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

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Message-ID: <ZEMH+mqbqzOI4soo@google.com>
Date:   Fri, 21 Apr 2023 15:02:34 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+094a74444165dbcd3a54@...kaller.appspotmail.com>
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        kvm@...r.kernel.org, linux-kernel@...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_tdp_mmu_invalidate_all_roots

On Fri, Apr 21, 2023, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d3e1ee0e67e7 Add linux-next specific files for 20230421
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16ac3de0280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=53c789efbcc06cf6
> dashboard link: https://syzkaller.appspot.com/bug?extid=094a74444165dbcd3a54
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/c558a9e1fe6a/disk-d3e1ee0e.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/2ec100a34c4c/vmlinux-d3e1ee0e.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/1afcd9936dc1/bzImage-d3e1ee0e.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+094a74444165dbcd3a54@...kaller.appspotmail.com

Time to see if syzbot gets confused by a fix that was squashed into the guilty
commit.

#syz fix: KVM: x86: Preserve TDP MMU roots until they are explicitly invalidated