From: Tejun Heo <tj@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Zefan Li <lizefan@huawei.com>,
syzbot <syzbot+87b93137e0280beaeba1@syzkaller.appspotmail.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: Re: WARNING: lock held when returning to user space in grab_super
Date: Wed, 2 Jan 2019 08:16:40 -0800 [thread overview]
Message-ID: <20190102161640.GS2509588@devbig004.ftw2.facebook.com> (raw)
In-Reply-To: <a6e8d929-3765-ad70-0f7c-942b68d7b25c@I-love.SAKURA.ne.jp>
Happy new year, Tetsuo.
On Wed, Jan 02, 2019 at 09:08:56PM +0900, Tetsuo Handa wrote:
> According to commit 633feee310de6b6c ("cgroup: refactor mount path and
> clearly distinguish v1 and v2 paths"), cgroup_do_mount() is failing to
> do full teardown steps for kernfs_mount() (deactivate_locked_super() ?)
> when kernfs_node_dentry() failed.
Hmm... that's basically dget()'ing the root dentry of the sb. I'm not
sure how that could fail. Can it?
Thanks.
--
tejun
next prev parent reply other threads:[~2019-01-02 16:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-02 12:06 WARNING: lock held when returning to user space in grab_super syzbot
2019-01-02 12:08 ` Tetsuo Handa
2019-01-02 16:16 ` Tejun Heo [this message]
2019-01-02 16:49 ` Tetsuo Handa
2019-01-02 16:55 ` Tejun Heo
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