Memory coherency issue with IO thread offloading?

[Daniel Black]

Thanks Jens, Nick, Christophe and Michael for your work so far.

Apologies for the out of thread email.

Confirming MariabD-10.6+ is required( when we added liburing), and
previous versions used libaio (which tested without incident as mpe
retested).

We were (we're now back on the old good kernel Jens indicated) getting
failures like https://buildbot.mariadb.org/#/builders/231/builds/16857
in a container (of various distro userspaces) on bare metal.

bare metal end of /proc/cpuinfo

processor    : 127
cpu        : POWER9, altivec supported
clock        : 3283.000000MHz
revision    : 2.2 (pvr 004e 1202)

timebase    : 512000000
platform    : PowerNV
model        : 9006-22P
machine        : PowerNV 9006-22P
firmware    : OPAL
MMU        : Radix