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From: Yong Zhang <yong.zhang0@gmail.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Stanislaw Gruszka <sgruszka@redhat.com>,
	"John W. Linville" <linville@tuxdriver.com>,
	linux-wireless@vger.kernel.org
Subject: Re: [3.2-rc3] 100% CPU usage while in del_timer_sync from iwl3945_rs_free_sta
Date: Thu, 1 Dec 2011 10:09:45 +0800	[thread overview]
Message-ID: <20111201020945.GA5932@zhy> (raw)
In-Reply-To: <20111129100727.GD2675@tiehlicka.suse.cz>

On Tue, Nov 29, 2011 at 11:07:27AM +0100, Michal Hocko wrote:
> Looks we are stuck in lock_timer_base loop. I am not familiar with the
> code but either base is NULL or we are racing with timer->base changes.
> I guess that the first one sounds more probable. The timer in question
> is &rs_sta->rate_scale_flush.

FYI

If you could apply below commits in -tip/core/debugobjects
dc4218b timer: Use debugobjects to catch deletion of uninitialized timers
fb16b8c timer: Setup uninitialized timer with a stub callback
b84d435 debugobjects: Extend to assert that an object is initialized
feac18d debugobjects: Be smarter about static objects

and enable DEBUG_OBJECTS_TIMERS, maybe you can catch something easily.

Thanks,
Yong

      parent reply	other threads:[~2011-12-01  2:09 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-29 10:07 [3.2-rc3] 100% CPU usage while in del_timer_sync from iwl3945_rs_free_sta Michal Hocko
2011-11-29 11:39 ` Stanislaw Gruszka
2011-11-30 10:10   ` Michal Hocko
2011-11-30 14:23     ` Stanislaw Gruszka
2011-11-30 14:03       ` Michal Hocko
2011-11-30 15:39         ` Stanislaw Gruszka
2011-12-01  8:58           ` Michal Hocko
2011-12-01 10:55             ` Michal Hocko
2011-12-01 11:59               ` Stanislaw Gruszka
2011-12-01 12:44                 ` Michal Hocko
2011-12-01 12:55                   ` Stanislaw Gruszka
2011-12-01 13:13                     ` Eliad Peller
2011-12-01 13:31                       ` Stanislaw Gruszka
2011-12-01 13:37                       ` Sedat Dilek
2011-12-01 14:05                   ` Michal Hocko
2011-12-01 14:23                     ` Eliad Peller
2011-12-01 15:45                       ` John W. Linville
2011-12-01 12:04               ` Yong Zhang
2011-12-01 12:42                 ` Michal Hocko
2011-12-01  2:09 ` Yong Zhang [this message]

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