Control: reassign -1 dmsetup 2:1.02.133-1 On Thu, 2016-10-20 at 14:27 +0200, Cesare Leonardi wrote: > Package: initramfs-tools > Version: 0.125 > Severity: normal > > Initially i thought to file this bug to lvm2 package but now i suspect > it's more related with kernel modules dependencies and the > manual_add_modules() hook of initramfs-tools. > > Suppose your system has lvm2 installed but not mdadm. > Now search for the raid modules installed in the initramfs image: > lsinitramfs IMG | grep raid > You will notice that there are various raid modules loaded but not > raid1. > > LVM is a very flexible system that let's you convert your volume setup > from linear to raidN and viceversa, with mounted filesystem. > > So if you, for example, try to you convert your single disk volume to > a two disks raid1 volume, you will have an unbootable system, due to > failure of volume activation caused by the missing raid1 module. > > The workaround it to add "raidi1" to /etc/initramfs-tools/modules and > update the initramfs before rebooting. [...] OK, so there is a hidden module dependency: dm-raid depends on md-mod, which will request other md-RAID modules as needed. We can't discover that through static inspection of the modules or looking at sysfs. I think this ought to be handled in dmsetup's initramfs hook. Ben. -- Ben Hutchings Never put off till tomorrow what you can avoid all together.
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