linux-kernel - Re: WARNING in __rcu_read

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Date:   Tue, 18 Dec 2018 20:12:04 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        syzbot <syzbot+43f6755d1c2e62743468@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josh Triplett <josh@...htriplett.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        netdev <netdev@...r.kernel.org>, Xin Long <lucien.xin@...il.com>
Subject: Re: WARNING in __rcu_read_unlock

On Tue, Dec 18, 2018 at 4:40 AM Stefano Brivio <sbrivio@...hat.com> wrote:
> Not as far as I know. The selftests checking this path, by design, only
> use supported configurations, they don't forge packets.
>
> Maybe it would be nice to have a semi-automated way to isolate and
> describe/name specific conditions found by syzbot via fuzzing and turn
> those into tests that are then repeated periodically. I'm not sure how
> that would look like, but I think it's still more maintainable than a
> pile of C reproducers with forged packets in selftests/net.
>
> Eric, Cong, Xin, as you also recently fixed a nice deal of similar cases
> reported by syzbot, what do you think? Did you ever feel the need to
> turn a syzbot reproducer into a regression test case?

I think it is a very good idea to archive these C reproducers in
tools/testing/selftests/. After this is done, kbuild bot could do these
regression tests, no longer need to bother syzbot to run them again. :)

Thanks.