NACK: [SRU][UNSTABLE/FOCAL/BIONIC][PATCH v2] UBUNTU: SAUCE: shiftfs: fix dentry revalidation

[Christian Brauner]

On Mon, Aug 24, 2020 at 09:13:11AM +0200, Stefan Bader wrote:
> On 24.08.20 05:29, James Troup wrote:
> > James Troup <james.troup at canonical.com> writes:
> > 
> >> Christian Brauner <christian.brauner at ubuntu.com> writes:
> >>
> >>> https://asciinema.org/a/334491
> >>> https://asciinema.org/a/334492
> >>
> >> Like I mentioned in the bug report, emacs is the key to reproducing it
> >> for me.  I don't know why.  But if I use vim or shell commands, I
> >> can't (reliably or easily) reproduce it either.  However, I can
> >> everytime with emacs.
> >>
> >>> What's the backing filesystem you're using, i.e. whats your host
> >>> filesystem? Any other details that might help?
> >>
> >> The host is a FDE ext4 FS (so with LVM + DM crypt).  The lxc is on
> >> zfs. Ah, and I'm using ZRAM (zram-config package is installed), I
> >> guess that could be relevant.
> > 
> > Hey, any update on this or anything I can do to help move this
> > forward?  Chris Sanders reporting seeing the same problem, so I don't
> > think it's something specific to my setup/laptop.
> > 
> > FWIW, I can also apparently reproduce it reliably with 'bzr revert',
> > so not just emacs either.  I wonder if it has to do with updating a
> > file in place vs. writing to a temporary file and rename()'ing into
> > place?
> > 
> Hi James,
> 
> were you provided with a test kernel to ensure the change solves the problem and
> does not introduce any new problematic behavior?

The change here is not relevant anymore otherwise I would've resent.
Once Plumbers is over I'll look into this again.

Thanks!
Christian