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

[Stefan Bader]

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?

-Stefan

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