linux-kernel - Re: [PATCH v3 00/26] KVM: x86: Halt and APICv overhaul

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e87ba370fd853452e763cf36c1cf94fa251185de.camel@redhat.com>
Date:   Thu, 09 Dec 2021 08:36:44 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        kvm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/26] KVM: x86: Halt and APICv overhaul

On Thu, 2021-12-09 at 00:04 +0000, Sean Christopherson wrote:
> On Thu, Dec 09, 2021, Maxim Levitsky wrote:
> > Host crash while running 32 bit VM and another 32 bit VM nested in it:
> > 
> > [  751.182290] BUG: kernel NULL pointer dereference, address: 0000000000000025
> > [  751.198234] #PF: supervisor read access in kernel mode
> > [  751.209982] #PF: error_code(0x0000) - not-present page
> > [  751.221733] PGD 3720f9067 P4D 3720f9067 PUD 3720f8067 PMD 0 
> > [  751.234682] Oops: 0000 [#1] SMP
> > [  751.241857] CPU: 8 PID: 54050 Comm: CPU 8/KVM Tainted: G           O      5.16.0-rc4.unstable #6
> > [  751.261960] Hardware name: LENOVO 20UF001CUS/20UF001CUS, BIOS R1CET65W(1.34 ) 06/17/2021
> > [  751.280475] RIP: 0010:is_page_fault_stale.isra.0+0x2a/0xa0 [kvm]
> 
> ...
> 
> > Oh well, not related to the patch series but just that I don't forget.
> > I need to do some throughfull testing on all the VMs I use.
> 
> This is my goof, I'll post a fix shortly.
> 
Thanks!

Best regards,
	Maxim Levitsky