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Bug 673920 - sys-fs/mdadm-4.0 with sys-kernel/vanilla-sources-4.19.11 constantly changes names of raid devices
Summary: sys-fs/mdadm-4.0 with sys-kernel/vanilla-sources-4.19.11 constantly changes n...
Status: RESOLVED CANTFIX
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo's Team for Core System packages
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-12-28 21:01 UTC by Juergen Rose
Modified: 2019-11-25 16:11 UTC (History)
0 users

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


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Description Juergen Rose 2018-12-28 21:01:45 UTC
During the last days the names of my raid devices are continously exchanging. This results in difficulties of mounting my /boot partition.
For years I had in my fstab:

/dev/md125      /boot             ext2     noauto,noatime     1 2

Corresponding to 'cat /proc/mdstat' /dev/md125 was raid1 sdb1[0] sdc1[1]
Some days ago I found that the raid consisting of sdb1[0] sdc1[1] has now the name /dev/md126.

At 
https://serverfault.com/questions/494569/mdadm-raid-device-name-changed-on-reboot I found, that I should not use the /dev/mdXZY device names but the /dev/md/XYZ devices names.

/dev/md/125_0 pointed to /dev/md126. So I used /dev/md/125_0 in /etc/fstab. One day later the names changed again.

root@cheetahnew:/usr/src/linux(26)# cat /proc/mdstat 
Personalities : [raid1] [raid6] [raid5] [raid4] [raid10] [multipath] 
md125 : active raid1 sdb6[1] sda6[0]
      1789653968 blocks super 1.2 [2/2] [UU]
md126 : active raid1 sdb3[1] sda3[0]
      138411968 blocks [2/2] [UU]
md127 : active (auto-read-only) raid1 sdb1[1] sda1[0]
      262080 blocks [2/2] [UU]

root@cheetahnew:/usr/src/linux(25)# ll /dev/md/
total 0
lrwxrwxrwx 1 root root 8 Dec 19 18:38 126_0 -> ../md127
lrwxrwxrwx 1 root root 8 Dec 19 18:38 127_0 -> ../md126
lrwxrwxrwx 1 root root 8 Dec 19 18:38 sysresccd:2 -> ../md125


I.e., /dev/md127 = /dev/md/126_0 is now my boot partition.


Today I see, the following:

rose@cheetahnew:/home/rose(5)$ cat /proc/mdstat 
Personalities : [raid1] [raid6] [raid5] [raid4] [raid10] [multipath] 
md125 : active raid1 sda6[0] sdb6[1]
      1789653968 blocks super 1.2 [2/2] [UU]
md126 : active (auto-read-only) raid1 sda1[0] sdb1[1]
      262080 blocks [2/2] [UU]      
md127 : active raid1 sdb3[1] sda3[0]
      138411968 blocks [2/2] [UU]
...
rose@cheetahnew:/home/rose(6)$ ll /dev/md/
total 0
lrwxrwxrwx 1 root root 8 Dec 20 16:47 126_0 -> ../md127
lrwxrwxrwx 1 root root 8 Dec 20 16:48 127_0 -> ../md126
lrwxrwxrwx 1 root root 8 Dec 20 16:47 sysresccd:2 -> ../md125

rose@cheetahnew:/home/rose(7)$ ll /dev/disk/by-uuid/ | grep md
lrwxrwxrwx 1 root root 11 Dec 20 16:48 b0b8091a-1b07-42a1-8548-1348c86847fa -> ../../md126
lrwxrwxrwx 1 root root 11 Dec 20 16:47 ea11d5e3-e919-439f-a149-19d31c25000f -> ../../md127

I.e., /dev/md126 = /dev/md/127_0 = /dev/disk/by-uuid/b0b8091a-1b07-42a1-8548-1348c86847fa
is now the boot device, the /dev/mdXYX name and the /dev/md/XYZ name changed after rebooting.

I will try now to use the line 
UUID=b0b8091a-1b07-42a1-8548-1348c86847fa /boot                                   ext2 noauto,noatime 1 2

in /etc/fstab. I hope, that this is the right UUID, because I see a second from mdadm:
rose@cheetahnew:/home/rose(9)$ sudo mdadm --detail --scan
Password: 
ARRAY /dev/md/126_0 metadata=0.90 UUID=c5ec9071:452f9da5:c44c77eb:7ee19756
ARRAY /dev/md/127_0 metadata=0.90 UUID=b7bff995:4d77ef32:c44c77eb:7ee19756
ARRAY /dev/md/sysresccd:2 metadata=1.2 name=sysresccd:2 UUID=f6283ba7:7673cbf4:1cd4b0f6:2f75d271

Corresponding to the yesterday output from 'mdadm --detail --scan' I inserted yesterday the following lines to /etc/mdadm.conf:

rose@cheetahnew:/home/rose(10)$ grep ^ARRAY /etc/mdadm.conf
ARRAY /dev/md/126_0 metadata=0.90 UUID=b7bff995:4d77ef32:c44c77eb:7ee19756
ARRAY /dev/md/127_0 metadata=0.90 UUID=c5ec9071:452f9da5:c44c77eb:7ee19756
ARRAY /dev/md/sysresccd:2 metadata=1.2 name=sysresccd:2 UUID=f6283ba7:7673cbf4:1cd4b0f6:2f75d271

It looks, if these lines are ignored.


root@cheetahnew:/root(8)# emerge --info mdadm
Portage 2.3.53 (python 3.6.6-final-0, default/linux/amd64/17.0, gcc-8.2.0, glibc-2.28-r4, 4.19.11 x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Linux-4.19.11-x86_64-Intel-R-_Core-TM-_i3-2120_CPU_@_3.30GHz-with-gentoo-2.6
KiB Mem:     7852948 total,    661748 free
KiB Swap:   50331640 total,  49902584 free
Timestamp of repository gentoo: Fri, 28 Dec 2018 17:00:01 +0000
Head commit of repository gentoo: 802021a945e43c9400779336b0f6d4c0b245531e
sh bash 4.4_p23
ld GNU ld (Gentoo 2.31.1 p5) 2.31.1
distcc[21216] (dcc_trace_version) distcc 3.3.2 x86_64-pc-linux-gnu; built Dec 10 2018 06:20:50 [disabled]
app-shells/bash:          4.4_p23::gentoo
dev-java/java-config:     2.2.0-r4::gentoo
dev-lang/perl:            5.26.2::gentoo
dev-lang/python:          2.7.15-r100::sage-on-gentoo, 3.6.6::gentoo, 3.7.0::gentoo
dev-util/cmake:           3.11.4-r1::gentoo
dev-util/pkgconfig:       0.29.2::gentoo
sys-apps/baselayout:      2.6-r1::gentoo
sys-apps/sandbox:         2.14::gentoo
sys-devel/autoconf:       2.13-r1::gentoo, 2.69-r4::gentoo
sys-devel/automake:       1.11.6-r3::gentoo, 1.15.1-r2::gentoo, 1.16.1-r1::gentoo
sys-devel/binutils:       2.31.1-r3::gentoo
sys-devel/gcc:            8.2.0-r6::gentoo
sys-devel/gcc-config:     2.0::gentoo
sys-devel/libtool:        2.4.6-r5::gentoo
sys-devel/make:           4.2.1-r4::gentoo
sys-kernel/linux-headers: 4.20::gentoo (virtual/os-headers)
sys-libs/glibc:           2.28-r4::gentoo
Repositories:

gentoo
    location: /usr/portage_cheetahnew
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    sync-rsync-verify-metamanifest: yes
    sync-rsync-extra-opts: 
    sync-rsync-verify-jobs: 1
    sync-rsync-verify-max-age: 24
...

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA PUEL Intel-SDP dlj-1.1 skype-eula skype-4.0.0.7-copyright googleearth AdobeFlash-11.x cadsoft Oracle-BCLA-JavaSE MakeMKV-EULA NVIDIA-CUDA Nero-AAC-EULA GIMPS"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /etc/stunnel/stunnel.conf /usr/lib64/libreoffice/program/sofficerc /usr/share/config /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/php/apache2-php7.2/ext-active/ /etc/php/cgi-php7.2/ext-active/ /etc/php/cli-php7.2/ext-active/ /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=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs clean-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="de en fr ru"
MAKEOPTS="-j5"
PKGDIR="/usr/portage/packages"
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"
USE="64bit R X Xaw3d a52 aac acl acpi admin afs alsa amd64 amr ao apache2 apng applet archive armadillo arpack asf aspell assistant atlas audacious audiofile aufs automap automount barcode bash-completion berkdb blas blast bluetooth bluray boost btrfs bzip2 cairo cdda cddb cdf cdio cdparanoia cdr cgi chm cilk clang cli cmake collada contrib crypt css cups curl cxx daap db dbi dbm dbus declarative designer devhelp device-mapper dga dia digitalradio djvu doc dot dri ds2490 ds9097 ds9097u dts dv dvb dvd dvdr dvi dynamicplugin eds egl elf emacs emboss emf encode epiphany evdev evo examples excel exif expat extensions extra extras faac faad ffmpeg fftw firefox fits flac fltk fontconfig foomaticdb fortran fortran95 fpm fpx ftp fuse gcj gd gdal gdbm gedit geoip geolocation geos gfortran gif gimp git glade glamor glib glpk gml gmp gnome gnome-keyring gnuplot gnutls gold gphoto2 gpm grammar graphics graphtft graphviz grass gsl gstreamer gtk gtk3 gudev guile hddtemp hdf hdf5 hdri html http httpd hvm hwdb iconv icq icu id3tag ide imagemagick imap inotify introspection ipod ipv6 ithreads jadetex java jbig jit john jpeg jpeg2k kate kdepim kdrive kerberos keymap kpathsea kvm ladspa lame lapack latex lcms ldap lensfun libffi libgda libkms libnotify libsamplerate libtirpc live lm_sensors lua lzma lzo mad mail maildir mapnik math matroska media-library mercurial mikmod mng mod mono motif mozilla mp3 mp4 mpeg mpi mpi-threads mplayer mtp multilib multimedia musepack musicbrainz mysql mysqli nautilus ncurses netcdf netpbm network networking nfs nls nntp nptl nsplugin ntfs ntp numpy obex objc ocaml ocr octave odbc ofa ogdi ogg opencv openexr opengl openmp openvg pam pango pcre pda pdf pdl2 perl plasma plotutils plugins png podcast policykit portaudio posix postgres postscript ppds ppp preview-latex proj projectm pstricks pulseaudio python q32 qemu qhull qml qt5 quicktime raw readline reiserfs reports rle romio rpc rrdcgi rrdtool rtlsdr sage samba sasl schroedinger science sdk sdl seccomp secure-delete server session shout sip slang slp smart smbclient smp sms sndfile snmp soap sockets sound soup sox speex spell sql sqlite ssl stlport subtitles subversion sudo suexec svg svm swig systemd szip t1lib tbb tcl tcpd tex tex4ht theora thesaurus threads thunderbird tidy tiff tk tools truetype udev udisks unicode usb utempter v4l v4l2 vaapi vala valgrind vdpau video vim-syntax virt-network virtualbox visio vorbis vpx vtk wav wayland webdav webdav-serf webkit wmf wxwidgets x264 x265 xa xattr xcb xen xetex xft xine xml xmlreader xmlrpc xpm xps xv xvid xvmc yaml youtube zlib zsh-completion zvbi" ABI_X86="64" ALSA_CARDS="hda-intel" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_core authn_dbm authn_default authn_file authz_core authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgid dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info lbmethod_byrequests log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif slotmem_shm so socache_shmcb speling status unique_id unixd userdir usertrack vhost_alias" APACHE2_MPMS="worker" CALLIGRA_FEATURES="karbon plan sheets stage words" CAMERAS="canon fuji ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog sensors thermal" CPU_FLAGS_X86="avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="aivdm ashtech earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 navcom ntrip oceanserver oncore rtcm104v2 rtcm104v3 sirf superstar2 tnt tripmate tsip ublox nmea0183 nmea2000 passthrough" GRUB_PLATFORMS="emu efi-64 pc xen" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" L10N="de en fr ru" LCD_DEVICES="cfontz framebuffer glcd hd44780 mtxorb ncurses X lcd2usb lcdlinux png usblcd SureElec" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LLVM_TARGETS="X86" NETBEANS_MODULES="apisupport cnd dlight enterprise ergonomics groovy gsf harness ide identity j2ee java mobility nb php profiler websvccommon xml" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6 php7-1" POSTGRES_TARGETS="postgres9_5 postgres10" PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python2_7 python3_6" QEMU_SOFTMMU_TARGETS="arm i386 x86_64" QEMU_USER_TARGETS="arm i386 x86_64" RUBY_TARGETS="ruby23 ruby24" USERLAND="GNU" VIDEO_CARDS="intel" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

=================================================================
                        Package Settings
=================================================================

sys-fs/mdadm-4.0::gentoo was built with the following:
USE="-static" ABI_X86="(64)"
Comment 1 Thomas Deutschmann (RETIRED) gentoo-dev 2019-11-25 16:11:31 UTC
How do you assemble your RAID? I see changing names when I switch the way how arrays get assembled. I.e. when relying on some auto-magic you can never be sure which device will appear first.

1) Use UUID in /etc/fstab to avoid all of this.

2) If you don't want to use UUID, make sure you use only mdadm to assemble RAID and make sure your mdadm.conf containing 

> ARRAY /dev/md/<your desired name> metadata=1.2...

is present when you assemble your RAID. This way, mdadm will apply set name from config.

Closing as CANTFIX because I am not aware of any behavior change causing this and there's nothing we can do about it.