linux-kernel - Re: BUG: sleeping function called from invalid context in tcf_chain0_head_change_cb

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Message-ID: <CAM_iQpWNSdx59iTTNO6GdyZ6NBAMD8=wON6Q7dvnhiX50pwEvQ@mail.gmail.com>
Date:   Tue, 17 Sep 2019 10:03:08 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     syzbot <syzbot+ac54455281db908c581e@...kaller.appspotmail.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        David Ahern <dsahern@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "hawk@...nel.org" <hawk@...nel.org>,
        Ido Schimmel <idosch@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...lanox.com>, Jiri Pirko <jiri@...nulli.us>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Petr Machata <petrm@...lanox.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        "xdp-newbies@...r.kernel.org" <xdp-newbies@...r.kernel.org>,
        "yhs@...com" <yhs@...com>
Subject: Re: BUG: sleeping function called from invalid context in tcf_chain0_head_change_cb_del

On Tue, Sep 17, 2019 at 1:27 AM Vlad Buslov <vladbu@...lanox.com> wrote:
> Hi Cong,
>
> Don't see why we would need qdisc tree lock while releasing the
> reference to (or destroying) previous Qdisc. I've skimmed through other
> scheds and it looks like sch_multiq, sch_htb and sch_tbf are also
> affected. Do you want me to send patches?

Yes, please do.