linux-kernel - Re: [PATCHv3] fs/proc: allow reporting eip/esp for all coredumping threads

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Date:   Wed, 29 May 2019 18:14:18 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Jan Luebbe <jlu@...gutronix.de>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andy Lutomirski <luto@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCHv3] fs/proc: allow reporting eip/esp for all coredumping
 threads

(ooh, Greg, let me do it!)

On Thu, 30 May 2019 02:58:59 +0200 John Ogness <john.ogness@...utronix.de> wrote:

> Commit 0a1eb2d474ed ("fs/proc: Stop reporting eip and esp in
> /proc/PID/stat") stopped reporting eip/esp and commit fd7d56270b52
> ("fs/proc: Report eip/esp in /prod/PID/stat for coredumping")
> reintroduced the feature to fix a regression with userspace core dump
> handlers (such as minicoredumper).
> 
> Because PF_DUMPCORE is only set for the primary thread, this didn't fix
> the original problem for secondary threads. Allow reporting the eip/esp
> for all threads by checking for PF_EXITING as well. This is set for all
> the other threads when they are killed. coredump_wait() waits for all
> the tasks to become inactive before proceeding to invoke a core dumper.
> 
> Fixes: fd7d56270b526ca3 ("fs/proc: Report eip/esp in /prod/PID/stat for coredumping")
> Reported-by: Jan Luebbe <jlu@...gutronix.de>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> ---
>  This is a rework of Jan's v1 patch that allows accessing eip/esp of all
>  the threads without risk of the task still executing on a CPU.
> 
>  The code chagnes are the same as v2. With v3 I included a "Fixes" tag,
>  fixed a typo in the commit message, and Cc'd stable.

No, the way to Cc stable is to add

Cc: <stable@...r.kernel.org> to the changelog metadata.

I've made these changes to my copy of this patch, thanks.