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: <2B18E8E1DDAE074A82D1060396451DAE263CCAD6@CNMAILEX04.lenovo.com>
Date:   Thu, 29 Jun 2017 03:06:19 +0000
From:   Feng Feng24 Liu <liufeng24@...ovo.com>
To:     Julia Cartwright <julia@...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

Thanks Julia, I will try it

Thanks
Feng

>-----Original Message-----
>From: Julia Cartwright [mailto:julia@...com]
>Sent: Tuesday, June 27, 2017 10:28 PM
>To: Feng Feng24 Liu
>Cc: Sebastian Andrzej Siewior; Steven Rostedt; Mike Galbraith;
>linux-kernel@...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