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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     syzbot <syzbot+fe0c72f0ccbb93786380@syzkaller.appspotmail.com>,
        syzkaller-bugs@googlegroups.com, Ingo Molnar <mingo@elte.hu>,
        linux-kernel@vger.kernel.org, linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH] debugobject: don't wake up kswapd from fill_pool()
In-Reply-To: <d642e597-cf7d-b410-16ce-22dff483fd8e@I-love.SAKURA.ne.jp>
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 <20230511204458.819f9009d2ef8b46cc163191@linux-foundation.org>
 <d642e597-cf7d-b410-16ce-22dff483fd8e@I-love.SAKURA.ne.jp>
Date:   Fri, 12 May 2023 14:54:20 +0200
Message-ID: <87v8gxbthf.ffs@tglx>
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On Fri, May 12 2023 at 19:57, Tetsuo Handa wrote:
> On 2023/05/12 12:44, Andrew Morton wrote:
>> On Thu, 11 May 2023 22:47:32 +0900 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> wrote:
>> 
>>> syzbot is reporting lockdep warning in fill_pool(), for GFP_ATOMIC is
>>> (__GFP_HIGH | __GFP_KSWAPD_RECLAIM) which wakes up kswapd.
>>> Since fill_pool() might be called with arbitrary locks held,
>>> fill_pool() should not assume that holding pgdat->kswapd_wait is safe.

https://lore.kernel.org/lkml/871qjldbes.ffs@tglx/