[SOLVED] util-linux causing read only /

Cdh · 2012-03-08 15:35:08

Anyone else having this problem?

After upgrading to testing after boot the root filesystem is readonly with arch init and with systemd...
That's happening for me since 1 or 2 days, maybe the problem was earlier too, don't really know.

Downgraded util-linux (and its dependency mkinitcpio, but not rebuilding the initramfs) to repo version and my / filesystem is rw again after boot...

I have not seen anything on the mailinglist...

Last edited by Cdh (2012-03-09 09:47:22)

falconindy · 2012-03-08 16:49:03

Zero info to go on here. No logs, no config files...

output of blkid, bootloader config and /etc/fstab all seem relevant. Probably 'systemctl --full --all -t mount' as well since you mention systemd.

Last edited by falconindy (2012-03-08 16:50:09)

Cdh · 2012-03-08 17:27:33

Sorry, I first wanted to check if I am the only one or if there are already hundreds of minions working on it.

Logs are complicated on a read only filesystem. Couldn't find anything in dmesg, it just seems that it wasn't remounted rw while booting for some reason.

Nothing fancy here, using the util-linux from core with the rest from testing:

/dev/sda1: UUID="1ec5d4eb-f2c2-445a-88bd-41b5717fab29" TYPE="ext4"
/dev/sda2: UUID="2e8619f0-1f4f-423b-8dd9-8cb1be8b6e2a" TYPE="ext4"

# 
# /etc/fstab: static file system information
#
# <file system>        <dir>         <type>    <options>          <dump> <pass>
none                   /dev/pts      devpts    defaults            0      0
none                   /dev/shm      tmpfs     defaults            0      0

/dev/cdrom /media/cdrom   auto    ro,user,noauto,unhide   0      0
/dev/dvd /media/dvd   auto    ro,user,noauto,unhide   0      0

#UUID=   swap   swap    defaults        0       0

UUID=83a138cd-f2a5-4bdc-bbce-fbc9b8b20212 / ext4 defaults,relatime,user_xattr 0 0
UUID="2e8619f0-1f4f-423b-8dd9-8cb1be8b6e2a"     /home/chris     ext4     defaults,relatime,user_xattr 0 0
/swapfile       swap    swap    defaults,noauto 0       0

none    /sys/kernel/debug        debugfs        auto    0        0
none    /proc/bus/usb   usbfs   auto,busgid=108,busmode=0775,devgid=108,devmode=0664    0       0

UNIT                          LOAD   ACTIVE   SUB     JOB DESCRIPTION
-.mount                       loaded active   mounted     /
dev-hugepages.mount           loaded active   mounted     Huge Pages File System
dev-mqueue.mount              loaded active   mounted     POSIX Message Queue File System
home-chris-.gvfs.mount        loaded active   mounted     /home/chris/.gvfs
home-chris.mount              loaded active   mounted     /home/chris
media-cdrom.mount             loaded inactive dead        /media/cdrom
media-dvd.mount               loaded inactive dead        /media/dvd
media.mount                   loaded active   mounted     Media Directory
proc-sys-fs-binfmt_misc.mount loaded inactive dead        Arbitrary Executable File Formats File System
sys-fs-fuse-connections.mount loaded active   mounted     FUSE Control File System
sys-kernel-config.mount       loaded inactive dead        Configuration File System
sys-kernel-debug.mount        loaded active   mounted     Debug File System
sys-kernel-security.mount     loaded active   mounted     Security File System
var-lock.mount                loaded inactive dead        Lock Directory
var-run.mount                 loaded inactive dead        Runtime Directory

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
JOB    = Pending job for the unit.

15 units listed.

I mentioned the inistscripts and systemd together because it seems not to be a problem in one of them (or in both of them...)

mount -o remount,rw /dev/sda1 /

Gives ma a rw system with testing util-linux with no problems at all...

Jristz · 2012-03-09 02:46:56

this happend to mee in a fresh install using a btrfs for / and /home
only ussing default,compress=lzo in fstab for the / and /home
i resolve this "temporaly" replacing default fo rw in fstab

you can try adding rw to the fstab and using ro in grub

note: this happend to me in a fresh install, and a fresh install using testing in installation

falconindy · 2012-03-09 03:15:01

If those first two drives are the only output of blkid, notice that your root device is NOT one of those partitions.

Cdh · 2012-03-09 08:09:36

That's... interesting. I haven't seen that the UUID does not match.

Now I'm wondering how arch ever knew to mount /dev/sda1 to / when booting...
The bootloader sets it correctly with root=/dev/disk/by-uuid/1ec5d4eb-f2c2-445a-88bd-41b5717fab29 but who remounts it rw?

I fixed the fstab entry and will try if it remounts to rw correctly, thanks for spotting that.

edit: It did fix my problem.
My guess: util-linux until now just remounted / rw on boot and now actually looks at the fstab.

Last edited by Cdh (2012-03-09 09:46:58)

falconindy · 2012-03-09 14:56:49

Cdh wrote:

That's... interesting. I haven't seen that the UUID does not match.
Now I'm wondering how arch ever knew to mount /dev/sda1 to / when booting...

Because it's the bootloader's job to define root and pass it along to the initramfs to actually mount. /etc/fstab isn't involved (how could it? root isn't mounted yet).

Cdh wrote:

The bootloader sets it correctly with root=/dev/disk/by-uuid/1ec5d4eb-f2c2-445a-88bd-41b5717fab29 but who remounts it rw?

/etc/rc.sysinit remounts root.

Arch Linux

#1 2012-03-08 15:35:08

[SOLVED] util-linux causing read only /

#2 2012-03-08 16:49:03

Re: [SOLVED] util-linux causing read only /

#3 2012-03-08 17:27:33

Re: [SOLVED] util-linux causing read only /

#4 2012-03-09 02:46:56

Re: [SOLVED] util-linux causing read only /

#5 2012-03-09 03:15:01

Re: [SOLVED] util-linux causing read only /

#6 2012-03-09 08:09:36

Re: [SOLVED] util-linux causing read only /

#7 2012-03-09 14:56:49

Re: [SOLVED] util-linux causing read only /

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