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Subject: Re: Injecting SLB miltihit crashes kernel 5.9.0-rc5
To: =?UTF-8?Q?Michal_Such=c3=a1nek?= <msuchanek@suse.de>,
 linuxppc-dev@lists.ozlabs.org
References: <20200915084302.GG29778@kitsune.suse.cz>
From: Mahesh Jagannath Salgaonkar <mahesh@linux.ibm.com>
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Date: Wed, 16 Sep 2020 12:42:54 +0530
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On 9/15/20 2:13 PM, Michal Suchánek wrote:
> Hello,
> 
> Using the SLB mutihit injection test module (which I did not write so I
> do not want to post it here) to verify updates on my 5.3 frankernekernel
> I found that the kernel crashes with Oops: kernel bad access.
> 
> I tested on latest upstream kernel build that I have at hand and the
> result is te same (minus the message - nothing was logged and the kernel
> simply rebooted).


Yes, SLB multihit recovery is broken upstream. Fix is on the way.


> 
> Since the whole effort to write a real mode MCE handler was supposed to
> prevent this maybe the SLB injection module should be added to the
> kernel selftests?

Yes. We are working on adding SLB injection selftest patches will be
posted soon.

Thanks,
-Mahesh.

> 
> Thanks
> 
> Michal
>