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

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Date:   Mon, 03 Jun 2019 21:54:08 +0200
From:   Jan Lübbe <jlu@...gutronix.de>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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

On Thu, 2019-05-30 at 02:58 +0200, John Ogness 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>

Tested-by: Jan Luebbe <jlu@...gutronix.de>

I've tested your patch and can confirm that eip/esp is accessible for
all threads again.

Thanks,
Jan
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