* I suppose due to keeping the root fs readonly the entire boot is a tad faster and thus exposes the race.
* Due to that race it is recommended that physical interfaces use 'allow-hotplug', and virtual interfaces (bridges etc) use 'auto'.
* debian-installer uses allow-hotplug for writing /etc/network/interfaces, to cope with slow detection on the kernel side
However, it also doesn't work with allow-hotplug, I'll investigate further.
I talked to Michael Biebl, some notes:
* I suppose due to keeping the root fs readonly the entire boot is a tad faster and thus exposes the race. interfaces, to cope with slow detection on the kernel side
* Due to that race it is recommended that physical interfaces use 'allow-hotplug', and virtual interfaces (bridges etc) use 'auto'.
* debian-installer uses allow-hotplug for writing /etc/network/
However, it also doesn't work with allow-hotplug, I'll investigate further.