linux-kernel - Re: [PATCH] printk: Add caller information to printk() output.

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Message-ID: <20190104073332.qxq2pi44xsmgokaq@wfg-t540p.sh.intel.com>
Date:   Fri, 4 Jan 2019 15:33:32 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Kevin Hilman <khilman@...libre.com>,
        "Li, Philip" <philip.li@...el.com>,
        Huang Ying <ying.huang@...el.com>
Subject: Re: [PATCH] printk: Add caller information to printk() output.

On Thu, Jan 03, 2019 at 07:27:41PM +0100, Dmitry Vyukov wrote:
>On Wed, Jan 2, 2019 at 5:09 PM Dmitry Vyukov <dvyukov@...gle.com> wrote:
>>
>> On Tue, Dec 18, 2018 at 9:58 AM Sergey Senozhatsky
>> <sergey.senozhatsky.work@...il.com> wrote:
>> >
>> > On (12/18/18 09:39), Petr Mladek wrote:
>> > >
>> > > Sergey, are you okay with this squashed patch, please?
>> > >
>> >
>> > Yeah. There are several minor nitpicks, but here is my
>> > Acked-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
>> >
>> >
>> > One final question - can syzbot folks confirm that the patch
>> > helps? Just curious.
>>
>> This slip through the cracks. Tetsuo pinged me and I am testing now.
>> Need to create a set of tests and update parsing code to handle this.
>
>I've pushed support for CONFIG_PRINTK_CALLER to syzkaller/syzbot:
>https://github.com/google/syzkaller/commit/7da2392541a49c3f17b2e7d24e04b84d72b965fb
>Let's see what happens. Limited local testing shows that it's working
>as intended and significatly improves quality of reports and ability
>to make sense out of kernel output.
>
>Tetsuo, thanks for your great persistence with this change!
>Sergey, Petr, thanks for reviews!
>
>+Fengguang, Kevin, maybe you will find this useful for 0-day/kernel-ci.

Thanks! We'll try out CONFIG_PRINTK_CALLER.

Regards,
Fengguang