From: John Ogness <john.ogness@linutronix.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Luebbe <jlu@pengutronix.de>,
Alexey Dobriyan <adobriyan@gmail.com>,
Andy Lutomirski <luto@kernel.org>,
kernel@pengutronix.de, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] proc: report eip and esp for all threads when coredumping
Date: Sun, 26 May 2019 21:41:28 +0200 [thread overview]
Message-ID: <87d0k5f1g7.fsf@linutronix.de> (raw)
In-Reply-To: <20190525143220.e771b7915d17f22dad1438fa@linux-foundation.org> (Andrew Morton's message of "Sat, 25 May 2019 14:32:20 -0700")
Hi Andrew,
On 2019-05-25, Andrew Morton <akpm@linux-foundation.org> wrote:
> Please send along a signed-off-by: for this?
From my response:
On 2019-05-25, John Ogness <john.ogness@linutronix.de> wrote:
> AFAICT core_state does not need to be set before the other lines. But
> there may be some side effects that I overlooked!
The changes I showed were more of a suggestion for Jan than an actual
patch. For a signed-off-by I'll need to do some deeper looking to make
sure what I suggested was safe. Also, we probably need a barrier to make
sure the task flag is cleared before setting core_state. Or instead, we
probably should set core_state after releasing the siglock, setting it
where the PF_DUMPCORE flag is set.
It seems to me that checking for a non-NULL core_state and checking for
the PF_DUMPCORE flag are both used throughout the kernel to identify
core dumps in action. So I think it makes sense to set them "at the same
time". (Or perhaps eliminate PF_DUMPCORE altogether and just use a
non-NULL core_state to identify core dumping.)
I will take a closer look at this.
John Ogness
next prev parent reply other threads:[~2019-05-26 19:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-22 16:16 [PATCH] proc: report eip and esp for all threads when coredumping Jan Luebbe
2019-05-22 17:13 ` Alexey Dobriyan
2019-05-22 18:00 ` Andrew Morton
2019-05-23 8:15 ` Jan Lübbe
2019-05-24 23:50 ` John Ogness
[not found] ` <20190525143220.e771b7915d17f22dad1438fa@linux-foundation.org>
2019-05-26 19:41 ` John Ogness [this message]
2019-05-29 8:55 ` [PATCHv2] fs/proc: allow reporting eip/esp for all coredumping threads John Ogness
2019-05-29 21:55 ` Andrew Morton
2019-05-30 0:58 ` [PATCHv3] " John Ogness
2019-05-30 1:14 ` Andrew Morton
2019-06-03 19:54 ` Jan Lübbe
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