Re: Linux kernel: powerpc: KVM guest can trigger host crash on Power8

On Fri, Oct 29, 2021 at 02:33:12PM +0200, John Paul Adrian Glaubitz wrote:

Hi Nicholas!

On 10/29/21 02:41, Nicholas Piggin wrote:

quoted

Soft lockup should mean it's taking timer interrupts still, just not 
scheduling. Do you have the hard lockup detector enabled as well? Is
there anything stuck spinning on another CPU?

quoted

Could you try a sysrq+w to get a trace of blocked tasks?

Not sure how to send a magic sysrequest over the IPMI serial console. Any idea?

As on any serial console sending break should be equivalent to the magic
sysrq key combo.

https://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/security-sysrq.html

With ipmitool break is sent by typing ~B

https://linux.die.net/man/1/ipmitool

Thanks

Michal