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it can't read them from the root filesystem
+
Problems (2)
+
+ Device discovery by kernel is asynchronous. But that's
+ why we have udev, right?
+
+
+ Unfortunately not everything needed for device setup is
+ or can be in udev hooks (e.g. cryptsetup requires interaction)
+
+
+ Lots of hacks used (while ... do sleep... done,
+ udevadm settle in too many places), and they still
+ sometimes fail
+ (#616689 and merged
+ bugs)
+
+
+ Ubuntu has a somewhat better approach but we still haven't merged
+ it back...
+
+
+ ...in fact, Debian and Ubuntu branches have been diverging for
+ about 5 years
+
+
+
+