Message-ID: <5032E940.3020801@us.ibm.com>
Date: Mon, 20 Aug 2012 18:49:52 -0700
From: John Stultz <johnstul@us.ibm.com>
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To: Fengguang Wu <fengguang.wu@intel.com>
CC: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Richard Cochran <richardcochran@gmail.com>,
        Prarit Bhargava <prarit@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, linux-fsdevel@vger.kernel.org
Subject: Re: BUG: NULL pointer dereference in shmem_evict_inode()
References: <20120821010403.GA12018@localhost> <5032E021.2030400@linaro.org> <5032E114.30503@us.ibm.com> <20120821014027.GA12316@localhost>
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On 08/20/2012 06:40 PM, Fengguang Wu wrote:
> On Mon, Aug 20, 2012 at 06:15:00PM -0700, John Stultz wrote:
>> On 08/20/2012 06:10 PM, John Stultz wrote:
>>> On 08/20/2012 06:04 PM, Fengguang Wu wrote:
>>>> Hi John,
>>>>
>>>> The below oops happens in v3.5..v3.6-rc2 and it's bisected down
>>>> to commit
>>>> 2a8c0883c ("time: Move xtime_nsec adjustment underflow handling
>>>> timekeeping_adjust").
>>>>
>>>> However linux-next is working fine. Do you have any fixes not
>>>> yet sent to Linus?
>>> Yea, there's a fix pending in tip/timers/urgent
>>> (4e8b14526ca7fb046a81c94002c1c43b6fdf0e9b) to catch crazy values
>> >from settimeofday or the cmos clock that might overflow a ktime_t.
>>> Out of curiosity, how are you triggering/reproducing this?
>>>
>> Looking at the commit you pointed out, it seems more likely Ingo's
>> fix (1d17d17484d40f2d5b35c79518597a2b25296996) might be related, but
>> that should have landed in v3.6-rc2.  So I'm not sure.
> Ah ok, looking back into the logs, I didn't find v3.6-rc2 being
> tested. Sorry I should have confused it with another bug.
>
> I'll test v3.6-rc2.
Ok. If v3.6-rc2 doesn't show the problem that would make me feel a bit 
better that Ingo's fix is the one that is resolving this for you.

thanks again!
-john


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