Hello Michael,
Michael Bringmann <m...@linux.vnet.ibm.com> writes: > I have asked Scott Mayes to take a look at one of these crashes from > the phyp side. I will let you know if he finds anything notable. Thanks! It might make sense to test whether booting with cede_offline=off makes the bug go away. One suspicion I have is regarding the code handling CPU_STATE_INACTIVE. >From what I understand, it is a powerpc-specific CPU state and from the perspective of the generic CPU hotplug state machine, inactive CPUs are already fully offline. Which means that the locking performed by the generic code state machine doesn't apply to transitioning CPUs from INACTIVE to OFFLINE state. Perhaps the bug is that there is more than one CPU making that transition at the same time? That would cause two CPUs to call RTAS stop-self. I haven't checked whether this is really possible or not, though. It's just a conjecture. -- Thiago Jung Bauermann IBM Linux Technology Center
