udevstart is a symlink to /sbin/udev. udev requires input arguments. real_root is not found, due to a bare /dev. system cannot boot. Reproducible: Always Steps to Reproduce: 1. run genkernel 2. verify /boot/grub/grub.conf 3. reboot Actual Results: mounting filesystems determining root device block device /dev/hda6 is not a valid root device... the root block device is unspecified or not detected please specify a device to boot, or "shell for a shell... boot() :: Expected Results: boot to a login prompt http://forums.gentoo.org/viewtopic-p-2630180.html#2630180 demonstrates a partial fix, implemented by thugging udev test.block and implanting it in (more or less) genkernel/generic/initrd.scripts. I hasten to add that I'm still a n00b, and I don't think this is the final form of the fix by any means. Props to the genkernel developers. Quite an educational chase. Portage 2.0.51.22-r2 (default-linux/x86/2005.0, gcc-3.3.5, glibc-2.3.5-r1, 2.6.12-gentoo-r6 i686) ================================================================= System uname: 2.6.12-gentoo-r6 i686 Intel(R) Pentium(R) M processor 2.00GHz Gentoo Base System version 1.6.13 dev-lang/python: 2.3.5, 2.4.1-r1 sys-apps/sandbox: 1.2.11 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6 sys-devel/binutils: 2.16.1 sys-devel/libtool: 1.5.18-r1 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium4 -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/splash /etc/terminfo /etc/texmf/web2c /etc/env.d" CXXFLAGS="-O2 -march=pentium4 -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/Linux/distributions/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="x86 X alsa apm arts avi berkdb bitmap-fonts cdr crypt cups curl eds emboss encode esd fam flac foomaticdb fortran gd gdbm gif gnome gpm gstreamer gtk gtk2 guile imlib ipv6 jpeg kde libg++ libwww mad mikmod motif mozilla mp3 mpeg ncurses nls ogg oggvorbis opengl oss pam pdflib perl png python qt quicktime readline sdl spell sqlite ssl svga tcpd tetex tiff truetype truetype-fonts type1-fonts vorbis xine xml2 xmms xv zlib userland_GNU kernel_linux elibc_glibc" Unset: ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS, PORTDIR_OVERLAY # Genkernel Configuration File # ===========GENKERNEL BASIC CONFIGURATION============= # Run 'make menuconfig' before compiling this kernel? MENUCONFIG="yes" # Run 'make clean' before compilation? # If set to NO, implies MRPROPER WILL NOT be run # Also, if clean is NO, it won't copy over any configuration # file, it will use what's there. CLEAN="yes" # Run 'make mrproper' before configuration/compilation? MRPROPER="yes" # Copy bootsplash into the initrd image? BOOTSPLASH="yes" # Override the arch detection? # ARCH_OVERRIDE="x86" # Mount /boot automatically if it isn't mounted? MOUNTBOOT="yes" # Save the new configuration in /etc/kernels upon # successfull compilation SAVE_CONFIG="yes" # Use Color output in Genkernel? USECOLOR="yes" # Add new kernel to grub? BOOTLOADER="grub" # Clear initramfs cpio cache dir CLEAR_CPIO_CACHE="yes" # Clear build cache dir CLEAR_CACHE_DIR="yes" # =========GENKERNEL LOCATION CONFIGURATION============ # Variables: # %%ARCH%% - Final determined architecture # %%CACHE%% - Final determined cache location # Default share directory location GK_SHARE="/usr/share/genkernel" # Location of helper-scripts #GK_BIN="${GK_SHARE}/bin" GK_BIN="${GK_SHARE}" # Location of the default cache CACHE_DIR="${GK_SHARE}/pkg/%%ARCH%%" # Log output file DEBUGFILE="/var/log/genkernel.log" # Debug Level DEBUGLEVEL=10 # Default location of kernel source DEFAULT_KERNEL_SOURCE="/usr/src/linux" # Default kernel config (only use to override using %%ARCH%%/kernel-config-${VER}.${PAT} !) # DEFAULT_KERNEL_CONFIG="${GK_SHARE}/%%ARCH%%/kernel-config" # Configuration file for busybox BUSYBOX_CONFIG="${GK_SHARE}/%%ARCH%%/busy-config" # BusyBox Version BUSYBOX_VER="1.00-rt-mdstart.plasmaroo" # Busybox bin-cache location, to store pre-compiled busybox # binary is just a bzip2 busybox executable BUSYBOX_BINCACHE="%%CACHE%%/busybox-${BUSYBOX_VER}-%%ARCH%%.bz2" # Location of BusyBox source tarball BUSYBOX_SRCTAR="${GK_SHARE}/pkg/busybox-${BUSYBOX_VER}.tar.bz2" # Directory created after busybox tarball is extracted BUSYBOX_DIR="busybox-${BUSYBOX_VER}" MODULE_INIT_TOOLS_VER="3.2-pre7" MODULE_INIT_TOOLS_SRCTAR="${GK_SHARE}/pkg/module-init-tools-${MODULE_INIT_TOOLS_VER}.tar.bz2" MODULE_INIT_TOOLS_DIR="module-init-tools-${MODULE_INIT_TOOLS_VER}" MODULE_INIT_TOOLS_BINCACHE="%%CACHE%%/insmod-%%ARCH%%-static-2.6.bz2" MODUTILS_VER="2.4.26" MODUTILS_SRCTAR="${GK_SHARE}/pkg/modutils-${MODUTILS_VER}.tar.bz2" MODUTILS_DIR="modutils-${MODUTILS_VER}" MODUTILS_BINCACHE="%%CACHE%%/insmod-%%ARCH%%-static-2.4.bz2" DIETLIBC_VER="0.27" DIETLIBC_SRCTAR="${GK_SHARE}/pkg/dietlibc-${DIETLIBC_VER}.tar.bz2" DIETLIBC_DIR="dietlibc-${DIETLIBC_VER}" DIETLIBC_BINCACHE="%%CACHE%%/dietlibc-${DIETLIBC_VER}-%%ARCH%%.tar.bz2" DIETLIBC_BINCACHE_TEMP="%%CACHE%%/dietlibc-${DIETLIBC_VER}-%%ARCH%%-tempdir" DEVFSD_VER="1.3.25-dietlibc-kernel25" DEVFSD_SRCTAR="${GK_SHARE}/pkg/devfsd-${DEVFSD_VER}.tar.bz2" DEVFSD_DIR="devfsd" DEVFSD_BINCACHE="%%CACHE%%/devfsd-${DEVFSD_VER}-%%ARCH%%.bz2" DEVFSD_CONF_BINCACHE="%%CACHE%%/devfsd-conf-${DIETLIBC_VER}-%%ARCH%%.bz2" UDEV_VER="065" UDEV_DIR="udev-${UDEV_VER}" UDEV_SRCTAR="${GK_SHARE}/pkg/udev-${UDEV_VER}.tar.bz2" UDEV_BINCACHE="%%CACHE%%/udev-${UDEV_VER}-%%ARCH%%.tar.bz2" DEVICE_MAPPER_VER="1.00.17" DEVICE_MAPPER_DIR="device-mapper.${DEVICE_MAPPER_VER}" DEVICE_MAPPER_SRCTAR="${GK_SHARE}/pkg/device-mapper.${DEVICE_MAPPER_VER}.tgz" DEVICE_MAPPER_BINCACHE="%%CACHE%%/device-mapper-${DEVICE_MAPPER_VER}-%%ARCH%%.tar.bz2" LVM2_VER="2.00.25" LVM2_DIR="LVM2.${LVM2_VER}" LVM2_SRCTAR="${GK_SHARE}/pkg/LVM2.${LVM2_VER}.tgz" LVM2_BINCACHE="%%CACHE%%/LVM2.${LVM2_VER}-%%ARCH%%.tar.bz2" DMRAID_VER="1.0.0.rc8" DMRAID_DIR="dmraid/${DMRAID_VER}" DMRAID_SRCTAR="${GK_SHARE}/pkg/dmraid-${DMRAID_VER}.tar.bz2" DMRAID_BINCACHE="%%CACHE%%/dmraid-${DMRAID_VER}-%%ARCH%%.tar.bz2" UNIONFS_VER="1.0.12a" UNIONFS_DIR="unionfs-${UNIONFS_VER}" UNIONFS_SRCTAR="${GK_SHARE}/pkg/unionfs-${UNIONFS_VER}.tar.gz" UNIONFS_BINCACHE="%%CACHE%%/unionfs-${UNIONFS_VER}-tools-%%ARCH%%.tar.bz2" UNIONFS_MODULES_BINCACHE="%%CACHE%%/unionfs-${UNIONFS_VER}-modules-%%KV%%-%%ARCH%%.tar.bz2" E2FSPROGS_VER="1.38" E2FSPROGS_DIR="e2fsprogs-${E2FSPROGS_VER}" E2FSPROGS_SRCTAR="${GK_SHARE}/pkg/e2fsprogs-${E2FSPROGS_VER}.tar.gz" BLKID_BINCACHE="%%CACHE%%/blkid-${E2FSPROGS_VER}-%%ARCH%%.bz2"
what options did you give when you compiled the kernel/initramfs with genkernel? please post the contents of your grub.conf also post the contents of /var/log/genkernel.log The fix you mentioned runs udevstart always and isnt really a fix. Most likely its a boot parameter out of whack on your system.
Created attachment 65303 [details] Genkernel log bzip2'd due to high output setting.
(In reply to comment #1) > what options did you give when you compiled the kernel/initramfs with > genkernel? genkernel all, based on genkernel --help. in particular, I didn't say --no-devfs. > please post the contents of your grub.conf > localhost smitty # cat /boot/grub/grub.conf default 0 timeout 30 slashimage=(hd0,2)/grub/splash.xpm.gz title=Gentoo Linux (2.6.12-gentoo-r7) root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r7 novdevfs udev devfs=nomount vga=6 splash=verbose root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda6 initrd /initramfs-genkernel-x86-2.6.12-gentoo-r7 boot title=Gentoo Linux (2.6.12-gentoo-r6) root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r6 novdevfs udev devfs=nomount vga=6 splash=verbose root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda6 initrd /initrd-2.6.12-gentoo boot title=Gentoo Linux 2.6.12-r4 root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r4 novdevfs udev devfs=nomount vga=6 splash=verbose root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda6 initrd /initrd-2.6.12-gentoo boot title=MicroSchrott LoseXP rootnoverify (hd0,0) makeactive chainloader +1 > also post the contents of /var/log/genkernel.log > bzipped and attached, due to size. > The fix you mentioned runs udevstart always and isnt really a fix. Most likely > its a boot parameter out of whack on your system. > Very possible. However, in the absence of explicitely invoking udevstart against /sys, I don't see how I'm getting a /dev entry to support real_root. The udev/sysfs code in genkernel is a little baroque. Is there a plan to purge the devfs stuff at kernel 2.6.13?
This is wrong. title=Gentoo Linux (2.6.12-gentoo-r7) root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r7 novdevfs udev devfs=nomount vga=6 splash=verbose root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda6 initrd /initramfs-genkernel-x86-2.6.12-gentoo-r7 boot it should look more like this title=Gentoo Linux (2.6.12-gentoo-r7) root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r7 nodevfs udev root=/dev/ram0 init=/linuxrc real_root=/dev/hda6 initrd /initramfs-genkernel-x86-2.6.12-gentoo-r7 Note I have removed the graphics lines from your grub entry as they are wrong for an initramfs. That is for bootsplash support, for a 2.6 kernel you want gensplash instead. refer to the documentation on how to set that up after we get this solved. The main issue you had in this is that you had typoed nodevfs and had it as novdevfs. For this reason it was trying to use devfs on your system even though its not compiled in to the initramfs. You also do not need the extra boot work at the end of the initrd line.
(In reply to comment #4) OK. I cut out the -r7 section of /boot/grub/grub.conf I did: emerge --sync emerge -C genkernel rm -rf /usr/share/genkernel emerge genkernel following ls /usr/share/genkernel/pkg I did cp /usr/portage/distfiles/module-init-tools-3.2-pre7.tar.bz2 /usr/share/genkernel/pkg cp /usr/portage/distfiles/udev-065.tar.bz2 /usr/share/genkernel/pkg having noted /usr/share/genkernel/pkg/udev-054.tar.bz2 (?) I then opened /etc/genkernel.conf After running, here is my /boot/grub/grub.conf: ...header elided... title=Gentoo Linux (2.6.12-gentoo-r7) root=(hd0,2) kernel /kernel-genkernel-x86-2.6.12-gentoo-r7 novdevfs udev devfs=nomount vga=6 splash=verbose root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda6 initrd /initramfs-genkernel-x86-2.6.12-gentoo-r7boot ...rest elided... So, there is the novdevfs typo, and a need for \n before boot in the last line. Mini-bugs in genkernel, both of these. I'm not worried about the gensplash issue at the moment. After amending these grub.conf issues, I reboot: mounting filesystems determining root device block device /dev/hda6 is not a valid root device... the root block device is unspecified or not detected please specify a device to boot, or "shell for a shell... boot() :: Now, let me explain why this is no shocker. -------- /usr/share/genkernel/generic/linuxrc has: # Set up symlinks if [ "$0" = '/init' ] then /bin/busybox --install -s [ -e /linuxrc ] && rm /linuxrc [ -e /sbin/udev ] && ln -s /sbin/udev /sbin/udevstart if [ -e /bin/lvm ] then ln -s /bin/lvm /bin/vgscan ln -s /bin/lvm /bin/vgchange fi fi # Mount sysfs mount_sysfs # Start udev/devfs start_dev_mgr Let's trace that. -------- /usr/share/genkernel/generic/initrd.scripts mount_sysfs(){ if [ "${KV_2_6_OR_GREATER}" ] then # Udev is semi-broken on non /sys sysfs mount points. mount -t sysfs /sys /sys >/dev/null 2>&1 ret=$? # sysfs mount failed .. udev wont work fall back to devfs if available [ "$ret" -eq '0' ] || USE_UDEV_NORMAL=0 fi } start_dev_mgr(){ # Check udev is available... if [ "${KV_2_6_OR_GREATER}" -a ! "${USE_UDEV_NORMAL}" -eq '0' -a -x /sbin/udev ] then USE_UDEV_NORMAL=1 else USE_UDEV_NORMAL=0 fi if [ "${USE_UDEV_NORMAL}" -eq '1' ] then cd /sys [ "${DO_bladecenter}" ] && sleep 10 kill_devfsd good_msg 'Activating udev' runUdev [ "${DO_bladecenter}" ] && sleep 20 cd / else if [ ! -e /dev/.devfsd ] then good_msg 'Activating devfs' mount -t devfs devfs /dev devfsd /dev -np fi fi } runUdev() { mount -t tmpfs -o size=100k udev /dev mkdir /dev/pts mkdir /dev/shm /sbin/udevstart ln -snf /proc/self/fd /dev/fd ln -snf /proc/self/fd/0 /dev/stdin ln -snf /proc/self/fd/1 /dev/stdout ln -snf /proc/self/fd/2 /dev/stderr ln -snf /proc/kcore /dev/core } As we saw in linuxrc, /sbin/udevstart is just an alias for udev. What is a 0-argument call going to effect in udev.c? (I've added whitespace for personal clarity): /* trigger timeout to prevent hanging processes */ alarm( UDEV_ALARM_TIMEOUT ); action = getenv( "ACTION" ); devpath = getenv( "DEVPATH" ); subsystem = getenv( "SUBSYSTEM" ); /* older kernels passed the SUBSYSTEM only as argument */ if (!subsystem && argc == 2) subsystem = argv[1]; if (!action || !subsystem || !devpath) { err("action, subsystem or devpath missing"); goto exit; } Thus, if we don't do something along the lines of splicing in udev-065/test/test.all, to put a few device paddles in /dev for us, we will find ourselves empty handed, and up the scatalogical waterway. Unless I've missed something. Best, Chris
Not a bug as such; note that genkernel uses *054* which treats argv[0] differently. The reason the forums guy is getting the issue is that he probably needs to empty out /usr/share/genkernel/pkg/x86 and then rebuild. However, we do need to fix this since an upgrade to a newer udev is required for HPPA.
(In reply to comment #6) > Not a bug as such; note that genkernel uses *054* which treats argv[0] > differently. The reason the forums guy is getting the issue is that he probably > needs to empty out /usr/share/genkernel/pkg/x86 and then rebuild. However, we do > need to fix this since an upgrade to a newer udev is required for HPPA. Fair enough. While I have about two weeks of madness facing me at work, I'd like to think out loud about the possibility of contributing a patch to genkernel. Thoughts include: - fixing the two grub.conf buglets noted in post #4 - purging devfs entirely (as it's scheduled for extinction in linux-2.6.13) I don't pretend to know everything necessary to get it right immediately, but I feel I'm making progress. Eventual goal is to become a respectable kernel hacker. Contributing to genkernel seems a splendid learning opportunity. Getting a n00b up to speed is non-trivial; I understand in advance if the answer is "thanks, but..." Best, Chris
Any code that removes devfs will not be accepted at this time. We still need to support 2.4 kernels and devfs is required for those. We also have a patch that needs to be tested for newer udev support. udevstart was split off from udev in future versions so we needed to take that change into account.
(In reply to comment #8) > Any code that removes devfs will not be accepted at this time. We still need > to support 2.4 kernels and devfs is required for those. > We also have a patch that needs to be tested for newer udev support. udevstart > was split off from udev in future versions so we needed to take that change > into account. Fair enough. What about a linuxrc command line interface replacing: nodevfs udev devfs=nomount with dev=x where x = devfs or udev? Argument being that 1 is better than 3 for command line parameters. Best, Chris
Newer udev support is in cvs.
genkernel 3.3.6 is now in CVS
...forgot to resolve the bug... heh
