linux-kernel - Re: [clear_page] 0ad07c8104 BUG: unable to handle kernel NULL pointer dereference at 0000000000000040

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Message-ID: <20170219135019.tiaed3zl5t5vr45k@pd.tnic>
Date:   Sun, 19 Feb 2017 14:50:19 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     LKP <lkp@...org>, lkml <linux-kernel@...r.kernel.org>,
        Ye Xiaolong <xiaolong.ye@...el.com>
Subject: Re: [clear_page] 0ad07c8104 BUG: unable to handle kernel NULL
 pointer dereference at 0000000000000040

On Sun, Feb 19, 2017 at 09:06:51AM +0800, Fengguang Wu wrote:
> Yes if we add it as a line below the branch URL, it could be a time saver.

Right.

> Since it's hard to teach ALL people about the rule, it'd be best if we
> can work w/o any rules -- unless you want to be accurate&helpful or to
> customize test behaviors.
> 
> Since we already tested the original patch/commit (hence the report),
> we should know where the fixup should be applied to. And it'd be
> reasonably easy to tell whether the fix is incremental or a
> replacement -- just try git-am onto the original commit first, if
> failed, continue to try the parent commit. For old bugs the fix could
> be against linus/master or linux-next/master, which could be tried too.

Makes sense.

> Yes, that'd be most convenient. In general the email interface could
> be something like this:
> 
>        # "key: value" fields; if you Re: to an earlier bug report, they can be auto retrieved
>        compiler: gcc-6 # optional
>        base-commit: v4.10-rc8 # the robot knows kernel commits from hundreds of public git trees
>        ---
>        the patch
>        ---
>        attach kconfig files

Yap, just stick those rules somewhere on a website.

Btw, this is not only useful for a follow-on, fix patch but also for
initial test request. For example, I want to backport patch to stable
and would like to run it on a bunch of kernels:

base-commit: v4.4-stable, v4.9-stable, ...

i.e., a list of trees to apply it to. I believe people might like this a
lot.

Or, for example, a patch touching a bunch of arches and author doesn't
necessarily have access to all those different toolchains. Shoot a mail
to the 0day bot:

base-commit: linus/master
arch: x86_64, powerpc, sparc, ...

Would be very useful too.

Anyway, just a couple of ideas.

What would also be cool if you guys had a 0day bot howto with all those
things we should pay attention to and we can go and look up.

Thanks!

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--