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Bug 927458 - Strange fstab mount order effect.
Summary: Strange fstab mount order effect.
Status: RESOLVED INVALID
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal normal (vote)
Assignee: Gentoo Linux bug wranglers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2024-03-21 20:24 UTC by Jan Hrabe
Modified: 2024-03-23 19:46 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Jan Hrabe 2024-03-21 20:24:50 UTC
I have the following /etc/fstab entries, which work fine:

PARTUUID=c12a7328-f81f-11d2-ba4b-00a0c93ec93b /boot        vfat umask=0077 0 2
PARTUUID=0657fd6d-a4ab-43c4-84e5-0933c84b4f4f none         swap sw         0 0
PARTUUID=4f68bce3-e8cd-4db1-96e7-fbcaf984b709 /            ext4 defaults,noatime 0 1
PARTUUID=716bb614-cf65-fd46-8012-64377d3b231c /home/family ext4 defaults,noatime      0 2
PARTUUID=933ac7e1-2eb4-4f13-b844-0e14e2aef915 /home        ext4 defaults,noatime      0 2

When I try to swap the /home and /home/family entries to have (more logically) the /home first, the mounting breaks.  The /home/family then has only the lost+found in it.  When unmounted, the correct directories appear but the partition is no longer listed as mounted.  It thus appears that the /home/family has two entities mounted in this case, one of them empty.

---------

The output of emerge --info is as follows:

# emerge --info
Portage 3.0.61 (python 3.11.8-final-0, default/linux/amd64/17.1/desktop, gcc-13, glibc-2.38-r10, 6.6.21-gentoo x86_64)
=================================================================
System uname: Linux-6.6.21-gentoo-x86_64-12th_Gen_Intel-R-_Core-TM-_i9-12900K-with-glibc2.38
KiB Mem:   131711796 total, 108145280 free
KiB Swap:  268435452 total, 268435452 free
Timestamp of repository gentoo: Thu, 21 Mar 2024 16:00:00 +0000
Head commit of repository gentoo: 85bfc7b7bee1b28a4d7f3eb3a33e1e34337ec84a
sh bash 5.1_p16-r6
ld GNU ld (Gentoo 2.41 p5) 2.41.0
app-misc/pax-utils:        1.3.7::gentoo
app-shells/bash:           5.1_p16-r6::gentoo
dev-build/autoconf:        2.71-r6::gentoo
dev-build/automake:        1.16.5-r2::gentoo
dev-build/cmake:           3.28.3::gentoo
dev-build/libtool:         2.4.7-r2::gentoo
dev-build/make:            4.4.1-r1::gentoo
dev-build/meson:           1.3.1-r1::gentoo
dev-java/java-config:      2.3.3-r1::gentoo
dev-lang/perl:             5.38.2-r2::gentoo
dev-lang/python:           3.11.8_p1::gentoo, 3.12.2_p1::gentoo
dev-lang/rust-bin:         1.74.1::gentoo
sys-apps/baselayout:       2.14-r2::gentoo
sys-apps/openrc:           0.53::gentoo
sys-apps/sandbox:          2.38::gentoo
sys-devel/binutils:        2.41-r5::gentoo
sys-devel/binutils-config: 5.5::gentoo
sys-devel/clang:           17.0.6::gentoo
sys-devel/gcc:             13.2.1_p20240210::gentoo
sys-devel/gcc-config:      2.11::gentoo
sys-devel/llvm:            17.0.6::gentoo
sys-kernel/linux-headers:  6.6::gentoo (virtual/os-headers)
sys-libs/glibc:            2.38-r10::gentoo
Repositories:

gentoo
    location: /var/db/repos/gentoo
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    volatile: False
    sync-rsync-verify-metamanifest: yes
    sync-rsync-extra-opts: 
    sync-rsync-verify-max-age: 24
    sync-rsync-verify-jobs: 1

avr
    location: /usr/local/avr
    masters: gentoo
    priority: 0
    volatile: True

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=alderlake -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=alderlake -O2 -pipe"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME"
FCFLAGS="-march=alderlake -O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live candy config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=alderlake -O2 -pipe"
GENTOO_MIRRORS="https://gentoo.osuosl.org/ https://mirrors.rit.edu/gentoo/ http://gentoo.mirrors.tds.net/gentoo"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LEX="flex"
LINGUAS="en cs es"
MAKEOPTS="-j16"
PKGDIR="/var/cache/binpkgs"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
SHELL="/bin/bash"
USE="X a52 aac acl acpi alsa amd64 bluetooth branding bzip2 cairo cdda cdr cli crypt cups dbus dri dts dvd dvdr elogind emacs encode exif flac foomaticdb fortran gdbm gif gpm gtk gui iconv icu imagemagick jpeg latex lcms libnotify libtirpc lock mad mng mp3 mp4 mpeg multilib ncurses nls ogg opengl openmp pam pango pcre pdf pic png policykit ppds pulseaudio qt5 readline sasl sdl seccomp sound spell split-usr ssl startup-notification svg test-rust thunar tiff truetype udev udisks unicode upower usb vorbis vulkan wxwidgets x264 xattr xcb xft xml xscreensaver xv xvid zlib" ABI_X86="64" ADA_TARGET="gcc_12" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt rdrand sha sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 ntrip navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" INPUT_DEVICES="evdev synaptics wacom" KERNEL="linux" L10N="en cs es" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-1" POSTGRES_TARGETS="postgres15" PYTHON_SINGLE_TARGET="python3_11" PYTHON_TARGETS="python3_11" RUBY_TARGETS="ruby31" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto logmark ipmark dhcpmac delude chaos account"
Unset:  ADDR2LINE, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EMERGE_DEFAULT_OPTS, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LD, LFLAGS, LIBTOOL, MAKE, MAKEFLAGS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PYTHONPATH, RANLIB, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS

--------

# lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda           8:0    0 931.5G  0 disk 
├─sda1        8:1    0   931G  0 part 
└─sda2        8:2    0   523M  0 part 
nvme0n1     259:0    0   1.9T  0 disk 
└─nvme0n1p1 259:5    0   1.9T  0 part /home
nvme1n1     259:1    0   1.9T  0 disk 
├─nvme1n1p1 259:2    0   256M  0 part /boot
├─nvme1n1p2 259:3    0   256G  0 part [SWAP]
├─nvme1n1p3 259:4    0   256G  0 part /
└─nvme1n1p4 259:6    0   1.4T  0 part /home/family

-----------

# blkid
/dev/nvme0n1p1: LABEL="Home" UUID="8eacacc7-41b7-4d3e-96bb-6ad364693e2e" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Home" PARTUUID="933ac7e1-2eb4-4f13-b844-0e14e2aef915"
/dev/nvme1n1p4: LABEL="Family" UUID="5cb2e862-5d29-4faf-a2c5-fa74aafe891a" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Family" PARTUUID="716bb614-cf65-fd46-8012-64377d3b231c"
/dev/nvme1n1p2: UUID="100e8758-6ce7-4357-9f1c-6bec5b67833a" TYPE="swap" PARTLABEL="Swap" PARTUUID="0657fd6d-a4ab-43c4-84e5-0933c84b4f4f"
/dev/nvme1n1p3: LABEL="Root" UUID="482509d9-6a9b-435f-af9f-50ff80991d87" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Root" PARTUUID="4f68bce3-e8cd-4db1-96e7-fbcaf984b709"
/dev/nvme1n1p1: LABEL_FATBOOT="EFI" LABEL="EFI" UUID="CA86-8059" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="Efi" PARTUUID="c12a7328-f81f-11d2-ba4b-00a0c93ec93b"
/dev/sda2: BLOCK_SIZE="512" UUID="C2486E15486E090D" TYPE="ntfs" PARTUUID="2e68f7af-02"
/dev/sda1: BLOCK_SIZE="512" UUID="5C7E44C97E449DA0" TYPE="ntfs" PARTUUID="2e68f7af-01"



Reproducible: Always
Comment 1 Mike Gilbert gentoo-dev 2024-03-23 18:16:51 UTC
I suspect that PARTUUID=716bb614-cf65-fd46-8012-64377d3b231c is actually just an empty filesystem since you have been mounting PARTUUID=933ac7e1-2eb4-4f13-b844-0e14e2aef915 on top of it for a while.

I would suggest the following to resolve it.

1. Mount PARTUUID=933ac7e1-2eb4-4f13-b844-0e14e2aef915 at /home.
2. Mount PARTUUID=716bb614-cf65-fd46-8012-64377d3b231c at /mnt/family.
3. Copy the contents of /home/family to /mnt/family.
4. Unmount /mnt/family.
5. Remove the contents of /home/family.
6. Mount PARTUUID=716bb614-cf65-fd46-8012-64377d3b231c at /home/family.
Comment 2 Jan Hrabe 2024-03-23 19:46:40 UTC
Yes, that's correct, I should have noticed the missing /home/family/lost+found.  Thank you.