I have a similar problem, Ubuntu 12.04, mountall 2.36.4. I have a file-
system (/data) with 44 sqfs-images and the mountpoints for them.

In the fstab I mount first the filesystem 
/dev/vg2/datalv /data ext4 noatime 0 2

and later the images
/data/sqfs/xxxxx01.sqfs /data/xxxxx/xxxxx/xxxxx01 squashfs,ro loop 0 0
...
/data/sqfs/xxxxx44.sqfs /data/xxxxx/xxxxx/xxxxx44 squashfs,ro loop 0 0

I could reproduce the infinite running mountall with 100% CPU usage on
about 2 out of 3 bootings.

The problem seems to go away after changing all lines in fstab containing sqfs 
to 
/data/sqfs/xxxxx01.sqfs /data/xxxxx/xxxxx/xxxxx01 squashfs,ro,_netdev loop 0 0
(adding "_netdev", probably impossible workaround on a mobile computer)

So maybe mountall goes into the infinite loop while waiting on the availbility 
of the image-files, (*.iso or *.sqfs)?
I did not find any other option to make mount wait onto an other fs like 
waiting on the network.

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https://bugs.launchpad.net/bugs/1087951

Title:
  mountall 100% cpu ussage

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