linux-kernel - Re: [syzbot] [kvm?] WARNING in kvm_arch_vcpu_ioctl

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Message-ID: <ZBNvrx3Q9Wa3WqXL@google.com>
Date:   Thu, 16 Mar 2023 19:36:15 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+8accb43ddc6bd1f5713a@...kaller.appspotmail.com>
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        jarkko@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: [syzbot] [kvm?] WARNING in kvm_arch_vcpu_ioctl_run (4)

On Thu, Mar 16, 2023, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ee3f96b16468 Merge tag 'nfsd-6.3-1' of git://git.kernel.or..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=11622f64c80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cab35c936731a347
> dashboard link: https://syzkaller.appspot.com/bug?extid=8accb43ddc6bd1f5713a
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15bd61acc80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17402eb0c80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/a7ac3e540d6d/disk-ee3f96b1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/604b5042d73d/vmlinux-ee3f96b1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/5a6d400b42b5/bzImage-ee3f96b1.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8accb43ddc6bd1f5713a@...kaller.appspotmail.com
> 
> kvm_intel: KVM_SET_TSS_ADDR needs to be called before running vCPU
> kvm_intel: set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5082 at arch/x86/kvm/x86.c:11060 kvm_arch_vcpu_ioctl_run+0x2464/0x2af0 arch/x86/kvm/x86.c:11060
> Modules linked in:
> CPU: 0 PID: 5082 Comm: syz-executor178 Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
> RIP: 0010:kvm_arch_vcpu_ioctl_run+0x2464/0x2af0 arch/x86/kvm/x86.c:11060

Same thing reported by another syzkaller instance, I'll post fixes in the not too
distant future.

https://lore.kernel.org/all/ZBNrWZQhMX8AHzWM@google.com