linux-kernel - Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

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Message-ID: <20140905105949.GA22778@redhat.com>
Date:	Fri, 5 Sep 2014 12:59:49 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	gregkh@...uxfoundation.org, dmitry.torokhov@...il.com,
	falcon@...zu.com, tiwai@...e.de, tj@...nel.org,
	arjan@...ux.intel.com, linux-kernel@...r.kernel.org, hare@...e.com,
	akpm@...ux-foundation.org, penguin-kernel@...ove.sakura.ne.jp,
	joseph.salisbury@...onical.com, bpoirier@...e.de,
	santosh@...lsio.com, "Luis R. Rodriguez" <mcgrof@...e.com>,
	Kay Sievers <kay@...y.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

On 09/04, Luis R. Rodriguez wrote:
>
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> The new umh kill option has allowed kthreads to receive
> kill signals but they are generally accepting all sources
> of kill signals

And I think this is right,

> while the original motivation was to enable
> through the OOM from sending the kill.

even if the main concern was OOM.

> Users can provide a log output and it should be clear on
> the trace what probe / driver got the kill signal.

Well, if you need a WARN output, perhaps you could just add
WARN_ON(fatal_signal_pending()) at the end of load_module() ?

Not only kthread_create() can fail if systemd sends SIGKILL.

> Although Oleg had rejected a
> similar change a while ago

And honestly, I still dislike this change.

Oleg.

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