if devtmpfs unavailable, system will probably fail to boot.

[James Hunt]

/usr/share/initramfs-tools/init does this:

if ! mount -t devtmpfs -o mode=0755 udev /dev; then
    echo "W: devtmpfs not available, falling back to tmpfs for /dev"
    mount -t tmpfs -o mode=0755 udev /dev
    ...

fi

Later, /usr/share/initramfs-tools/scripts/init-bottom/udev does this:

mount -n -o move /dev ${rootmnt}/dev

However, if devtmpfs is unavailable and /dev is mounted with tmpfs, attempting to move it to the real root device will fail with:

mount: /dev is not a block device

This will likely cause the boot to fail since /dev being unavailable is bad....

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: initramfs-tools 0.99ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: i386
Date: Fri Oct 7 15:14:37 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: initramfs-tools
UpgradeStatus: Upgraded to oneiric on 2011-09-25 (12 days ago)

[dino99 (9d9)]

This version has expired