From: Dave Jones <davej@codemonkey.org.uk>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: run_timer_softirq gpf. tracing?
Date: Tue, 21 Mar 2017 15:45:06 -0400 [thread overview]
Message-ID: <20170321194506.hokyb24uqfq7hwf2@codemonkey.org.uk> (raw)
In-Reply-To: <alpine.DEB.2.20.1703211954170.3776@nanos>
On Tue, Mar 21, 2017 at 08:25:39PM +0100, Thomas Gleixner wrote:
> > RAX looks like list poison, and CR2 = 4, which is likely the ->next of a list,
> > with a NULL pointer.
>
> Certainly not on 64 bit. that would be 8. And CR2 is irrelevant here
> because that's a #GP not a #PF.
doh!
> The timer which expires has timer->entry.next == POISON2 !
>
> This has nothing to do with tracing, it's a classic list corruption. The
> bad news is that there is no trace of the culprit because that happens when
> some other timer expires after some random amount of time.
ah! Thanks for putting me back on the right path.
> If that is reproducible, then please enable debugobjects. That should
> pinpoint the culprit.
hit it twice today so far, so hopefully it'll reproduce.
thanks.
Dave
next prev parent reply other threads:[~2017-03-21 19:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-21 18:17 Dave Jones
2017-03-21 19:25 ` Thomas Gleixner
2017-03-21 19:45 ` Dave Jones [this message]
2017-03-21 20:14 ` run_timer_softirq gpf. [smc] Dave Jones
2017-03-21 21:45 ` Thomas Gleixner
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