linux-kernel - Re: adjtimex EINVALs in 3.18.5 (and 3.19)

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Date:	Mon, 2 Feb 2015 10:02:59 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: adjtimex EINVALs in 3.18.5 (and 3.19)

On Mon, Feb 2, 2015 at 5:34 AM, Josh Boyer <jwboyer@...oraproject.org> wrote:
> Hi Sasha and John,
>
> As we rolled out 3.18.5 in Fedora, we've had a number of people
> complain about chrony no longer working when they reboot.  It seems
> the calls to adjtimex chrony is making are failing, and then it fails
> to start.  Looking at the changelog, I see "time: adjtimex: Validate
> the ADJ_FREQUENCY values" is in 3.18.5.
>
> Here is the log from one of the bugs[1]:
>
> Jan 31 08:33:17 elissa.gathman.org chronyd[722]: Frequency -35.554 +/-
> 1.838 ppm read from /var/lib/chrony/drift
> Jan 31 08:33:17 elissa.gathman.org chronyd[722]: Fatal error :
> adjtimex failed for set_frequency, freq_ppm=-3.5554e+01
> required_freq=3.5554e+01 required_tick=10000
> Jan 31 08:33:17 elissa.gathman.org chronyd[718]: adjtimex failed for
> set_frequency, freq_ppm=-3.5554e+01 required_freq=3.5554e+01
> required_tick=10000
>
> I have no idea if what it's trying to do is valid or not, but it
> definitely isn't happy.  And that is kind of the crux of the issue.
> If those values are invalid now, what should these users do?  Should
> they delete the drift file?  All they know is that something that
> worked before doesn't.
>
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1188074


Thanks for the heads up!
This is the second report that landed in my box this morning so there
def is an issue and I'm working on it.

thanks
-john
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