linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <1417640218.11261.2@mail.thefacebook.com>
Date:	Wed, 3 Dec 2014 15:56:58 -0500
From:	Chris Mason <clm@...com>
To:	Dave Jones <davej@...hat.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4



On Wed, Dec 3, 2014 at 3:11 PM, Dave Jones <davej@...hat.com> wrote:
> On Wed, Dec 03, 2014 at 02:59:58PM -0500, Chris Mason wrote:
> 
>  > You've also mentioned a few times where messages stopped hitting 
> the
>  > console?
>  >
>  > commit 5874af2003b1aaaa053128d655710140e3187226
>  > Author: Jan Kara <jack@...e.cz>
>  > Date:   Wed Aug 6 16:09:10 2014 -0700
>  >
>  >     printk: enable interrupts before calling
>  > console_trylock_for_printk()
> 
> Hmm..

Jan Kara has been talking about printk deadlocks for some time.  I 
wouldn't have expected it to get worse since 3.16, but we do have a few 
printk cleanups and fixes in there.

-chris



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