Re: overlayfs 4.19: unable to make backup link: Invalid cross-device link

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On Sat, Oct 27, 2018 at 10:04 PM, Theodore Y. Ts'o <tytso@xxxxxxx> wrote:
> I was rebuilding my dropbox Docker container, and it failed in 4.19
> with the following error:
>
> dpkg: error processing archive /var/cache/apt/archives/perl-base_5.20.2-3+deb8u11_amd64.deb (--unpack):
>  unable to make backup link of `./usr/bin/perl5.20.2' before installing new version: Invalid cross-device link
> dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
> dpkg: error: error creating new backup file '/var/lib/dpkg/status-old': Invalid cross-device link
> E: Sub-process /usr/bin/dpkg returned an error code (2)
>
> When I booted the 4.18.0-2 kernel from Debian, the exact same Docker
> file worked just fine.  With 4.19 it fails reliably.

Can you please post

  grep OVERLAY_FS .config

?

I'd suspect METACOPY being enabled and regressing (since it's a new feature).

Thanks,
Mikos



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