Package: debian-boot Version: 4.19.0-20-amd64 Severity: wishlist Dear Maintainer,
Please include dm-cache and possibly all dm-* modules in the rescue kernel. The lack of these modules makes the rescue process very complicated for a sytem where dm-cache was applied to an important logical volume. * What led up to the situation? We are using LVM2 and an dm-cache to speed up some of the volumes with SSD that are run on HDD-s. We had an issue where we could not boot the system, so as normally we turned to the rescue mode of the installer to reinstall the boot partition and parts of the kernel. Unfortunately the /var partition is backed up by lvm-cache and the rescue disk was not able to bring it up. * What exactly did you do (or not do) that was effective (or ineffective)? We tried several ways to load the missing modules from the installer, but were not able to find any. As a last resolt we were able to find a rescue disk matching the exact kernel version the system was on, so we could load the kernel modules from the still accessible logical volumes. * What was the outcome of this action? We were able to recover the system, but the process was much more complicated than it normally would. * What outcome did you expect instead? Because dm-cache and the relevant modules are part of the official debian kernel package (linux-image-4.19.0-20-amd64) we expected these modules readily be available for the rescue kernel as well. An alternative, but more complication solution would be if the installer would detect these types of LVs and download the driver automatically or upon request. Thank you -- System Information: Debian Release: 10.12 APT prefers oldstable-updates APT policy: (500, 'oldstable-updates'), (500, 'oldstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.19.0-20-amd64 (SMP w/8 CPU cores) Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_US.UTF-8, LC_CTYPE=hu_HU.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.utf8), LANGUAGE=en_US:en (charmap=UTF-8) (ignored: LC_ALL set to en_US.utf8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
