Subject: Re: kvm: repeatable kernel crash with Athlon II cpu
To: Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org
References: <56FA9DB1.4060704@list.ru> <56FAA135.1080600@redhat.com>
 <56FAA88C.3050800@list.ru> <56FAACDC.1010802@redhat.com>
Cc: Stas Sergeev <stsp@users.sourceforge.net>,
        Linux kernel <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>
From: Stas Sergeev <stsp@list.ru>
Message-ID: <56FAB6FC.2000204@list.ru>
Date: Tue, 29 Mar 2016 20:10:20 +0300
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29.03.2016 19:27, Paolo Bonzini пишет:
> On 29/03/2016 18:08, Stas Sergeev wrote:
>>>> I've been running dosemu and found out that it hangs
>>>> or reboots one of my PCs. This happens with any fedora-23
>>>> kernels and hand-compiled kernels. The latest I tried, were:
>>>> 4.4.6-300.fc23.x86_64
>>>> 4.5.0-rc6
>>>
>>> Can you check if 4.3 works?
>>
>> Same crash on kernel-4.2.3-300.fc23.x86_64 - the oldest
>> available for f23.
>>
>>>>>> Hope someone can find such an old CPU an reproduce the problem.
>>>>>> Please let me know what info should I provide or what debugging
>>>>>> to do to help getting that fixed.
>>>>
>>>> Do you have experience bisecting the kernel?  If so perhaps you can try
>>>> doing that.
>> But it looks like a genuine bug, not a regression.
> 
> Yeah, I was hoping it was introduced recently.
> 
>> Of course I can check some 3.x versions...
> 
> That would help a lot, thanks.
Same on 3.18, and that's the oldest kernel that can be built
on f23 (gcc5).
So that's a genuine bug after all, not a regression.
So does anyone have the AMD AthlonII X2 245 to try reproducing this?