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Re: What's going on with dm-crypt?!




Celejar wrote: 
> Hi,
> 
> I have / on a luks volume, mounted with dm-crypt (automatically,
> via /etc/fstab - /etc/crypttab). As recently as kernel 4.18.0-3,
> everything was normal. With 4.19.0-1-amd64, the volume mounts, and the
> system seems basically functional - but /dev/mapper is empty besides for
> 'control'!
> 
> ~# ls -al /dev/mapper/
> total 0
> drwxr-xr-x  2 root root      60 Dec 23 23:32 .
> drwxr-xr-x 18 root root    3340 Dec 23 23:32 ..
> crw-------  1 root root 10, 236 Dec 23 23:32 control
> 
> Despite the fact that 'mount' shows that the dm-crypt mount is present:
> 
> ~# mount | grep sda
> /dev/mapper/sda2_crypt on / type ext4 (rw,relatime,errors=remount-ro)
> /dev/sda1 on /boot type ext4 (rw,relatime)
> 
> ~#
> 
> This situation causes update-initramfs to fail:
> 
> ~# update-initramfs -u
> update-initramfs: Generating /boot/initrd.img-4.19.0-1-amd64
> mkinitramfs: failed to determine device for /
> mkinitramfs: workaround is MODULES=most, check:
> grep -r MODULES /etc/initramfs-tools
> 
> Error please report bug on initramfs-tools
> Include the output of 'mount' and 'cat /proc/mounts'
> update-initramfs: failed for /boot/initrd.img-4.19.0-1-amd64 with 1.
> 
> ~#
> 
> Which is causing things like updating kernels to fail ...
> 
> What on earth is going on here?

This might be the kernel bug introduced in 4.18:

https://lkml.org/lkml/2018/12/22/153

which will be fixed. Check the thread.

In the meantime, go back to an earlier kernel.

-dsr-