linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

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Message-ID: <20170627142757.GA1463@jcartwri.amer.corp.natinst.com>
Date:   Tue, 27 Jun 2017 09:27:57 -0500
From:   Julia Cartwright <julia@...com>
To:     Feng Feng24 Liu <liufeng24@...ovo.com>
CC:     Sebastian Andrzej Siewior <sebastian.siewior@...utronix.de>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        Mike Galbraith <efault@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at
 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

On Tue, Jun 27, 2017 at 05:47:41AM +0000, Feng Feng24 Liu wrote:
> Hi, Julia
> 	Thanks for your kindly hit. I will try this patch
> 	The problem is accidental. I will try to reproduce it.
> 	BTW, could you help to give the link about the emails which
> 	discuss about " nsfs: mark dentry with DCACHE_RCUACCESS ". I
> 	cannot find them(just patch email)

Conversation upstream started with a syzkaller-found problem here:

   https://marc.info/?l=linux-netdev&m=149183505630266&w=2

Hopefully that helps,
   Julia

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