Somebody else showed up on IRC with similar symptoms, so I've been
making progress on this.  So far, I've found three underlying problems:

 * initramfs-tools' configure_networking function is hardcoded (by means of 
/etc/initramfs-tools/initramfs.conf) to default to bringing up eth0.  
partman-iscsi needs to remember which device was configured in netcfg, and 
open-iscsi needs to make use of that in its initramfs script.
 * /etc/udev/rules.d/70-persistent-net.rules is not copied into the initramfs, 
so network device order in the initramfs is not deterministic.  I'm not sure 
right now whether to do that in open-iscsi or centrally in udev, given that a 
similar problem is likely to afflict NFS-root and NBD-root cases.

** Changed in: partman-iscsi (Ubuntu)
   Importance: Undecided => High

** Changed in: partman-iscsi (Ubuntu)
       Status: Incomplete => In Progress

** Changed in: partman-iscsi (Ubuntu)
     Assignee: (unassigned) => Colin Watson (cjwatson)

** Also affects: open-iscsi (Ubuntu)
   Importance: Undecided
       Status: New

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iscsi-root install  will only use net0 for iscsi-target connectivity
https://bugs.launchpad.net/bugs/473036
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