linux-kernel - Re: [PATCH 2/2] Subject: printk: Don't trap random context in infinite log

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Message-ID: <20171108112229.200858cb@gandalf.local.home>
Date:   Wed, 8 Nov 2017 11:22:29 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        kernel-team@...com, Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] Subject: printk: Don't trap random context in
 infinite log_buf flush

On Tue, 7 Nov 2017 05:23:50 -0800
Tejun Heo <tj@...nel.org> wrote:

> Hello, Sergey.
> 
> On Tue, Nov 07, 2017 at 11:04:34AM +0900, Sergey Senozhatsky wrote:
> > just to make sure. there is a typo in Steven's patch:
> > 
> > 	while (!READ_ONCE(console_waiter))
> > 
> > should be
> > 
> > 	while (READ_ONCE(console_waiter))
> > 
> > is this the "tweaking" you are talking about?  
> 
> Oh, I was talking about tweaking the repro, but I'm not sure the above
> would change anything. 

No, it would change an awful lot.

It would cause two printers to access the consoles at the same time,
which would lead to unpredictable behavior.

-- Steve