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

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Date:	Wed, 10 Sep 2014 00:00:31 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Tejun Heo <tj@...nel.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay@...y.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wu Zhangjin <falcon@...zu.com>, Takashi Iwai <tiwai@...e.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>, hare@...e.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Benjamin Poirier <bpoirier@...e.de>,
	Santosh Rastapur <santosh@...lsio.com>,
	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 List <linux-scsi@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

On Tue, 9 Sep 2014, Luis R. Rodriguez wrote:

> By design it seems systemd should not allow worker processes to block
> indefinitely and in fact it currently uses the same timeout for all
> types of worker processes. 

And I whole-heartedly believe this is something that fundamentally needs 
to be addressed in systemd, not in the kernel.

This aproach is actually introducing a user-visible regressions. Look, for 
example, exec() never times out. Therefore if your system is on its knees, 
heavily overloaded (or completely broken), you are likely to be able to 
`reboot' it, because exec("/sbin/reboot") ultimately succeeds.

But with all the timeouts, dbus, "Failed to issue method call: Did 
not receive a reply" messages, this is getting close to impossible.

-- 
Jiri Kosina
SUSE Labs

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