I have created LFS 7.2 using the book, and it successfully boots up, but when I try to create a new file or directory, I cannot, while it says that my file system is read-only. Although I can list the files and directories, change the directory or so. How can I overcome this? Below you can find the last few lines while my LFS system is booting up:

EXT3-fs (sda6): mounted filesystem with writeback data mode
VFS: Mounted root (ext3 filesystem) readonly on device 8:6.
Freeing unused kernel memory: 452k freed
Write protecting the kernel text: 7812k
Write protecting the read-only data: 2344k
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-4.2#

And for example, if I try to create a new directory I get the following error message:

bash-4.2# mkdir test
mkdir: cannot create directory 'test': Read-only file system

For your knowledge, I have created my kernel using "make defconfig" command, and just did a few small changes to the default configuration. I'm using ext3 file system, mounted in /dev/sda6. Also in my /etc/fstab I have the following line:

/dev/sda6 /mnt/lfs ext3 defaults 1 1

If you could help me overcome the problem, I would be glad.

That doesn't look correct. There is no /mnt/lfs when you boot into lfs.

It should be: (mentioned here)

That's the /etc/fstab of my host machine. In my LFS system's /etc/fstab file it is exactly as you have provided. I will try to delete that line from my host machine's /etc/fstab, and try to boot like that, but I don't know whether whether it will boot, whether it will be able to find my kernel. Because if my mount my /mnt/lfs just using the mount command from my host machine, it won't be there when I restart my PC, so I don't know whether it will find the kernel.

No need to tinker with your host at this point. The problem is lfs related.

I personally think you are missing some kernel options based on this: [SOLVED] LFS: Error during Linux-3.5.2 kernel compilation and this: We might be able to point you in the right direction if you post more of the boot messages (as much as possible up to the read-only prompt).

BTW: Have you seen this post: [SOLVED] Booting stops after kernel starts. Related and also mentions a kernel option.

EDIT: Are you 100% sure that this kernel option is set: Maintain a devtmpfs filesystem to mount at /dev (mentioned in the LFS book and not set by make defconfig)

I checked that Booting stops after kernel starts thread, but I couldn't find something useful for me. I'm sure that devtmpfs filesystem is mainted. Can the fact that I have in my host /etc/fstab used my /mnt/lfs as a mount point cause the problem?

Not if you are talking about your hosts fstab file. As stated before: No need to tinker with your host at this point. The problem is lfs related.

This is my host /etc/fstab:

And this is my LFS /etc/fstab

(of course both with spacing, I don't know why I cannot get the spacings here)
I don't know what it can be LFS related, maybe something in the kernel, but I don't know how can I show you the full kernel booting log.

This question is still unanswered: Can you also post the output of the following commands (from your host, lfs mounted under /mnt/lfs):

Output of "ls -l /mnt/lfs/dev/{console,null} :

Output of "grep CONFIG_DEVTMPFS /mnt/lfs/boot/config-3.5.2 :

You are wrong. Maintain a devtmpfs filesystem to mount at /dev is _not_ set.

As long as I remember, when I made "make defconfig", I then did "make menuconfig", loaded the default config, and checked that options, but I will try to do it again, and tell you the result.

I might have jumped the gun......

CONFIG_DEVTMPFS=y --> Maintain a devtmpfs filesystem to mount at /dev is set (sorry about that!!)
CONFIG_DEVTMPFS_MOUNT --> is not set.

Try setting the CONFIG_DEVTMPFS_MOUNT

Also: what does your /mnt/lfs/etc/inittab look like?

Now the output of "grep CONFIG_DEVTMPFS /mnt/lfs/boot/config-3.5.2" looks like:

And /mnt/lfs/etc/inittab looks like this:

The inittab file looks OK.

Guess you are ready to reboot again (you did compile/place the kernel and not just set the option using make menuconfig as described in 8.3.1??)

I edited the kernel config file to make CONFIG_DEVTMPFS_MOUNT=y and then recompiled and placed everything where they belong. But again I cannot create file or directory. Still seeing the error message, regarding read-only file system. :/