linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 05 Dec 2014 10:03:10 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Dâniel Fraga <fragabr@...il.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 12/05/2014 01:38 AM, Linus Torvalds wrote:
> On Thu, Dec 4, 2014 at 9:00 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>> >
>> > Just to add to this: I've enabled the simplest level of verbosity in the fault
>> > injection options, and RCU stalls are again easy to trigger:
> Where do you log to?
> 
> In particular, do you have some serial line logging enabled (perhaps
> even without anybody listening)? Or network logging?
> 
> We've definitely had cases where logging itself is so slow that it
> triggers watchdogs etc. Logging to a serial line can take for*ever* in
> modern terms..

Yes, it's going to a serial line, but it's only about 100 lines/second on
average. I wouldn't expect it to cause anything to hang!


Thanks,
Sasha
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