linux-kernel - Re: "systemd[1]: Failed to apply local time delta" with v4.7-rc1

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Date:	Tue, 31 May 2016 11:24:00 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Baolin Wang <baolin.wang@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: "systemd[1]: Failed to apply local time delta" with v4.7-rc1

On Mon, May 30, 2016 at 7:13 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> Hi,
>
> I noticed that when I boot my Lenovo Yoga 900 with v4.7-rc1 I get
> following error from systemd:
>
>   systemd[1]: Failed to apply local time delta, ignoring: Invalid argument
>
> and my system time is left being 180 minutes off.
>
> With following commits reverted it works fine:
>
>   86d3473224b0 time: Introduce do_sys_settimeofday64()
>   457db29bfcfd security: Introduce security_settime64()
>
> and systemd prints:
>
>   systemd[1]: RTC configured in localtime, applying delta of 180 minutes to system time.
>
> From systemd source code it seems to use Linux specific feature to "warp" the
> system clock according the timezone passed in:
>
>   clock_set_timezone() {
>         const struct timeval *tv_null = NULL;
>
>         ...
>
>         /*
>          * If the RTC does not run in UTC but in local time, the very first
>          * call to settimeofday() will set the kernel's timezone and will warp the
>          * system clock, so that it runs in UTC instead of the local time we
>          * have read from the RTC.
>          */
>         if (settimeofday(tv_null, &tz) < 0)
>                 return -errno;
>         if (min)
>                 *min = minutesdelta;
>
> With commit 86d3473224b0 it seems that do_sys_settimeofday() started returning
> -EINVAL when tv is NULL which seems to break the above.
>
> Is this intentional or am I missing something?

:(
No, that wasn't intentional. Thanks for the report. I'll try to sort
it out here shortly.

thanks
-john