linux-kernel - Re: GPF in __mark_inode_dirty due to locked_inode_to_wb_and_lock

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Message-ID: <20160713180724.GI4065@mtj.duckdns.org>
Date:	Wed, 13 Jul 2016 14:07:24 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	Jan Kara <jack@...e.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	dvyukov@...gle.com, linux-btrfs@...r.kernel.org,
	SiteGround Operations <operations@...eground.com>
Subject: Re: GPF in __mark_inode_dirty due to
 locked_inode_to_wb_and_lock_list returning NULL

Hello,

On Mon, Jul 04, 2016 at 04:15:35PM +0300, Nikolay Borisov wrote:
> So the btrfs fs was created inside a loop device and mounted with -o loop. 
> Evidently from the oops it seems that this is the normal umount path, meaning 
> that no device hot plugging was in action. Unfortunately I don't have a reproducer. 
> However, the workload looks like the following: 
> 
> 1. mount -t btrfs -o compress=zlib -o subvol="${subvol}" -o loop "${storage_file}" "${mount_point}"
> 2. Do reads/writes (rsync) (dirtying some pages)
> 3. umount "${mount_point}"

I see.  Yeah, normal umount path does destroy the block device and can
trigger the bug.  Please ping if the issue happens again with the
patches applied.

Thanks.

-- 
tejun