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

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Date:	Mon, 20 Aug 2012 18:10:57 -0700
From:	John Stultz <john.stultz@...aro.org>
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 06:04 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?

thanks
-john

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