[MDEV-23873]  [ERROR] mysqld got signal 11 ; Created: 2020-10-02  Updated: 2020-10-02

Status: Open
Project: MariaDB Server
Component/s: Debug
Affects Version/s: 10.3.24
Fix Version/s: None

Type: Bug Priority: Major
Reporter: Daniel Stan Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: crash
Environment:

CloudLinux 7.8, Intel(R) Xeon(R) CPU E5-2697 v4 @ 2.30GHz, 128GB RAM, SSD storage.


 Description   

Hello,

It is the third time when on this server when we keep getting random high load average and mysql crash without any luck on finding whats causing the issue.

The log show only:

201002 10:07:59 [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: 10.3.24-MariaDB-cll-lve
key_buffer_size=4294967296
read_buffer_size=135168
max_used_connections=66
max_threads=1002
thread_count=72
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 12557599 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
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 = 0x0 thread_stack 0x49000

 Comments   
Comment by Daniel Black [ 2020-10-02 ]

is a core dump generated?

Can you get a stack trace with: https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/#analyzing-a-core-file-with-gdb-on-linux ?

Comment by Daniel Stan [ 2020-10-02 ]

Hello,

We do not have a core file generated to be able to trace it with gdb though we have core_file inside the configuration.

What do you suggest?

Comment by Daniel Black [ 2020-10-02 ]

Any of these make sense in your environment https://mariadb.com/kb/en/enabling-core-dumps/?

check /proc/$(pidof mysqld)/limits for the core limit of a running process.

sysctl -a | grep core_

for kernel core dump settings.

Comment by Daniel Stan [ 2020-10-02 ]

MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE 'core_file';
--------------------+

Variable_name Value

--------------------+

core_file ON

--------------------+
1 row in set (0.001 sec)

  1. cat /proc/11915/limits | grep core
    Max core file size unlimited unlimited bytes

I do not see anything wrong except I cannot digg in more about it.

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