mountall deadlocks with bind mounts below nfs mounts

This is a bit speculative, as I need these VMs working again quickly so I'm bludgeoning around the issue rather than debugging it, but:

# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda1 during installation
LABEL=root / ext4 errors=remount-ro 0 1
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
hg.build.lal.cisco.com:/data/tools /mnt/tools nfs ro,exec 0 0
tmpfs /chroots/squeeze/i386/tmp tmpfs size=100M 0 0
/mnt/tools /chroots/squeeze/x86_64/mnt/tools auto rbind 0 0
/ram-work /chroots/squeeze/x86_64/ram-work auto rbind 0 0
/proc /chroots/squeeze/i386/proc auto rbind 0 0
/proc /chroots/squeeze/x86_64/proc auto rbind 0 0
/ram-hg /chroots/squeeze/x86_64/ram-hg auto rbind 0 0
/dev /chroots/squeeze/i386/dev auto rbind 0 0
/dev /chroots/squeeze/x86_64/dev auto rbind 0 0
/mnt/tools /chroots/squeeze/i386/mnt/tools auto rbind 0 0
scratch:/chroots /chroots nfs ro,exec 0 0
/scratch /chroots/squeeze/x86_64/scratch auto rbind 0 0
/scratch /chroots/squeeze/i386/scratch auto rbind 0 0
tmpfs /chroots/squeeze/x86_64/tmp tmpfs size=100M 0 0
/ram-hg /chroots/squeeze/i386/ram-hg auto rbind 0 0
/ram-work /chroots/squeeze/i386/ram-work auto rbind 0 0
scratch:/scratch /scratch nfs rw,exec,noatime 0 0

/chroots is nfs-mounted so comes up as a network filesystem.
/chroots/squeeze/i386/proc and friends are considered to be local filesystems
mountall sits around waiting for the bind mounts before it says local filesystems are finished
The bind mounts can't be mounted without /chroots because their mount point doesn't exist
upstart never brings up the network because it's waiting for the local filesystems

Adding nobootwait to all the bind and tmpfs mounts makes it come up cleanly.

I think the problem is that mount points below a network mount point need to be treated as network filesystems, not local ones.

Has anybody ever mentioned that a fragile daemon to mount filesystems that blocks the entire boot process is a bad idea?