Comment 2 for bug 1852518

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Michael Hudson-Doyle (mwhudson) wrote :

I managed to reproduce this in a xenial vm on my machine. The problem appears with udev 243 it seems (installing udev and libudev 242-7ubuntu3 makes it work again).

When kpartx works it prints this message:

root@c:~# kpartx -av image.img
/dev/mapper/loop0p1 not set up by udev: Falling back to direct node creation.
add map loop0p1 (252:0): 0 2088960 linear 7:0 4096

so for some reason it's not getting to that fallback. FWIW, that fallback code is in libdevmapper (src:lvm2).