netdev - Re: kernel BUG at net/rxrpc/local

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Message-ID: <CACT4Y+Y4cRgaRPJ_gz_53k85inDKq+X+bWmOTv1gPLo=Yod1=A@mail.gmail.com>
Date:   Wed, 31 Jul 2019 16:46:15 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     David Howells <dhowells@...hat.com>
Cc:     syzbot <syzbot+1e0edc4b8b7494c28450@...kaller.appspotmail.com>,
        Eric Biggers <ebiggers@...nel.org>,
        David Miller <davem@...emloft.net>,
        linux-afs@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: kernel BUG at net/rxrpc/local_object.c:LINE!

On Wed, Jul 31, 2019 at 4:30 PM David Howells <dhowells@...hat.com> wrote:
>
> Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> > Re bisection, I don't know if there are some more subtle things as
> > play (you are in the better position to judge that), but bisection log
> > looks good, it tracked the target crash throughout and wasn't
> > distracted by any unrelated bugs, etc. So I don't see any obvious
> > reasons to not trust it.
>
> Can you turn on:
>
>         echo 1 > /sys/kernel/debug/tracing/events/rxrpc/rxrpc_local/enable
>
> and capture the trace log at the point it crashes?

Please send a patch for testing that enables this tracing
unconditionally. This should have the same effect. There is no way to
hook into a middle of the automated process and arbitrary tune things.