linux-kernel - Re: kvm: repeatable kernel crash with Athlon II cpu

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Date:	Tue, 29 Mar 2016 17:37:25 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Stas Sergeev <stsp@...t.ru>, kvm@...r.kernel.org
Cc:	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: kvm: repeatable kernel crash with Athlon II cpu



On 29/03/2016 17:22, 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?

> I tried to put the debug printfs into dosemu, and it seems
> the crash happens on KVM_RUN ioctl, but of course the one
> can't say for sure when an instant reboot happens. Yet if
> I disable the KVM use, or try on a different CPU, there is
> no crash too, so I am pretty sure it is the KVM bug.

Yes, that's likely.

> 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.

Paolo