linux-kernel - Re: ktime_get_ts64() splat during resume

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Date:	Fri, 17 Jun 2016 13:53:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Borislav Petkov <bp@...en8.de>
cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: ktime_get_ts64() splat during resume

On Fri, 17 Jun 2016, Borislav Petkov wrote:
> look what I've found this morning during resume:
> 
> [   45.746236] BUG: unable to handle kernel done.
> [   45.752542] NULL pointer dereference at 0000000000000001
> [   45.752544] IP: [<0000000000000001>] 0x1

> static inline cycle_t timekeeping_get_delta(struct tk_read_base *tkr)
> {
>         cycle_t cycle_now, delta;
> 
>         /* read clocksource */
>         cycle_now = tkr->read(tkr->clock);
> 		    ^^^^^^^^^^
> 
> Ring any bells about something corrupting tk_core.timekeeper.tkr_mono or
> it being uninitialized after suspend?

It must be initialized otherwise you won't reach suspend. I have no idea how
that can happen.

Thanks,

	tglx