linux-kernel - Re: [KVM] 2efd61a608: WARNING:at_arch/x86/kvm/../../../virt/kvm/kvm_main.c:#mark_page_dirty_in

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Date:   Thu, 27 Jan 2022 08:52:54 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     kernel test robot <oliver.sang@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [KVM] 2efd61a608:
 WARNING:at_arch/x86/kvm/../../../virt/kvm/kvm_main.c:#mark_page_dirty_in_slot

On 1/27/22 03:30, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-9):
> 
> commit: 2efd61a608b0039911924d2e5d7028eb37496e85 ("KVM: Warn if mark_page_dirty() is called without an active vCPU")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> [ 123.817787][ T9801] RIP: 0010:mark_page_dirty_in_slot (arch/x86/kvm/../../../virt/kvm/kvm_main.c:3160 (discriminator 1))
> [ 123.935134][ T9801] __kvm_write_guest_page (arch/x86/kvm/../../../virt/kvm/kvm_main.c:2947)
> [ 123.940399][ T9801] kvm_write_guest (arch/x86/kvm/../../../virt/kvm/kvm_main.c:2978)
> [ 123.944953][ T9801] kvm_hv_invalidate_tsc_page (arch/x86/kvm/hyperv.c:1220)

Hi, this is known and should be fixed soon.

Paolo