Comment # 8 on bug 1105302 from Guillaume GARDET

(In reply to Guillaume GARDET from comment #6)
> As a workaround, I added 'EXTRABOOTPARAMS=
> rcupdate.rcu_task_stall_timeout=0' to aarch64 machine settings to disable
> RCU task stall messages, using grub.

It is not working since there is a reboot after the installation. It seems
GRUB_KERNEL_OPTION_APPEND would be a better candidate as it is used in
'grub_test', after the reboot of the installation.
GRUB_KERNEL_OPTION_APPEND should probably also be added to 'boot_to_desktop'
test.