Using the output of /bin/mount to find the root partition gives me nonsense: $ mount |grep sda /dev/sda7 on / type ext4 (rw,relatime,data=ordered) /dev/sda3 on /media/debian type ext4 (rw,relatime,data=ordered) /dev/sda8 on /common type ext4 (rw,relatime,data=ordered) --- The first root=/dev/sda occurence given at /usr/src/.config hardcoded is root=/dev/sda7 , the second given from gummiboot (efi grub like starter) in cmdline is: $ cat /proc/cmdline rootfstype=ext4 init=/sbin/systemd root=/dev/sda7 net.ifnames=0 systemd.unit=default.target init=/sbin/systemd root=/dev/sda4 rootfstype=ext4 net.ifnames=0 quiet systemd.show_status=1 systemd.log_level=3 acpi_backlight=vendor acpi_osi=Linux --- My /etc/mtab is a link to ../proc/self/mounts on a systemd # cat /etc/mtab rootfs / rootfs rw 0 0 --- $ mountpoint -d / 8:4 --- which is actual root=/dev/sda4
1 ) Please post your `emerge --info' output in a comment. 2 ) Please describe exactly: 2a) what mount output /should/ look like and 2b) what mount output /does/ look like.
It looks like it finds the root partition: $ mount /dev/sda7 on / type ext4 (rw,relatime,data=ordered) devtmpfs on /dev type devtmpfs (rw,relatime,size=1886824k,nr_inodes=471706,mode=755) sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/f... ---- But it just out puts the first of /proc/cmdline root= occurence. This is an upstream bug. This phenomenon shows up also using Debian-unstable. mount should do something I found googling: # cat /usr/local/bin/myroot #!/bin/bash R=$(stat -c '%04D' / ) for f in $(find /dev -type b 2>/dev/null) ; do C=$(stat -c '%02t%02T' $f ) [ "$C" = "$R" ] && ROOTDEVICE="$f" && break done echo $ROOTDEVICE --- which exactly shows the root partition. Even a chroot partition.
(In reply to Jeroen Roovers from comment #1) > 1 ) Please post your `emerge --info' output in a comment.
# emerge --info Portage 2.2.14 (python 3.4.2-final-0, unavailable, gcc-4.8.3, glibc-2.19-r1, 3.17-1.towo.2-siduction-amd64 x86_64) ================================================================= System uname: Linux-3.17-1.towo.2-siduction-amd64-x86_64-Intel-R-_Core-TM-2_Duo_CPU_P8700_@_2.53GHz-with-gentoo-2.2 KiB Mem: 3790692 total, 1601096 free KiB Swap: 5242876 total, 5242876 free Timestamp of tree: Mon, 27 Oct 2014 08:45:01 +0000 ld GNU ld (GNU Binutils) 2.24 app-shells/bash: 4.2_p53 dev-java/java-config: 2.2.0 dev-lang/perl: 5.18.2-r2 dev-lang/python: 2.7.8, 3.4.2 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r2 sys-apps/baselayout: 2.2 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.11.6, 1.14.1 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.8.3 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2-r1 sys-devel/make: 4.1-r1 sys-kernel/linux-headers: 3.16 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo location: /common/portdir sync-type: rsync sync-uri: rsync://rsync11.de.gentoo.org/gentoo-portage priority: 5 pmaci location: /common/pmaci masters: gentoo priority: 7 ABI="amd64" ABI_X86="32 64" ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA Broadcom google-chrome FraunhoferFDK googleearth NVIDIA-CUDA" ACCEPT_PROPERTIES="*" ACCEPT_RESTRICT="*" ALSA_CARDS="hda-intel" ANT_HOME="/usr/share/ant" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ARCH="amd64" AUTOCLEAN="yes" BOOTSTRAP_USE="cxx unicode internal-glib python_targets_python3_3 python_targets_python2_7 multilib" CALLIGRA_FEATURES="braindump flow karbon sheets stage words krita" CBUILD="x86_64-pc-linux-gnu" CDPATH=".:/common:/portable:" CFLAGS=" -march=native -O3 " CFLAGS_amd64="-m64" CFLAGS_x32="-mx32" CFLAGS_x86="-m32" CHOST="x86_64-pc-linux-gnu" CHOST_amd64="x86_64-pc-linux-gnu" CHOST_x32="x86_64-pc-linux-gnux32" CHOST_x86="i686-pc-linux-gnu" CLEAN_DELAY="5" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" COLLISION_IGNORE="/lib/modules/* *.py[co] *$py.class */dropin.cache" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0 /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS=" -march=native -O3 " DEFAULT_ABI="amd64" DISPLAY=":0" DISTDIR="/common/distfiles" DRACUT_MODULES="crypt systemd dmsquash-live" DVB_CARDS="af9005 bcm3510 cx18 cx231xx cx23885 dibusb-usb2 mpc718 nxt200x opera1 or51132 or51211 pvrusb2 sp8870 sp887x tda10045 tda10046 tda10046lifeview ttpci ttusb-dec usb-a800 usb-af9015 usb-bluebird usb-dib0700 usb-dtt200u usb-dw2104 usb-umt usb-vp702x usb-vp7045 usb-wt220u vp7041" EDITOR="/bin/nano" ELIBC="glibc" EMERGE_DEFAULT_OPTS=" --quiet-build=y --binpkg-respect-use=y --with-bdeps=y --verbose-conflicts --verbose --color=y --alphabetical --ask-enter-invalid --jobs=1 --ask=y --nospinner" EMERGE_WARNING_DELAY="10" ENLIGHTENMENT_MODULES="clock comp conf-applications conf-dialogs conf-edgebindings conf-interaction conf-intl conf-keybindings conf-menus conf-paths conf-performance conf-shelves conf-theme conf-window-manipulation conf-window-remembers cpufreq dropshadow everything fileman fileman-opinfo gadman ibar ibox illume2 mixer msgbus notification pager quickaccess start syscon systray tasks temperature tiling winlist wizard" EPREFIX="" EROOT="/" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildpkg clean-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms split-log strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync webrsync-gpg xattr" FETCHCOMMAND="wget -t 3 -T 60 --passive-ftp -O "${DISTDIR}/${FILE}" "${URI}"" FETCHCOMMAND_RSYNC="rsync -avP "${URI}" "${DISTDIR}/${FILE}"" FETCHCOMMAND_SFTP="bash -c "x=\${2#sftp://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; eval \"declare -a ssh_opts=(\${3})\" ; exec sftp -P \${port} \"\${ssh_opts[@]}\" \"\${host}:/\${x#*/}\" \"\$1\"" sftp "${DISTDIR}/${FILE}" "${URI}" "${PORTAGE_SSH_OPTS}"" FETCHCOMMAND_SSH="bash -c "x=\${2#ssh://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec rsync --rsh=\"ssh -p\${port} \${3}\" -avP \"\${host}:/\${x#*/}\" \"\$1\"" rsync "${DISTDIR}/${FILE}" "${URI}" "${PORTAGE_SSH_OPTS}"" FFLAGS="-O2 -pipe" GCC_SPECS="" GENTOO_MIRRORS="http://distfiles.gentoo.org"
what does `cat /proc/self/mountinfo` show ? post the output of `ls -l /dev/sda*` run this command and attach the log file: strace -v -o log mountpoint -d /
# cat /proc/self/mountinfo 13 0 8:4 / / rw,relatime shared:1 - ext4 /dev/root rw,data=ordered 14 13 0:5 / /dev rw,relatime shared:2 - devtmpfs devtmpfs rw,size=1886824k,nr_inodes=471706,mode=755 15 13 0:13 / /sys rw,nosuid,nodev,noexec,relatime shared:5 - sysfs sysfs rw 16 13 0:3 / /proc rw,nosuid,nodev,noexec,relatime shared:11 - proc proc rw 17 15 0:14 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:6 - securityfs securityfs rw 18 14 0:15 / /dev/shm rw,nosuid,nodev shared:3 - tmpfs tmpfs rw 19 14 0:10 / /dev/pts rw,nosuid,noexec,relatime shared:4 - devpts devpts rw,gid=5,mode=620,ptmxmode=000 20 13 0:16 / /run rw,nosuid,nodev shared:12 - tmpfs tmpfs rw,mode=755 21 15 0:17 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:7 - tmpfs tmpfs ro,mode=755 22 21 0:18 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:8 - cgroup cgroup rw,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 23 15 0:19 / /sys/fs/pstore ro,nosuid,nodev,noexec,relatime shared:9 - pstore pstore ro 24 15 0:20 / /sys/firmware/efi/efivars rw,nosuid,nodev,noexec,relatime shared:10 - efivarfs efivarfs rw 25 21 0:21 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,cpuset 26 21 0:22 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,memory 27 21 0:23 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,devices 28 21 0:24 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,freezer 29 21 0:25 / /sys/fs/cgroup/net_cls rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,net_cls 30 21 0:26 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,blkio 31 21 0:27 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,perf_event 32 16 0:28 / /proc/sys/fs/binfmt_misc rw,relatime shared:20 - autofs systemd-1 rw,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 33 14 0:29 / /dev/hugepages rw,relatime shared:21 - hugetlbfs hugetlbfs rw 34 14 0:12 / /dev/mqueue --- # mount /dev/sda7 on / type ext4 (rw,relatime,data=ordered) devtmpfs on /dev type devtmpfs (rw,relatime,size=1886824k,nr_inodes=471706,mode=755) sysfs on /sys type sysfs ... --- my script of above found googling outputs: # myroot /dev/sda4 --- You are likely to reproduce the bug, if you put via grub command 'e' in your cmdline something like in this specific order: root=/dev/sdaY root=/dev/sdaN where Y is a wrong phantasie number and N is your real root.
do you have a /dev/root symlink ? run `strace -o log -s 4096 -v mount` and attach the log file here
$ vdir /dev/roo* Press any key to continue.. --- nothing.
(In reply to Ulenrich from comment #8) you really should post all the commands requested and not just the first one
Created attachment 387704 [details] strace-output.log Can you reproduce the but by adding to the cmdline from grub?
I just saw: http://thread.gmane.org/gmane.linux.utilities.util-linux-ng/10110 that patch of Mike Frysinger applying works for me: # mount /dev/sda4 on / type ext4 (rw,relatime,data=ordered) devtmpfs on /dev type devtmpfs (rw,rel .... --- As I understand the patch it looks at the last occurence of root=xxx in /proc/cmdline as like the kernel does to take the desired root partition. (What if we are in a chroot?)
That is cool: The patch works when I chrooted from Debian sda3 to Gentoo sda4: # mount /dev/sda4 on / type ext4 (rw,relatime,data=ordered) ---
upstream has merged my patch. next time there's a rev/ver bump i'll include it, but otherwise i don't plan on adding one specifically for this. the impact is pretty low and trivial to work around.
fix is in 2.26 which is in the tree now
