From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: kvm: repeatable kernel crash with Athlon II cpu Date: Tue, 29 Mar 2016 17:37:25 +0200 Message-ID: <56FAA135.1080600@redhat.com> References: <56FA9DB1.4060704@list.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: Stas Sergeev , Linux kernel To: Stas Sergeev , kvm@vger.kernel.org Return-path: In-Reply-To: <56FA9DB1.4060704@list.ru> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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