netdev - Re: Soft lockup issue in Linux 4.1.9

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Date:	Fri, 2 Oct 2015 23:04:29 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Eric Dumazet <edumazet@...gle.com>,
	Holger Hoffstätte 
	<holger.hoffstaette@...glemail.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: Soft lockup issue in Linux 4.1.9

On Fri, 2 Oct 2015, Eric Dumazet wrote:
> On Fri, 2015-10-02 at 22:04 +0200, Thomas Gleixner wrote:
> 
> > What makes sure, that the timer cannot be readded while that timer
> > callback is running?
> 
> What is exactly your question ?

CPU0   	  	       		CPU1

timer expires
  callback
				add timer
  timer_pending() == true
  ===> del_timer_sync()

I was just curious how this is prevented as I got lost in the
networking code as usual :)

Thanks,

	tglx

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