linux-kernel - Re: "fs/namei.c: keep track of nd->root refcount status" causes boot panic

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Message-ID: <CAA42JLZySdadoL5LAhofXZx3T41A9hm=_izyrRs0MHbSbMf3MA@mail.gmail.com>
Date:   Mon, 2 Sep 2019 22:22:21 -0700
From:   Dexuan-Linux Cui <dexuan.linux@...il.com>
To:     Qian Cai <cai@....pw>
Cc:     Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>, v-lide@...rosoft.com
Subject: Re: "fs/namei.c: keep track of nd->root refcount status" causes boot panic

On Mon, Sep 2, 2019 at 9:22 PM Qian Cai <cai@....pw> wrote:
>
> The linux-next commit "fs/namei.c: keep track of nd->root refcount status” [1] causes boot panic on all
> architectures here on today’s linux-next (0902). Reverted it will fix the issue.

I believe I'm seeing the same issue with next-20190902 in a Linux VM
running on Hyper-V (next-20190830 is good).

git-bisect points to the same commit in linux-next:
    e013ec23b823 ("fs/namei.c: keep track of nd->root refcount status")

I can reproduce the issue every time I reboot the system.

Thanks,
Dexuan