Comment # 1 on bug 1222395 from Jan Engelhardt

The machine in question is a VisionFive 2 (JH7110).
/proc/cpuinfo identifies the CPU as

isa: rv64imafdc_zicntr_zicsr_zifencei_zihpm_zba_zbb

But there are indications it does not actually support Zicntr in hardware, and
instead, let firmware (OpenSBI) emulate it.
https://libera.irclog.whitequark.org/riscv/2023-03-31

Whether my opensbi is recent enough (2023-11-29) is currently unclear.

Or, it's something much more trivial: The instruction is now privileged,
https://github.com/MariaDB/server/commit/656f8867720efc1b4dd0969319f35a3e1a2a005e
. I'll try that mariadb patch once I get the chance.