Hello,
I have a nothing fancy SQL statement that crashes MariaDB 10.3.31. The
error log reports "mysqld got signal 11" with the below included mini
core dump.
The statement caused no issues with my prior install of 10.2.xx. With
10.3, the statement runs the majority of the time. The vast majority of
the time.
I have never dealt with such an issue with MariaDB, and am unsure where
to start with troubleshooting this. Any tips?
FYI, there is a corresponding bug recorded here:
https://jira.mariadb.org/browse/MDEV-26835
Thanks,
Mike
211014 16:13:53 [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: 10.3.31-MariaDB-1:10.3.31+maria~focal-log
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=587
max_threads=752
thread_count=81
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads =
1784362 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x7f13e83b3768
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 = 0x7f1644e96dd8 thread_stack 0x49000
/usr/sbin/mysqld(my_print_stacktrace+0x32)[0x55d5a2f6f3a2]
/usr/sbin/mysqld(handle_fatal_signal+0x55d)[0x55d5a2a46e8d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x153c0)[0x7f27569fc3c0]
/usr/sbin/mysqld(+0x978f4f)[0x55d5a2bdbf4f]
/usr/sbin/mysqld(_ZN7handler10ha_rnd_posEPhS0_+0x50)[0x55d5a2a4c6d0]
/usr/sbin/mysqld(_Z16rr_from_pointersP11READ_RECORD+0x3e)[0x55d5a2b7cb2e]
/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x18e)[0x55d5a28869be]
/usr/sbin/mysqld(_ZN4JOIN10exec_innerEv+0xbee)[0x55d5a28b0dce]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x37)[0x55d5a28b1137]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0xf2)[0x55d5a28b1282]
/usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x14b)[0x55d5a28b1bcb]
/usr/sbin/mysqld(+0x5de9f1)[0x55d5a28419f1]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x5414)[0x55d5a284f6e4]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x1f3)[0x55d5a2852253]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x105d)[0x55d5a285462d]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x12d)[0x55d5a28565dd]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x246)[0x55d5a293f186]
/usr/sbin/mysqld(handle_one_connection+0x3f)[0x55d5a293f35f]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x9609)[0x7f27569f0609]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43)[0x7f2756915293]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f13e84a8b70): SELECT * FROM ((
#
# get postings from last statement and postings not on
statements
#
SELECT a.*, COALESCE(ci.id, i.id) as invoice_id
FROM ddx_lab_801317.postings a
LEFT JOIN ddx_lab_801317.cases_invoices ci
ON a.ref_type = 'CASE_INVOICE' AND a.ref_id = ci.id
LEFT JOIN ddx_lab_801317.invoices i
ON a.ref_type = 'INVOICE' AND a.ref_id = i.id
WHERE (
a.statement_date IS NULL
OR a.statement_date = '2021-09-27'
)
AND a.practice_id='19686'
ORDER BY post_date
) UNION (
#
# get postings that have remaining balances
#
SELECT DISTINCT a.*, COALESCE(ci.id, i.id) as invoice_id
FROM ddx_lab_801317.postings a
LEFT JOIN ddx_lab_801317.cases_invoices ci
ON a.ref_type = 'CASE_INVOICE' AND a.ref_id = ci.id
LEFT JOIN ddx_lab_801317.invoices i
ON a.ref_type = 'INVOICE' AND a.ref_id = i.id
LEFT JOIN ddx_lab_801317.postings b
ON a.ref_type = b.ref_type
AND a.ref_id = b.ref_id
AND a.id != b.id
WHERE NOT (a.type = 'CREDIT' OR a.type = 'PAYMENT')
AND ((SELECT SUM(b.amount)) IS NULL OR (SELECT
SUM(a.amount)) + (SELECT SUM(b.amount)) > 0)
AND a.practice_id='19686'
GROUP BY a.id
ORDER BY post_date
) UNION (
#
# get partial payments and credits from older statements
#
SELECT a.*, COALESCE(ci.id, i.id) as invoice_id
FROM ddx_lab_801317.postings a
LEFT JOIN ddx_lab_801317.cases_invoices ci
ON a.ref_type = 'CASE_INVOICE' AND a.ref_id = ci.id
LEFT JOIN ddx_lab_801317.invoices i
ON a.ref_type = 'INVOICE' AND a.ref_id = i.id
WHERE (
a.statement_date < '2021-09-27'
)
AND (a.type='PAYMENT' OR a.type='CREDIT')
AND a.practice_id='19686' )) AS t1 ORDER BY post_date ASC,
invoice_id ASC
Connection ID (thread ID): 21014956
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=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on
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 unlimited unlimited processes
Max open files 1048576 1048576 files
Max locked memory unlimited unlimited bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 514974 514974 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
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