From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751326AbcGLUIx (ORCPT <rfc822;w@1wt.eu>);
	Tue, 12 Jul 2016 16:08:53 -0400
Received: from mail-pa0-f47.google.com ([209.85.220.47]:36637 "EHLO
	mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750947AbcGLUIv (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 12 Jul 2016 16:08:51 -0400
Date: Tue, 12 Jul 2016 13:08:34 -0700
From: Viresh Kumar <viresh.kumar@linaro.org>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
        Jan Kara <jack@suse.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Tejun Heo <tj@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        vlevenetz@mm-sol.com, vaibhav.hiremath@linaro.org,
        alex.elder@linaro.org, johan@kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Linux PM <linux-pm@vger.kernel.org>
Subject: Re: [Query] Preemption (hogging) of the work handler
Message-ID: <20160712200834.GO4695@ubuntu>
References: <20160701172232.GD28719@htj.duckdns.org>
 <20160706182842.GS2671@ubuntu>
 <20160711102603.GI12410@quack2.suse.cz>
 <20160711154438.GA528@swordfish>
 <20160711223501.GI4695@ubuntu>
 <20160712093805.GA498@swordfish>
 <20160712125243.GA8597@pathway.suse.cz>
 <20160712131203.GN4695@ubuntu>
 <20160712171113.GD4695@ubuntu>
 <CAJZ5v0jNgDkkBAX0teTo8MEHa2f+5+TAmiyFWwvEUjTkEez9Jg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAJZ5v0jNgDkkBAX0teTo8MEHa2f+5+TAmiyFWwvEUjTkEez9Jg@mail.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 12-07-16, 21:59, Rafael J. Wysocki wrote:
> It looks like a new printk() waits for a previous one to make progress
> and since progress cannot be made under the suspend conditions, it
> waits forever.

Thanks.

Maybe, but to mention this clearly again, this doesn't happen
every time. Sometime it takes 100 suspend/resume cycles to hit this
thing.

Lets see what Jan and Sergey have to say on this, as they were the
ones who wrote these patches :)

-- 
viresh