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Subject: Re: [PATCH] kmemleak: Increase maximum early log entries to 1000000
To:     Nicolas Boichat <drinkcat@chromium.org>,
        Dmitry Vyukov <dvyukov@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Kees Cook <keescook@chromium.org>,
        Petr Mladek <pmladek@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        Sri Krishna chowdary <schowdary@nvidia.com>,
        Uladzislau Rezki <urezki@gmail.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Changbin Du <changbin.du@intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Catalin Marinas <catalin.marinas@arm.com>
References: <20190723072605.103456-1-drinkcat@chromium.org>
 <CACT4Y+bi5KkZ8igSeYVxjwtr8t0Vjz55gzWfAu_c8VMAqw0zPA@mail.gmail.com>
 <CANMq1KB8ECeRqNhSWyUf3amAkF7qvAmS3aU6rGNnZ=kUV3LC5Q@mail.gmail.com>
From:   Andrey Ryabinin <aryabinin@virtuozzo.com>
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Date:   Wed, 24 Jul 2019 12:00:53 +0300
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On 7/23/19 11:13 AM, Nicolas Boichat wrote:
> On Tue, Jul 23, 2019 at 3:46 PM Dmitry Vyukov <dvyukov@google.com> wrote:
>>
>> On Tue, Jul 23, 2019 at 9:26 AM Nicolas Boichat <drinkcat@chromium.org> wrote:
>>>
>>> When KASan is enabled, a lot of memory is allocated early on,
>>> and kmemleak complains (this is on a 4GB RAM system):
>>> kmemleak: Early log buffer exceeded (129846), please increase
>>>   DEBUG_KMEMLEAK_EARLY_LOG_SIZE
>>>
>>> Let's increase the upper limit to 1M entry. That would take up
>>> 160MB of RAM at init (each early_log entry is 160 bytes), but
>>> the memory would later be freed (early_log is __initdata).
>>
>> Interesting. Is it on an arm64 system?
> 
> Yes arm64. And this is chromiumos-4.19 tree. I didn't try to track
> down where these allocations come from...
> 

Is this still a problem in upstream tree? 4.19 doesn't have fed84c785270 ("mm/memblock.c: skip kmemleak for kasan_init()")