On Mon, Aug 08, 2016 at 10:08:06PM -0400, jeffm@suse.com wrote:

From: Jeff Mahoney <redacted>

We wait on qgroup rescan completion in three places: file system
shutdown, the quota disable ioctl, and the rescan wait ioctl.  If the
user sends a signal while we're waiting, we continue happily along.  This
is expected behavior for the rescan wait ioctl.  It's racy in the shutdown
path but mostly works due to other unrelated synchronization points.
In the quota disable path, it Oopses the kernel pretty much immediately.

Cc: <redacted> # v4.4+
Signed-off-by: Jeff Mahoney <redacted>

Reviewed-by: David Sterba <dsterba@suse.com>