Messages in this thread | | | Date | Mon, 17 Dec 2007 23:05:55 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: soft lockup - CPU#1 stuck for 15s! [swapper:0] |
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On Mon, 17 Dec 2007, Parag Warudkar wrote: > On Dec 17, 2007 3:05 AM, Thomas Gleixner <tglx@linutronix.de> wrote: > > Sigh. You did not have the debug patch applied anymore, which printks > > the timer_list data ? Can you apply it again and provide the output > > please ? > > > > This keeps getting more and more weird - This time I was running with > CONFIG_CPU_IDLE=N and I have ton of soft lockups after 14hr uptime.
It's more than weird.
> now at 39080147128907 nsecs
> .idle_entrytime : 39080384013047 nsecs
The time, when we entered idle on CPU#0 is in the future.
> .tick_stopped : 0
But the tick is not stopped, that means CPU#0 has work to do
On CPU#1 idle entry just happened:
> .idle_entrytime : 39079996603653 nsecs
> now at 40490254040892 nsecs
> .idle_entrytime : 40490492012833 nsecs
Again, idle_entry on CPU#0 is in the future.
On CPU#1 the idle entry was at: > .idle_entrytime : 40489996578090 nsecs
which means: 0.257462802 sec. ago
> now at 40700144217096 nsecs
Aarg. On CPU#0 this is consistently in the future:
> .idle_entrytime : 40700372012887 nsecs
I'm really confused.
> .idle_entrytime : 40699996620694 nsecs > .idle_sleeptime : 40540536046589 nsecs > .last_jiffies : 10100000 > .next_jiffies : 10100467 > .idle_expires : 40701864000000 nsecs > jiffies: 10100158 > > > Tick Device: mode: 1 > Clock Event Device: hpet > max_delta_ns: 2147483647 > min_delta_ns: 3352 > mult: 61496110 > shift: 32 > mode: 3 > next_event: 40700692000000 nsecs > set_next_event: hpet_legacy_next_event > set_mode: hpet_legacy_set_mode > event_handler: tick_handle_oneshot_broadcast > tick_broadcast_mask: 00000003
Here is the next inconsistent data:
> tick_broadcast_oneshot_mask: 00000003
CPU#1 just woke up. That means the broadcast oneshot mask must be cleared for CPU#1.
Some real strange thing is going on in your box.
I try to come up with some more debug patches tomorrow.
tglx
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