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From: Prakash Gupta <guptap@codeaurora.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: mhocko@suse.com, vbabka@suse.cz, will.deacon@arm.com,
	catalin.marinas@arm.com, iamjoonsoo.kim@lge.com,
	rmk+kernel@arm.linux.org.uk, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH 1/2] arm64: stacktrace: avoid listing stacktrace functions in stacktrace
Date: Thu, 31 Aug 2017 11:58:31 +0530
Message-ID: <9ce9206f-cffa-99c5-2a34-e5988bd0b603@codeaurora.org> (raw)
In-Reply-To: <20170830132828.0bf9b9bc64f51362a64a6694@linux-foundation.org>



On 8/31/2017 1:58 AM, Andrew Morton wrote:
> On Wed, 30 Aug 2017 13:02:22 +0530 Prakash Gupta <guptap@codeaurora.org> wrote:
> 
>> The stacktraces always begin as follows:
>>
>>   [<c00117b4>] save_stack_trace_tsk+0x0/0x98
>>   [<c0011870>] save_stack_trace+0x24/0x28
>>   ...
>>
>> This is because the stack trace code includes the stack frames for itself.
>> This is incorrect behaviour, and also leads to "skip" doing the wrong thing
>> (which is the number of stack frames to avoid recording.)
>>
>> Perversely, it does the right thing when passed a non-current thread.  Fix
>> this by ensuring that we have a known constant number of frames above the
>> main stack trace function, and always skip these.
>>
>> This was fixed for arch arm by Commit 3683f44c42e9 ("ARM: stacktrace: avoid
>> listing stacktrace functions in stacktrace")
> 
> I can take this (with acks, please?)
> 
> 3683f44c42e9 has a cc:stable but your patch does not.  Should it?
> 

My bad, it should be copied to stable as well.

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  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-30  7:32 Prakash Gupta
2017-08-30  7:32 ` [PATCH 2/2] mm, page_owner: Skip unnecessary stack_trace entries Prakash Gupta
2017-08-31  7:34   ` Vlastimil Babka
2017-09-01  5:00     ` Prakash Gupta
2017-08-30 20:28 ` [PATCH 1/2] arm64: stacktrace: avoid listing stacktrace functions in stacktrace Andrew Morton
2017-08-31  6:28   ` Prakash Gupta [this message]
2017-09-04 10:29   ` Catalin Marinas

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