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From: Jonny Grant <jg@jguk.org>
To: Jakub Wilk <jwilk@jwilk.net>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>, linux-man@vger.kernel.org
Subject: Re: core(5)
Date: Sat, 6 Jun 2020 16:45:11 +0100	[thread overview]
Message-ID: <e8283646-38fd-b9a8-2056-547fecaeb182@jguk.org> (raw)
In-Reply-To: <20200606145003.x37j5hywuyn32lpf@jwilk.net>



On 06/06/2020 15:50, Jakub Wilk wrote:
> * Jonny Grant <jg@jguk.org>, 2020-06-06, 14:18:
>> 3) Could i ask to clarify my understanding. For this "The binary being executed by the process does not have read
>>          permission enabled."
>> -- is this when the binary permissions are changed after it starts running?
> 
> No, AFAICS the permission check is done when the process starts.

How can the process start if the binary file doesn't have read permissions enabled?

>> 4) I noticed %P always gave me P1200 even after a reboot I recall, I had expected it be '1', do you see similar?
> 
> Here %P expands to the pid of the process, as expected:
> 
>    $ uname -rv
>    5.6.0-2-amd64 #1 SMP Debian 5.6.14-1 (2020-05-23)
> 
>    $ sudo sysctl -w kernel.core_pattern="%P-%e-%s.core"
>    kernel.core_pattern = %P-%e-%s.core
> 
>    $ ulimit -c unlimited
> 
>    $ sh -c 'kill -ABRT $$'
>    Aborted (core dumped)
> 
>    $ ls *.core
>    7154-sh-6.core

My apologies, it was P1000. This was from two different runs, 2 days apart.

I think this was "P%P-T%i%e-%s-T%t". I tried to reproduce today, but couldn't

-rw------- 1 jonny jonny  99041280 May 27 21:42 P1000-T18441Process-5-T1590612166.core
-rw------- 1 jonny jonny 104407040 May 29 23:24 P1000-T5804Process-5-T1590791098.core

Cheers, Jonny

  reply	other threads:[~2020-06-06 15:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-06 13:18 core(5) Jonny Grant
2020-06-06 14:50 ` core(5) Jakub Wilk
2020-06-06 15:45   ` Jonny Grant [this message]
2020-06-06 18:32     ` core(5) Jakub Wilk
2020-06-06 19:39       ` core(5) Michael Kerrisk (man-pages)
2020-06-06 21:16         ` core(5) Jonny Grant
2020-06-08 16:18           ` core(5) Michael Kerrisk (man-pages)
2020-06-08 16:06 ` core(5) Michael Kerrisk (man-pages)

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