DF2807 opened /dev/udev fd=3
DF2807 initiation read rv=-1 errno=35 (35/EAGAIN expected)
DF2807 short read(1B)         rv=-1 errno=12
DF2807 full read #1           rv=824 errno=0
DF2807 first surviving event name="vn0s0" (vn0 = e1 kept -> patched; anything else -> e1 DROPPED)
DF2807 full read #2           rv=765 errno=0
# read #1 event: <name>vn0s0</name> slice-create (2nd generated event)
# read #2 event: <name>h41</name> create (3rd generated event)
# the FIRST generated event (vn0 disk CREATE) never appears: consumed by the 1-byte read