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key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 440470 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 = 0 thread_stack 0x40000
/opt/mysql/bin/mysqld(my_print_stacktrace+0x3b)[0xf6c06b]
/opt/mysql/bin/mysqld(handle_fatal_signal+0x489)[0x86b9d9]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f56aefb8390]
/opt/mysql/bin/mysqld(_Z13destroy_mutexP9PFS_mutex+0x5d)[0x13deb6d]
/opt/mysql/bin/mysqld(_ZN6tokudb6thread7mutex_tD1Ev+0x1a)[0xfc338a]
/lib/x86_64-linux-gnu/libc.so.6(+0x39ff8)[0x7f56ae6f7ff8]
/lib/x86_64-linux-gnu/libc.so.6(+0x3a045)[0x7f56ae6f8045]
/opt/mysql/bin/mysqld[0x85ba15]
/opt/mysql/bin/mysqld(unireg_abort+0xa7)[0x860947]
/opt/mysql/bin/mysqld[0x86457f]
/opt/mysql/bin/mysqld(_Z11mysqld_mainiPPc+0x840)[0x864ee0]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f56ae6de830]
/opt/mysql/bin/mysqld(_start+0x29)[0x7a7c19]
You may download the Percona Server operations manual by visiting
http://www.percona.com/software/percona-server/. You may find information
in the manual which will help you identify the cause of the crash.
Writing a core file
Segmentation fault (core dumped)
2017-12-20T16:16:01.951934Z mysqld_safe mysqld from pid file /data/mysql/i-hyqmqpza.pid ended

** Affects: mysql-server
     Importance: Undecided
         Status: New


** Tags: core dumped
-- 
The bot crash, restart mysql
https://bugs.launchpad.net/bugs/1739523
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