linux-kernel - Re: [syzbot] kernel BUG in kvm_read_guest_offset

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Message-ID: <1b1729ec-f94e-98ac-e76c-bad1c76467c7@redhat.com>
Date:   Wed, 24 Nov 2021 12:25:32 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot <syzbot+7b7db8bb4db6fd5e157b@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [syzbot] kernel BUG in kvm_read_guest_offset_cached

On 11/24/21 12:18, Vitaly Kuznetsov wrote:
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    4c388a8e740d Merge tag 'zstd-for-linus-5.16-rc1' of git://..
>> git tree:       upstream
>> console output:https://syzkaller.appspot.com/x/log.txt?x=171ff6eeb00000
>> kernel config:https://syzkaller.appspot.com/x/.config?x=6d3b8fd1977c1e73
>> dashboard link:https://syzkaller.appspot.com/bug?extid=7b7db8bb4db6fd5e157b
>> 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.
> No worries, I think I do.
> 

FWIW I have already posted a patch.  Thanks for the reproducer though!

Paolo