096,6097,6098,6102,6103,6104,6119,6120,6121,6325,6111,6112,6113,6114,6115,6116,6117,6298,6372,6300,6301,6302,6303,6304,6373,6387,6388,6349,6348,6330,6328,6329,6327,6365,6366,6367,6386,6385,6374,6375,6376,6377,6378,6390,6380,6381,6382,6383,6391,6392,6393,6394,6395,6397,6398,6399,6400,6401,6402,6403,6404,6405,6406,6407,6408) ORDER BY post_date DESC LIMIT 10

Connection ID (thread ID): 1665

Status: NOT_KILLED

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=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off

The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains

information that should help you find out what is causing the crash.

Writing a core file...

Working directory at /var/lib/mysql

Resource Limits:

Limit                     Soft Limit           Hard Limit           Units     

Max cpu time              unlimited            unlimited            seconds   

Max file size             unlimited            unlimited            bytes     

Max data size             unlimited            unlimited            bytes     

Max stack size            8388608              unlimited            bytes     

Max core file size        0                    unlimited            bytes     

Max resident set          unlimited            unlimited            bytes     

Max processes             256160               256160               processes 

Max open files            16384                16384                files     

Max locked memory         65536                65536                bytes     

Max address space         unlimited            unlimited            bytes     

Max file locks            unlimited            unlimited            locks     

Max pending signals       256160               256160               signals   

Max msgqueue size         819200               819200               bytes     

Max nice priority         0                    0                    

Max realtime priority     0                    0                    

Max realtime timeout      unlimited            unlimited            us        

Core pattern: core