Found using:
- innodb_read_io_threads=24
- innodb_write_io_threads=24
- innodb_buffer_pool_instances=32
- innodb_encrypt_tables=1
Problem is that there can be more than pre-allocated number of used slots on encryption/compression because of open I/O requests.
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Bug
Major
commit 4a6a61cb8190ad5b8fc3993b15e0fa48bcb730a5
Author: Jan Lindström <jan.lindstrom@mariadb.com>
Date: Mon Jun 8 08:09:33 2015 +0300
MDEV-8268: InnoDB: Assertion failure in file buf0buf.cc line 5842 failing assertion ut_a(free_slot != NULL);Analysis: Problem is that there is not enough temporary buffer slots
for pending IO requests.
Fixed by allocating same amount of temporary buffer slots as there
are max pending IO requests.