linux-kernel - Re: WARNING in sysfs_remove

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Message-ID: <20171027084337.GA25695@kroah.com>
Date:   Fri, 27 Oct 2017 10:43:37 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     syzbot 
        <bot+9f03168400f56df89dbc6f1751f4458fe739ff29@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in sysfs_remove_group

On Fri, Oct 27, 2017 at 01:29:31AM -0700, syzbot wrote:
> Hello,
> 
> syzkaller hit the following crash on
> 4ed590271a65b0fbe3eb1cf828ad5af16603c8ce
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> 
> 
> 
> 
> sysfs group 'loop' not found for kobject 'loop1'
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 21947 at fs/sysfs/group.c:237
> sysfs_remove_group+0x156/0x1a0 fs/sysfs/group.c:235
> Kernel panic - not syncing: panic_on_warn set ...

It's a warning that someone did something wrong with their code, any
hint as to how you are triggering this?

thanks,

greg k-h