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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Dmitry Vyukov <dvyukov@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>
Cc: Linux-MM <linux-mm@kvack.org>, Ingo Molnar <mingo@redhat.com>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH] lockdep: Add debug printk() for downgrade_write() warning.
Date: Thu, 10 Jan 2019 19:12:06 +0900	[thread overview]
Message-ID: <146b28b0-e69c-cf3d-2b0c-0c78110e3718@i-love.sakura.ne.jp> (raw)
In-Reply-To: <CACT4Y+Y=V-yRQN6YV_wXT0gejbQKTtUu7wrRmuPVojaVv6NFsQ@mail.gmail.com>

On 2019/01/07 14:58, Dmitry Vyukov wrote:
> On Mon, Jan 7, 2019 at 5:19 AM Andrew Morton <akpm@linux-foundation.org> wrote:
>> I tossed it in there.
>>
>> But I wonder if anyone is actually running this code.  Because
>>
>> --- a/lib/Kconfig.debug~info-task-hung-in-generic_file_write_iter
>> +++ a/lib/Kconfig.debug
>> @@ -2069,6 +2069,12 @@ config IO_STRICT_DEVMEM
>>
>>           If in doubt, say Y.
>>
>> +config DEBUG_AID_FOR_SYZBOT
>> +       bool "Additional debug code for syzbot"
>> +       default n
>> +       help
>> +         This option is intended for testing by syzbot.
>> +
> 
> 
> Yes, syzbot always defines this option:
> 
> https://github.com/google/syzkaller/blob/master/dashboard/config/upstream-kasan.config#L14
> https://github.com/google/syzkaller/blob/master/dashboard/config/upstream-kmsan.config#L9
> 
> It's meant specifically for such cases.
> 
> Tetsuo already got some useful information for past bugs using this feature.
> 

Andrew, you can drop this patch, for a patch that fixes this problem is already available
at https://lkml.kernel.org/r/1547093005-26085-1-git-send-email-longman@redhat.com .
Peter, please apply the fix from Waiman Long.

      parent reply	other threads:[~2019-01-10 10:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1546771139-9349-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp>
     [not found] ` <e1a38e21-d5fe-dee3-7081-bc1a12965a68@i-love.sakura.ne.jp>
2019-01-07  4:19   ` Andrew Morton
2019-01-07  5:58     ` Dmitry Vyukov
2019-01-07  5:58       ` Dmitry Vyukov
2019-01-09 11:47       ` Tetsuo Handa
2019-01-09 18:22         ` Waiman Long
2019-01-10 10:12       ` Tetsuo Handa [this message]

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