Bug 419773 – early bind mounts are listed twice in the mount table

• Product: Gentoo Hosted Projects
• Status: UNCONFIRMED ---

[Description Andreas Plesch 2012-06-05 14:14:06 UTC]

A recent patch added proper bind mounts support to the initramfs:

https://bugs.gentoo.org/show_bug.cgi?id=418463

On my system fstab I have bind mounts into other filesystems for efficient use of a ssd, for example:

/dev/sda1               /disk/fels/d3   ext4            noatime         0 0
/disk/fels/d3/usr/lib64 /usr/lib64      none bind
..

where /dev/sda is the ssd.

I have lines in /etc/initramfs.mounts such as:

/disk/fels/d3
/usr/lib64
..

The initrd successfully mounts the first mountpoint under /newroot/disk/fels/d3.
After the patch, linuxrc works as expected on my system, eg. the bind mounts are also mounted early and udev can use them.

This bug is about the fact that I did notice that the mount table as produced with the mount command now lists the mount points with the bind mounts twice:

# mount

...
/dev/sda1 on /disk/fels/d3 type ext4 (rw,noatime,commit=0)
/dev/sda1 on /usr/x86_64-pc-linux-gnu type ext4 (ro,noatime,user_xattr,barrier=1)
/dev/sda1 on /usr/lib64 type ext4 (ro,noatime,user_xattr,barrier=1)
/dev/sda1 on /usr/lib32 type ext4 (ro,noatime,user_xattr,barrier=1)
/dev/sda1 on /usr/libexec type ext4 (ro,noatime,user_xattr,barrier=1)
/dev/sda1 on /usr/include type ext4 (ro,noatime,user_xattr,barrier=1)
...
/disk/fels/d3/usr/x86_64-pc-linux-gnu on /usr/x86_64-pc-linux-gnu type none (rw,bind,commit=0)
/disk/fels/d3/usr/lib64 on /usr/lib64 type none (rw,bind,commit=0)
/disk/fels/d3/usr/lib32 on /usr/lib32 type none (rw,bind,commit=0)
/disk/fels/d3/usr/libexec on /usr/libexec type none (rw,bind,commit=0)
/disk/fels/d3/usr/include on /usr/include type none (rw,bind,commit=0)

Without the initrd only the second set of mount points is listed.

But this does not seem to have a negative effect sofar. It just produces df output which lists the ssd as mounted multiple times. As this doubled listing is not occurring without the initrd, it probably is related to the remounting at the end of the initrd, and may or may not be genkernel related. Perhaps it is normal ?


Reproducible: Always

Steps to Reproduce:
1. Use patched genkernel on a system with bind mounts into /usr/foo to generate initrd; edit /etc/initramfs.mounts
2. reboot with initrd
3. observe output of mount command
Actual Results:  
mount points used for bind mounts are listed twice; one time as being used by the actual disk partition; the other time as being used by the bind-mounted directory

Expected Results:  
It would be expected that mount only lists the mount points as being used by the bind-mounted directory because that is the behavior without the initrd.

Portage 2.1.10.49 (default/linux/amd64/10.0/desktop, gcc-4.5.3, glibc-2.14.1-r3, 3.2.12-gentoo x86_64)
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System uname: Linux-3.2.12-gentoo-x86_64-AMD_Opteron-tm-_Processor_256-with-gentoo-2.1
Timestamp of tree: Wed, 30 May 2012 14:05:01 +0000
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sys-devel/autoconf:       2.13, 2.68
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