linux-kernel - Re: clockevents_program_event WARN

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Date:	Thu, 2 May 2013 14:36:14 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: clockevents_program_event WARN_ON preventing boot.

On Thu, May 2, 2013 at 2:19 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> Can you please apply the following debug patch and provide the output?
>
> diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
> index c6d6400..b4d9622 100644
> --- a/kernel/time/clockevents.c
> +++ b/kernel/time/clockevents.c
> @@ -207,6 +207,8 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
>
>         if (unlikely(expires.tv64 < 0)) {
>                 WARN_ON_ONCE(1);
> +               printk_once(KERN_INFO "expires %llx, dev->next %llx\n",
> +                           expires.tv64, dev->next_event.tv64);
>                 return -ETIME;
>         }
>

[    3.450968] SMP alternatives: lockdep: fixing up alternatives
[    3.454454] ------------[ cut here ]------------
[    3.454470] WARNING: at kernel/time/clockevents.c:209
clockevents_program_event+0x3e/0x120()
[    3.454473] Modules linked in:
[    3.454479] CPU: 10 PID: 0 Comm: swapper/10 Not tainted
3.9.0-yh-08066-g1252014-dirty #1538
[    3.454481] Hardware name: Oracle Corporation  unknown       /
, BIOS 11016600    05/17/2011
[    3.454500]  0000000000000009 ffff88203e203ed8 ffffffff82091042
ffff88203e203f18
[    3.454518]  ffffffff81088990 ffff88203e203f08 ffff88203e20d000
80000000003d08ff
[    3.454526]  000000000000000a ffff881027557fd8 0000000000000000
ffff88203e203f28
[    3.454527] Call Trace:
[    3.454540]  <IRQ>  [<ffffffff82091042>] dump_stack+0x19/0x1b
[    3.454548]  [<ffffffff81088990>] warn_slowpath_common+0x70/0xa0
[    3.454552]  [<ffffffff810889da>] warn_slowpath_null+0x1a/0x20
[    3.454556]  [<ffffffff810e312e>] clockevents_program_event+0x3e/0x120
[    3.454560]  [<ffffffff810e360c>] tick_handle_periodic+0x4c/0x80
[    3.454566]  [<ffffffff820ae8cd>] smp_apic_timer_interrupt+0x8d/0xa3
[    3.454575]  [<ffffffff820adbef>] apic_timer_interrupt+0x6f/0x80
[    3.454583]  <EOI>  [<ffffffff810527f7>] ? default_idle+0x57/0xd0
[    3.454587]  [<ffffffff810527f5>] ? default_idle+0x55/0xd0
[    3.454591]  [<ffffffff81053078>] arch_cpu_idle+0x18/0x20
[    3.454595]  [<ffffffff810dbec5>] cpu_startup_entry+0x165/0x210
[    3.454603]  [<ffffffff8207f3cd>] start_secondary+0x1df/0x1e6
[    3.454626] ---[ end trace 2f2f1a2adee9c881 ]---
[    3.454628] expires 80000000003d08ff, dev->next 7fffffffffffffff
--
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