Re: frequent lockups in 3.18rc4

From: Sasha Levin
Date: Wed Dec 24 2014 - 09:00:08 EST

On 12/23/2014 09:56 AM, Dave Jones wrote:
> On Mon, Dec 22, 2014 at 03:59:19PM -0800, Linus Torvalds wrote:
> > But in the meantime please do keep that thing running as long as you
> > can. Let's see if we get bigger jumps. Or perhaps we'll get a negative
> > result - the original softlockup bug happening *without* any bigger
> > hpet jumps.
> It's been going for 18 hours, with just a bunch more of those hpet
> messages, all in the same range. I'll leave it go a few more hours,
> before I have to wipe it, but I've got feel-good vibes about this.
> Even if that patch isn't the solution, It seems like we're finally
> looking in the right direction.

I've got myself a physical server to play with, and running trinity on it
seems to cause similar stalls:

2338.389210] INFO: rcu_sched self-detected stall on CPU[ 2338.429153] INFO: rcu_sched detected stalls on CPUs/tasks:[ 2338.429164] 16: (5999 ticks this GP) idle=4b5/140000000000001/0 softirq=24859/24860 last_accelerate: 039d/1b78, nonlazy_posted: 64, ..
[ 2338.429165]
[ 2338.680231] 16: (5999 ticks this GP) idle=4b5/140000000000001/0 softirq=24859/24860 last_accelerate: 039d/1b91, nonlazy_posted: 64, ..
[ 2338.828353] (t=6044 jiffies g=16473 c=16472 q=4915881)

Oddly enough, there's no stacktrace...

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