[debian-mysql] Bug#977178: Bug#977178: mariadb-plugin-rocksdb: Server crashes in rocksdb on startup on pmull on some ARM CPUs

[Michal Povinsky]

> Can you please help out and try to produce a repeatable test case to
> trigger this bug?

I managed to reproduce the issue in a KVM virtual machine running on a
Raspberry Pi 4.
The detail I was missing was having to restart the server twice after
creating a rocksdb table.
I believe it should be possible to reproduce the issue on an emulated
VM, but I couldn't find a way to configure CPU features in QEMU as
required.

-- Check that crc32 is supported, but pmull isn't.
root at armtest:~# grep Features /proc/cpuinfo
Features    : fp asimd evtstrm crc32 cpuid

root at armtest:~# apt-get install mariadb-plugin-rocksdb
root at armtest:~# mysql <<< "CREATE DATABASE a; USE a; CREATE TABLE a
(id INT PRIMARY KEY) ENGINE=ROCKSDB; INSERT INTO a VALUES (1);"
root at armtest:~# mysql <<< "SELECT * FROM a.a;"
-- This returns correct results

root at armtest:~# systemctl restart mysql
root at armtest:~# mysql <<< "SELECT * FROM a.a;"
-- Restart mysql once, everything still works

root at armtest:~# systemctl restart mysql
Job for mariadb.service failed because a fatal signal was delivered to
the control process.
See "systemctl status mariadb.service" and "journalctl -xe" for details.
-- But the second restart fails!