linux-kernel - Re: mm, vmstat: kernel BUG at mm/vmstat.c:1408!

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Date:	Tue, 12 Jan 2016 17:01:33 +0530
From:	Shiraz Hashim <shiraz.linux.kernel@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: mm, vmstat: kernel BUG at mm/vmstat.c:1408!

On Mon, Dec 21, 2015 at 6:38 PM, Christoph Lameter <cl@...ux.com> wrote:
> Index: linux/mm/vmstat.c
> ===================================================================
> --- linux.orig/mm/vmstat.c
> +++ linux/mm/vmstat.c
> @@ -1419,11 +1419,9 @@ void quiet_vmstat(void)
>         if (system_state != SYSTEM_RUNNING)
>                 return;
>
> -       do {
> -               if (!cpumask_test_and_set_cpu(smp_processor_id(), cpu_stat_off))
> -                       cancel_delayed_work(this_cpu_ptr(&vmstat_work));
> -
> -       } while (refresh_cpu_vm_stats(false));
> +       refresh_cpu_vm_stats(false);
> +       cancel_delayed_work(this_cpu_ptr(&vmstat_work));
>

shouldn't this be cancel_delayed_work_sync ?

> +       cpumask_set_cpu(smp_processor_id(), cpu_stat_off);
>

else ongoing vmstat_update can again encounter cpu_stat_off set ?

>  }
>

-- 
regards
Shiraz Hashim