linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFyZOo=HzB_n3gLqswFsN1FcMdumaKLBk+fbhDD3wrvXnA@mail.gmail.com>
Date:	Thu, 4 Dec 2014 22:38:28 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sasha Levin <sasha.levin@...cle.com>
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 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..

                      Linus
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