linux-kernel - Re: BUG: NULL pointer dereference in shmem_evict

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Message-ID: <5032E940.3020801@us.ibm.com>
Date:	Mon, 20 Aug 2012 18:49:52 -0700
From:	John Stultz <johnstul@...ibm.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel@...r.kernel.org
Subject: Re: BUG: NULL pointer dereference in shmem_evict_inode()

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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