linux-kernel - Re: fs_context-related oops in mainline

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Date:   Fri, 15 Mar 2019 12:50:02 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     David Howells <dhowells@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        fenghua.yu@...el.com, linux-kernel@...r.kernel.org
Subject: Re: fs_context-related oops in mainline

On Fri, Mar 15, 2019 at 11:44:45AM +0000, David Howells wrote:
> Dominik Brodowski <linux@...inikbrodowski.net> wrote:
> 
> > [    0.839322] RIP: 0010:sysfs_init_fs_context+0x82/0xd0
> 
> Could you load your kernel into gdb and then do:
> 
> 	i li *sysfs_init_fs_context+0x82

Doesn't seem necessary as per my mail to Al a few seconds ago:
kobj_ns_grab_current(KOBJ_NS_TYPE_NET) returns NULL, so

        fc->user_ns = get_user_ns(netns->user_ns);

will try to dereference a null pointer.

Thanks,
	Dominik