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

[Christian Brauner]

On Mon, Aug 24, 2020 at 04:29:06AM +0100, 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?

Thanks James. I haven't forgotten. I simply didn't have time to look
into it yet. I'm look a now but I'll likely need another week because of
Plumbers. Sorry for the delay.

Christian