Debugging notes:

       name = udev_device_get_sysname(parent);
        if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
                return NULL;

This works fine, host is "10" in the scsi_debug case above.

But then the code below which does "Rebase host offset to get the local
relative number" turns host into a "0" as 10 is the smallest host number
on that device. This code is a bit dubious to me, I'll ask Kay.

** Summary changed:

- /dev/disk/by-path link for scsi disks always has host "0", causing conflicts
+ [udev] /dev/disk/by-path link for scsi disks always has host "0", causing 
conflicts

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https://bugs.launchpad.net/bugs/1321816

Title:
  [udev] /dev/disk/by-path link for scsi disks always has host "0",
  causing conflicts

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