linux-kernel - Re: [syzbot] WARNING in kvm_mmu_notifier_invalidate_range

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Date:   Tue, 28 Dec 2021 22:26:16 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+4e697fe80a31aa7efe21@...kaller.appspotmail.com>
Cc:     changbin.du@...el.com, christian.brauner@...ntu.com,
        daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com,
        hkallweit1@...il.com, kuba@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pbonzini@...hat.com, syzkaller-bugs@...glegroups.com,
        yajun.deng@...ux.dev
Subject: Re: [syzbot] WARNING in kvm_mmu_notifier_invalidate_range_start

On Tue, Dec 28, 2021, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ea586a076e8a Add linux-next specific files for 20211224
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12418ea5b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a9c4e3dde2c568fb
> dashboard link: https://syzkaller.appspot.com/bug?extid=4e697fe80a31aa7efe21
> 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=15724985b00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12d1aedbb00000
> 
> The issue was bisected to:
> 
> commit e4b8954074f6d0db01c8c97d338a67f9389c042f
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Tue Dec 7 01:30:37 2021 +0000
> 
>     netlink: add net device refcount tracker to struct ethnl_req_info

Heh, while I'd love to blame someone else, there's zero chance this is the
offending commit.  The WARN repros on kvm/queue, it's likely related to the KVM
memslot changes queued for 5.17.  I'll take a look.