linux-kernel - Re: [PATCH v4 1/6] timer: kasan: record timer stack

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Date:   Sat, 26 Sep 2020 00:59:35 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Marco Elver <elver@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 1/6] timer: kasan: record timer stack

On Fri, Sep 25 2020 at 17:15, Walter Wu wrote:
> On Fri, 2020-09-25 at 10:55 +0200, Thomas Gleixner wrote:
>> > We don't want to replace DEBUG_OBJECTS_TIMERS with this patches, only
>> > hope to use low overhead(compare with DEBUG_OBJECTS_TIMERS) to debug
>> 
>> KASAN has lower overhead than DEBUG_OBJECTS_TIMERS? Maybe in a different
>> universe.
>> 
> I mean KASAN + our patch vs KASAN + DEBUG_OBJECTS_TIMERS. The front one
> have the information to the original caller and help to debug. It is
> smaller overhead than the one behind.

For ONE specific problem related to timers and you have still not shown
a single useful debug output where this information helps to debug
anything.

> I agree your saying, so that I need to find out a use case to explain to
> you.

Indeed.

Thanks,

        tglx