[cip-dev] Reviewing 4.4 stable updates

[daniel.sangorrin@toshiba.co.jp (Daniel Sangorrin)]

It seems that backporting "fanotify: Release SRCU lock when waiting for userspace response" was too complicated:
https://lists.debian.org/debian-kernel/2017/06/msg00170.html

> -----Original Message-----
> From: cip-dev-bounces at lists.cip-project.org
> [mailto:cip-dev-bounces at lists.cip-project.org] On Behalf Of Daniel Sangorrin
> Sent: Tuesday, May 15, 2018 1:07 PM
> To: 'Ben Hutchings' <ben.hutchings@codethink.co.uk>;
> cip-dev at lists.cip-project.org
> Subject: Re: [cip-dev] Reviewing 4.4 stable updates
> 
> > -----Original Message-----
> > From: cip-dev-bounces at lists.cip-project.org
> > [mailto:cip-dev-bounces at lists.cip-project.org] On Behalf Of Daniel Sangorrin
> > Sent: Thursday, April 26, 2018 8:53 AM
> > To: 'Ben Hutchings' <ben.hutchings@codethink.co.uk>;
> > cip-dev at lists.cip-project.org
> > Subject: Re: [cip-dev] Reviewing 4.4 stable updates
> ...
> > I saw there is already a 4.4.129 on the linux-stable-rc.git linux-4.4.y.
> > Test results so far show no regressions (altough i see failures that might need
> > investigation?):
> > Pixel: https://lkml.org/lkml/2018/4/22/732
> > Linaro: https://lkml.org/lkml/2018/4/23/116
> > Kerneltests: https://lkml.org/lkml/2018/4/23/823
> > dmseg: https://lkml.org/lkml/2018/4/23/1028
> >
> > I will run some tests with Fuego.
> 
> Sorry for the late response. I tested LTS 4.4.129 with Fuego and most tests worked
> correctly.
> There were a few errors on some of the LTP tests (see the file attached).
> 
> fcntl35.c:98: FAIL: an unprivileged user init the capacity of a pipe to 65536
> unexpectedly, expected 4096
> getxattr04.c:72: FAIL: getxattr() failed to get an existing attribute
> inotify07.c:157: FAIL: didn't get event: mask=40000004
> inotify08.c:150: FAIL: didn't get event: mask=4
> [Note] These 4 errors could be related with some configuration, so I need to
> investigate them further.
> 
> For fanotify07 and fanotify08 I got some timeout errors:
> tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Test timeouted, sending SIGKILL!
> Cannot kill test processes!
> Congratulation, likely test hit a kernel bug.
> Exitting uncleanly...
> 
> Dhinakar Kalyanasundaram mentioned that this bug was fixed in kernel 4.14, and
> Tim Bird updated the Fuego LTP documentation suggesting that backporting the
> patch "fanotify: Release SRCU lock when waiting for userspace response" should fix
> the hang.
> https://patchwork.kernel.org/patch/9659809/
> 
> Shall I backport it and test?
> 
> Thanks,
> Daniel