Bug#858669: cp: cannot create hard link [...]: Invalid cross-device link + rm: cannot remove [...]/dev/ptmx': Device or resource busy

[Thorsten Glaser]

Michael Prokop dixit:

>I'm afraid this will affect more users with existing chroots once
>they upgrade to the pbuilder from stretch (I noticed and reproduced
>this issue on three different environments already).

This looks like something to do with those symlinks instead of
directories you have on /var/cache/pbuilder (although you state
it also happens if that's a tmpfs which wonders me) as I’m
running new pbuilder on sid with old chroots quite a lot
without such problems.

One of the issues looks like something (mount?) realpath()ising
while something else (umount?) isn’t (or the calls to them).

bye,
//mirabilos
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