markus makela added a comment - 2020-02-03 12:35 - edited Managed to get a crash on 10.4.12 and 10.3.21: 200203 12:29:37 [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: 10.4.12-MariaDB-1:10.4.12+maria~bionic-log key_buffer_size=134217728 read_buffer_size=2097152 max_used_connections=8 max_threads=10002 thread_count=15 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 61830494 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f709c000c08 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 = 0x7f7110694dd8 thread_stack 0x49000 mysqld(my_print_stacktrace+0x2e)[0x55fe6f106c3e] mysqld(handle_fatal_signal+0x515)[0x55fe6eb7acf5] /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f712d94d890] mysqld(_Z19append_query_stringPK15charset_info_stP6StringPKcmb+0x61)[0x55fe6ec6f901] mysqld(_ZNK10Item_param19value_query_val_strEP3THDP6String+0xb6)[0x55fe6eb9bfc6] mysqld(_ZThn144_N10Item_param14append_for_logEP3THDP6String+0x7b)[0x55fe6eb9c4db] mysqld(+0x677377)[0x55fe6e97d377] mysqld(_ZN18Prepared_statement14set_parametersEP6StringPhS2_+0xe1)[0x55fe6e980de1] mysqld(_ZN18Prepared_statement12execute_loopEP6StringbPhS2_+0x35)[0x55fe6e982cc5] mysqld(+0x67da72)[0x55fe6e983a72] mysqld(_Z19mysqld_stmt_executeP3THDPcj+0x25)[0x55fe6e983b15] mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0xe35)[0x55fe6e96fda5] mysqld(_Z10do_commandP3THD+0x148)[0x55fe6e971be8] mysqld(_Z24do_handle_one_connectionP7CONNECT+0x25e)[0x55fe6ea4ddae] mysqld(handle_one_connection+0x3d)[0x55fe6ea4de6d] /lib/x86_64-linux-gnu/libpthread.so.0(+0x76db)[0x7f712d9426db] /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f)[0x7f712c36488f] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x0): Connection ID (thread ID): 17 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 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. 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 unlimited unlimited bytes Max resident set unlimited unlimited bytes Max processes 1048576 1048576 processes Max open files 1048576 1048576 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 127226 127226 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: |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e Here's the test program I used (maxscale listens on port 4006 with readwritesplit): #include <stdio.h> #include <iostream> #include <stdlib.h> #include <mysql.h> #include <string.h> #include <unistd.h>   using namespace std;   int main( int argc, char ** argv) { MYSQL *mysql; MYSQL_RES* result; MYSQL_ROW row; MYSQL_FIELD* fields;   if ((mysql = mysql_init(NULL)) == NULL) { cout << "Failed initialize client library." << endl; }   cout << "Connect" << endl;   if (!mysql_real_connect(mysql, "127.0.0.1" , "maxuser" , "maxpwd" , NULL, 4006, NULL, 0)) { cout << "Failed to connect to database: " << mysql_error(mysql) << endl; mysql_close(mysql); return 1; }   cout << "Create table" << endl;   mysql_query(mysql, "DROP TABLE IF EXISTS test.t1" ); mysql_query(mysql, "CREATE TABLE test.t1(id BIGINT)" ); mysql_query(mysql, "INSERT INTO test.t1 VALUES (1), (2), (3)" );   MYSQL_STMT *stmt = mysql_stmt_init(mysql); MYSQL_BIND param;   int value = 1; my_bool isnull = false ; const char * data = "SELECT * FROM test.t1 WHERE id = ?" ;   memset (&param, 0, sizeof (MYSQL_BIND)); param.buffer = &value; param.buffer_type = MYSQL_TYPE_LONG; param.is_null = &isnull; param.is_unsigned = false ;   cout << "Prepare" << endl;   if (mysql_stmt_prepare(stmt, data, strlen (data)) || mysql_stmt_bind_param(stmt, &param)) { cout << "Prepared statement preparation failure for '" << data << "': " << mysql_stmt_error(stmt) << endl; }   sleep(1); cout << "Execute" << endl; if (mysql_stmt_execute(stmt)) { cout << "Prepared statement execution failure for '" << data << "': " << mysql_stmt_error(stmt) << endl; }   value = 0; mysql_stmt_bind_result(stmt, &param); mysql_stmt_store_result(stmt); mysql_stmt_fetch(stmt);   cout << value << endl;   mysql_query(mysql, "BEGIN" );   // This is where it crashes if (mysql_stmt_execute(stmt)) { cout << "Prepared statement execution failure for '" << data << "': " << mysql_stmt_error(stmt) << endl; }   value = 0; mysql_stmt_bind_result(stmt, &param); mysql_stmt_store_result(stmt); mysql_stmt_fetch(stmt);   cout << value << endl;   mysql_query(mysql, "COMMIT" );   cout << "Close" << endl; mysql_stmt_close(stmt);   cout << "Disconnect" << endl;   mysql_close(mysql);   return 0; } I think the fact that the first time a COM_STMT_EXECUTE is executed inside the transaction the parameter types aren't sent.

Dmitry Shulga added a comment - 2021-09-27 11:57 I didn't manage to reproduce this bug report (during my experiments mariadb server was run with the --general-log option turned on). Looking at the source code of the function append_query_string() also didn't find any suspicious place that could be theoretically a reason for server crashing. So, to continue working on this task a test case that reproduces the bug report is required.

Alice Sherepa added a comment - 2021-11-02 11:48 This is likely the same bug as MDEV-19838 (fixed in 10.3.26, 10.4.16). Please check if the problem still exists in the recent versions.

Richard Stracke added a comment - 2024-10-22 05:35 >This is likely the same bug as MDEV-19838 (fixed in 10.3.26, 10.4.16). Please check if the problem still exists in the recent versions. Occurance happened 10.6.17-12 241021 15 : 04 : 33 [ERROR] mysqld got signal 11 ; Sorry, we probably made a mistake, and this is a bug.   Your assistance in bug reporting will enable us to fix this for the next release. 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: 10.6 . 17 - 12 -MariaDB-enterprise-log source revision: 249b7e2a0440ae1eb3ba14c607bdb61393bd464e key_buffer_size= 134217728 read_buffer_size= 2097152 max_used_connections= 750 max_threads= 5002 thread_count= 750 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 30995573 K bytes of memory Hope that's ok; if not, decrease some variables in the equation.   Thread pointer: 0x7f9304000c58 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 = 0x7f94c8ad2d18 thread_stack 0x49000 /usr/sbin/mariadbd(my_print_stacktrace+ 0x32 )[ 0x55757bd80052 ] /usr/sbin/mariadbd(handle_fatal_signal+ 0x475 )[ 0x55757b82b135 ] /lib/x86_64-linux-gnu/libpthread.so. 0 (+ 0x14420 )[ 0x7f9d075fb420 ] /usr/sbin/mariadbd(_Z19append_query_stringPK15charset_info_stP6StringPKcmb+ 0x65 )[ 0x55757b95c425 ] /usr/sbin/mariadbd(_ZNK10Item_param19value_query_val_strEP3THDP6String+ 0x114 )[ 0x55757b851bc4 ] /usr/sbin/mariadbd(_ZThn120_N10Item_param14append_for_logEP3THDP6String+ 0x7d )[ 0x55757b85215d ] /usr/sbin/mariadbd(+ 0x821312 )[ 0x55757b5e5312 ] /usr/sbin/mariadbd(_ZN18Prepared_statement14set_parametersEP6StringPhS2_+ 0x6f )[ 0x55757b5e95df ] /usr/sbin/mariadbd(_ZN18Prepared_statement12execute_loopEP6StringbPhS2_+ 0x3a )[ 0x55757b5ea84a ] /usr/sbin/mariadbd(+ 0x827b25 )[ 0x55757b5ebb25 ] /usr/sbin/mariadbd(_Z19mysqld_stmt_executeP3THDPcj+ 0x30 )[ 0x55757b5ebd10 ] /usr/sbin/mariadbd(_Z16dispatch_command19enum_server_commandP3THDPcjb+ 0x1e9f )[ 0x55757b5c466f ] /usr/sbin/mariadbd(_Z10do_commandP3THDb+ 0x138 )[ 0x55757b5c60b8 ] /usr/sbin/mariadbd(_Z24do_handle_one_connectionP7CONNECTb+ 0x3b7 )[ 0x55757b6efa07 ] /usr/sbin/mariadbd(handle_one_connection+ 0x5d )[ 0x55757b6efd5d ] /usr/sbin/mariadbd(+ 0xcb9bd6 )[ 0x55757ba7dbd6 ] /lib/x86_64-linux-gnu/libpthread.so. 0 (+ 0x8609 )[ 0x7f9d075ef609 ] /lib/x86_64-linux-gnu/libc.so. 6 (clone+ 0x43 )[ 0x7f9d071db353 ]   Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query ( 0x0 ): ( null ) Connection ID (thread ID): 2997 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,hash_join_cardinality=off,cset_narrowing=off,sargable_casefold=off   The manual page at https: //mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mariadbd/ contains information that should help you find out what is causing the crash.   We think the query pointer is invalid, but we will try to print it anyway. Query:   Writing a core file... Working directory at /data/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 255411 255411 processes Max open files 32768 32768 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 255411 255411 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: |/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E   Kernel version: Linux version 5.4 . 0 - 132 -generic (buildd @lcy02 -amd64- 059 ) (gcc version 9.4 . 0 (Ubuntu 9.4 . 0 -1ubuntu1~ 20.04 . 1 )) # 148 -Ubuntu SMP Mon Oct 17 16 : 02 : 06 UTC 2022