Bug#864453: fanotify07 LTP testcase hangs process

[Helge Deller <deller@gmx.de>]

Package: linux
Version: 4.9.30

The LTP testcase fanotify07 creates hanging processes
with debian kernel 4.9.30 on the hppa platform.

In the source code of LTP's fanotify07.c testcase one can read:
 * Kernel crashes should be fixed by:
 *  96d41019e3ac "fanotify: fix list corruption in fanotify_get_response()"
 *
 * Kernel hangs should be fixed by:
 *  05f0e38724e8 "fanotify: Release SRCU lock when waiting for userspace response"

It seems upstream commit 
05f0e38724e8 "fanotify: Release SRCU lock when waiting for userspace response"
is missing in stable kernel 4.9.30 (and debian kernel), which explains why the
testcase hangs.
I didn't checked if the kernel crash fix is in 4.9.30.

Can you backport at least the commit 05f0e38724e8 ?

Thanks,
Helge