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CPUFan
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Joined: 21 May 2015
Posts: 58
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 Posted: Wed Dec 27, 2017 1:09 pm Post subject: root dir is readonly, fstab ignored? [solved] |
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Hello,
I made a fresh Gentoo install on my laptop. Almost everything works, except for my root directory being mounted read-only (and others not being mounted at all).
What I've tried/checked:
- The UUIDs and PARTUUIDs all match
- Using sda's in the fstab does not do any difference
- /etc/rc.conf has not been altered except that I set RC_PARALLEL to "no"
- Using rc-status in the system rescue CD, I get tons of errors of the kind "mkdir '/run/openrc/starting': No such file or directory'". "/run" does exist, but /run/openrc points to /lib64/rc/init.d, but there is no init.d directory in "/lib64/rc". Maybe this simply doesn't work from a live CD?
- After boot, "/etc/inid.t/root status" says "status: stopped"
- At https://forums.gentoo.org/viewtopic-t-1019602-start-0.html , they solved it by enabling "CONFIG_FILE_LOCKING". I really don't know what it does. Should I try it?
Can someone please give some hints? Below is some data.
Kind regards,
Johannes
---- >8 ----
Some generic info:
- The hard disk is an SSD
- UEFI+gpt are being used
- No LVM/DM/encryption/etc.
boot entry:
| Code: |
...
linux /vmlinuz-4.14.8-gentoo-r1 root=PARTUUID=9f75afba-7b9f-4fcd-8efd-bf17c9a29b03 ro
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/etc/fstab:
| Code: |
tmpfs /tmp tmpfs defaults,size=6G 0 0
UUID=FE65-DE9E /boot vfat rw 0 2
UUID=3aac3302-c512-438a-a3fb-2ea3ab7c932c / ext4 acl,user_xattr,noatime,discard 1 1
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Log directly after boot prompt (no LiveCD involved):
| Code: |
$ runlevel
unknown
$ blkid
/dev/sda1: UUID="FE65-DE9E" TYPE="vfat"
/dev/sda2: UUID="3aac3302-c512-438a-a3fb-2ea3ab7c932c" TYPE="ext4"
$ lsblk
lsblk: failed to access sysfs directory: /sys/dev/block: No such file or directory
$ ls -a /sys
. .. .keep
$ mount
/dev/root on / type ext4 (ro,relatime,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=...k,nr_inodes=...,mode=755)
proc on /proc type proc (rw,nosuid, nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nodev,relatime,size=...,mode=755)
$ mount -a
[314....] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
$ mount
# the same output, plus two new partitions (but root is still mounted ro)
tmpfs on /tmp type tmpfs (rw,relatime,size=...)
/dev/sda1 on /boot type vfat (rw,....,errors=remount-ro)
$ mount -o remount,rw /
[439...] EXT4-fs (sda2): re-mounted. Opts: acl,user_xattr,discard # these options indeed match the fstab
$ mount
# the same output, but /dev/root has changed options, including rw:
/dev/root on / type ext4 (rw,noatime,discard,data=ordered)
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dmesg: https://paste.pound-python.org/show/wQWUZWbGxLapETkXXZhp/
kernel config: https://paste.pound-python.org/show/SbB5DnNJ7beVllZywNt0/
Last edited by CPUFan on Thu Dec 28, 2017 9:44 am; edited 2 times in total |
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charles17
Advocate
Joined: 02 Mar 2008
Posts: 3684
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| Posted: Wed Dec 27, 2017 1:38 pm Post subject: |
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| Does it boot using boot option 5) of system rescue cd? |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Wed Dec 27, 2017 1:56 pm Post subject: |
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CPUFan,
| Code: | | lsblk: failed to access sysfs directory: /sys/dev/block: No such file or directory |
Under the same test conditions does /sys exist?
Is there anything in /sys ?
Is your kernel set up to provide /sys?
| Code: | $ grep SYSFS /usr/src/linux/.config
...
CONFIG_SYSFS=y
... |
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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CPUFan
n00b
Joined: 21 May 2015
Posts: 58
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| Posted: Wed Dec 27, 2017 2:09 pm Post subject: |
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Thanks for your quick answers.
| charles17 wrote: |
Does it boot using boot option 5) of system rescue cd?
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No. Strangely, booting from hard disk in the rescue CD's menu takes 7 seconds and then still boots from the live disk (I think it's the live disk booted, since it asks for a keymap). It then fails "/sbin/init is not found on root filesystem". However, booting the rescue CD directly works without this error.
| NeddySeagoon wrote: | Under the same test conditions does /sys exist?
Is there anything in /sys ?
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It exists, but there's only ".keep" in it, nothing else. (fyi, it's booted normally, i.e. without live CD)
| NeddySeagoon wrote: | | Is your kernel set up to provide /sys? |
Yes, it's set to "y".
I'm adding the kernel config to the original post now, just in case it's a kernel issue. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Wed Dec 27, 2017 2:23 pm Post subject: |
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CPUFan,
What do you have in /etc/runlevels/sysinit/ ?
| Code: | $ ls /etc/runlevels/sysinit/
devfs dmesg sysfs tmpfiles.dev |
The sysfs entry mounts /sys.
Its a symlink sysfs -> /etc/init.d/sysfs
make it by hand from a livecd if its missing.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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CPUFan
n00b
Joined: 21 May 2015
Posts: 58
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| Posted: Wed Dec 27, 2017 2:31 pm Post subject: |
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| NeddySeagoon wrote: | | What do you have in /etc/runlevels/sysinit/ ? |
Sysfs is there and linking to /etc/init.d/sysfs (like in your case).
| Code: | $ ls /etc/runlevels/sysinit
devfs dmesg kmod-static-nodes sysfs udev udev-trigger |
They all link to /etc/init.d scripts with the same name. The only one you have and I don't have is tmpfiles.dev. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Wed Dec 27, 2017 2:50 pm Post subject: |
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CPUFan,
Thats OK. I don't use udev, so don't have udev and udev-trigger.
tmpfiles.dev has been removed in a more recent version of openrc that I have.
Lets try a manual mount of /sys.
| Code: | | mount -t sysfs sys /sys |
I hope it doesn't work and provides an interesting error message instead.
Check the content of /sys and the end of dmesg
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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CPUFan
n00b
Joined: 21 May 2015
Posts: 58
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| Posted: Wed Dec 27, 2017 3:08 pm Post subject: |
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NeddySeagoon,
I'm in non-live-boot, i.e. boot from hard disk:
| Code: | $ ls -a /sys
. .. .keep
$ mount -t sysfs sys /sys
$ ls -a /sys
. .. block bus class dev devices firmware fs kernel module power
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So, no error output from mount. dmesg is silent, too.
Btw, isn't mounting "/sys" done by the "root" job? The root job is "stopped" for some reasons. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Wed Dec 27, 2017 3:57 pm Post subject: |
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CPUFan,
/sysfs is mounted by /etc/init.d/sysfs which is in your sysinit runlevel.
It should be on the boot screen with the Mounting /proc message.
Its is the first handful of messages as OpenRC starts.
Is it there at all?
Do you see a [!!] or an [ok] after it?
My version of /etc/init.d/sysfs shows that it does not depend on anything.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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CPUFan
n00b
Joined: 21 May 2015
Posts: 58
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| Posted: Wed Dec 27, 2017 5:08 pm Post subject: |
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| NeddySeagoon wrote: |
Is it there at all?
Do you see a [!!] or an [ok] after it?
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I could see that it did mount /proc and /run, like the live CD, but then, opposed to the live cd, not /sys (which should be next). Instead, it shows something red and immediatelly jumps to the root login.
Booting from my hard disc drive in recovery mode, I get errors on boot (right before it should mount the sysfs), that the "flock" system call was not available. So, following https://forums.gentoo.org/viewtopic-t-1019602-start-0.html, I enable CONFIG_FILE_LOCKING, and ...
... it worked!
I really wonder why this was disabled. Moving my .config away and typing make defconfig generates a new .config with having it set to 'Y'. I could swear I never touched this option.
Maybe CONFIG_FILE_LOCKING did get disabled by enabling another option? At least, I can not see that any option can disable CONFIG_FILE_LOCKING, but my kernel config knowledge is just basic. |
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CPUFan
n00b
Joined: 21 May 2015
Posts: 58
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| Posted: Thu Dec 28, 2017 9:45 am Post subject: |
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Sorry, I forgot marking this as solved.
Thanks everyone for the help! |
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