I've got the same problem on current Debian wheezy. The containers
start fine on boot, but it's impossible to (re)start any container
later:
# lxc-start -n test
lxc-start: Invalid argument - pivot_root syscall failed
lxc-start: failed to setup pivot root
lxc-start: failed to set rootfs for 'test'
lxc-start: failed to setup the container
lxc-start: invalid sequence number 1. expected 2
lxc-start: failed to spawn 'test'
The failure happens in the call
pivot_root(".", path)
in conf.c:setup_rootfs_pivot_root, with the error message "Invalid
argument". `path' value is "/mnt/lxc/mnt", current directory is
"/mnt/lxc". This seems to be correct, or at least intended. The
directories in /mnt/lxc are mounted as follows:
/dev/mapper/raid10-root on /mnt/lxc type ext4
(rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,stripe=384,data=ordered)
none on /mnt/lxc/proc type proc (rw,relatime)
none on /mnt/lxc/dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
none on /mnt/lxc/tmp type tmpfs (rw,relatime,size=16384k)
udev on /mnt/lxc/dev/snd type devtmpfs
(rw,relatime,size=1861084k,nr_inodes=465271,mode=755)
devpts on /mnt/lxc/dev/console type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
devpts on /mnt/lxc/dev/tty1 type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
devpts on /mnt/lxc/dev/tty2 type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
(/dev/mapper/raid10-root is the root file system of the host.)
My container configuration entries are:
lxc.rootfs = /var/lib/vservers/test
lxc.rootfs.mount = /mnt/lxc
And the container fstab:
none /var/lib/vservers/test/proc proc defaults
0 0
none /var/lib/vservers/test/dev/pts devpts gid=5,mode=620
0 0
none /var/lib/vservers/test/tmp tmpfs size=16m,mode=1777
0 0
/dev/snd /var/lib/vservers/test/dev/snd none bind
0 0
I tried to test pivot_root from command line after an unsuccessful
container start:
# cd /mnt/lxc
# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin
selinux srv sys tmp usr var
# ls mnt
# pivot_root . /mnt/lxc/mnt
pivot_root: Invalid argument
I've no idea whether the pivot_root call should succeed or not under
these circumstances and why it succeeds on boot but doesn't succeed
later when lxc-start is invoked from a command line.
Does anybody know what can be wrong with the pivot_root call?
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