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

[James Troup]

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?

-- 
James