This is a note to let you know that I've just added the patch titled mm balloon: umount balloon_mnt when removing vb device to the 4.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-balloon-umount-balloon_mnt-when-removing-vb-device.patch and it can be found in the queue-4.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 9c57b5808c625f4fc93da330b932647eaff321f7 Mon Sep 17 00:00:00 2001 From: Yisheng Xie <xieyisheng1@xxxxxxxxxx> Date: Fri, 24 Feb 2017 15:00:40 -0800 Subject: mm balloon: umount balloon_mnt when removing vb device From: Yisheng Xie <xieyisheng1@xxxxxxxxxx> commit 9c57b5808c625f4fc93da330b932647eaff321f7 upstream. With CONFIG_BALLOON_COMPACTION=y the kernel will mount balloon_mnt for balloon page migration when we probe a virtio_balloon device. However we do not unmount it when removing the device. Fix this. Fixes: b1123ea6d3b3 ("mm: balloon: use general non-lru movable page feature") Link: http://lkml.kernel.org/r/1486531318-35189-1-git-send-email-xieyisheng1@xxxxxxxxxx Signed-off-by: Yisheng Xie <xieyisheng1@xxxxxxxxxx> Acked-by: Minchan Kim <minchan@xxxxxxxxxx> Cc: Rafael Aquini <aquini@xxxxxxxxxx> Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx> Cc: Gioh Kim <gi-oh.kim@xxxxxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: Hanjun Guo <guohanjun@xxxxxxxxxx> Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/virtio/virtio_balloon.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -615,8 +615,12 @@ static void virtballoon_remove(struct vi cancel_work_sync(&vb->update_balloon_stats_work); remove_common(vb); +#ifdef CONFIG_BALLOON_COMPACTION if (vb->vb_dev_info.inode) iput(vb->vb_dev_info.inode); + + kern_unmount(balloon_mnt); +#endif kfree(vb); } Patches currently in stable-queue which might be from xieyisheng1@xxxxxxxxxx are queue-4.10/mm-balloon-umount-balloon_mnt-when-removing-vb-device.patch